CN110376133B - Optical component for portable gas detector - Google Patents
Optical component for portable gas detector Download PDFInfo
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- CN110376133B CN110376133B CN201910682335.9A CN201910682335A CN110376133B CN 110376133 B CN110376133 B CN 110376133B CN 201910682335 A CN201910682335 A CN 201910682335A CN 110376133 B CN110376133 B CN 110376133B
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- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 108
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- 238000000034 method Methods 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
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Abstract
本发明适用于气体探测技术领域，提供一种便携式气体探测仪用光学组件。本发明实施例第一方面通过提供一种包括一个探测激光器、一个第一反射镜、一个滤光片和一个第一光探测器的便携式气体探测仪用光学组件，或者，提供一种包括一个探测激光器、一个滤光片、一个N焦点会聚透镜或一个N焦点凹面反射镜以及一个第一光探测器的便携式气体探测仪用光学组件，既可探测远距离处的气体，又可探测近距离处的气体，信噪比高且结构简单。
The present invention is applicable to the field of gas detection technology, and provides an optical component for a portable gas detector. In a first aspect of an embodiment of the present invention, an optical component for a portable gas detector is provided, which includes a detection laser, a first reflector, a filter, and a first light detector, or an optical component for a portable gas detector includes a detection laser, a filter, an N-focus converging lens or an N-focus concave reflector, and a first light detector. The optical component can detect gas at a long distance and at a short distance, has a high signal-to-noise ratio, and has a simple structure.
Description
Technical Field
The invention belongs to the technical field of gas detection, and particularly relates to an optical assembly for a portable gas detector.
Background
The gas detection technology is mainly applied to the fields of coal, petrochemical industry, electric power, metallurgy, municipal engineering and the like, which are likely to cause inflammable and explosive and pollution gas leakage and have great threat to the life and property safety and health of people. The existing gas detector can detect dangerous or polluted gases such as methane and the like in a long distance, but can not meet the requirements of measurable gas in long distance and short distance, high signal to noise ratio and simple structure.
Disclosure of Invention
In view of the above, the embodiment of the invention provides an optical component for a portable gas detector, which solves the problem that the existing gas detector cannot simultaneously meet the requirements of high gas and signal to noise ratio and simple structure at a measurable distance and a measurable close distance.
A first aspect of an embodiment of the present invention provides an optical assembly for a portable gas detector, comprising:
a detection laser for emitting a detection laser beam;
a first reflecting mirror for reflecting the detection laser beam to the region where the gas to be detected is located;
the optical filter is used for filtering stray light outside the detection laser beam reflected by the reflection point of the region where the gas to be detected is located;
a first photodetector for receiving and detecting the detection laser beam reflected by the reflection point;
The reflection surface of the first reflecting mirror faces the emergent surface of the detection laser and the region where the gas to be detected is located, the first reflecting mirror is arranged on the incidence surface or the emergent surface of the optical filter, and the incidence surface of the optical filter faces the reflection point.
In one embodiment, the first reflecting mirror is arranged on the incident surface of the optical filter, and the first reflecting mirror is a total reflection triple prism;
or the first reflecting mirror is arranged on the emergent surface of the optical filter, and the first reflecting mirror is a total internal reflection triple prism.
In one embodiment, the portable gas detector optical assembly further comprises:
An indication laser for emitting a visible indication laser beam parallel to said detection laser beam;
The emergent surface of the indicating laser faces to the area where the gas to be detected is located.
In one embodiment, the first reflecting mirror is a transmission reflecting mirror, and is used for dividing the detection laser beam emitted by the detection laser into two beams;
The optical assembly for a portable gas detector further comprises:
a reference gas chamber sealed with a standard gas;
a second photodetector for receiving and detecting the detection laser beam transmitted inside the reference gas cell;
The reference air chamber is arranged on the opposite side of the emergent face of the detection laser, the second optical detector is arranged on one side, far away from the detection laser, of the reference air chamber, the detection laser beam is divided into two beams by the transmission reflector, one beam is transmitted to the region where the gas to be detected is located, and the other beam enters the reference air chamber.
In one embodiment, the portable gas detector optical assembly further comprises:
a converging lens for converging the detection laser beam reflected by the reflecting point to the incident surface of the first photodetector;
The incident surface of the first light detector faces to the emergent surface of the optical filter, and the converging lens is arranged between the emergent surface of the optical filter and the incident surface of the first light detector.
In one embodiment, the converging lens is an N-focus converging lens, and is configured to converge the N detection laser beams reflected by the N reflection points to an incident surface of the first photodetector;
the distances between the N reflection points and the N focus converging lenses are different, N is more than or equal to 2, and N is an integer.
In one embodiment, the portable gas detector optical assembly further comprises:
A concave reflector for converging the detection laser beam reflected by the reflecting point to the incident surface of the first photodetector;
The first reflecting mirror is arranged on the incidence surface of the optical filter, the first light detector is arranged on the emergence surface of the optical filter, and the reflecting surface of the concave reflecting mirror faces the incidence surface of the first light detector.
In one embodiment, the concave reflecting mirror is an N-focus concave reflecting mirror, and is configured to converge the N detection laser beams reflected by the N reflection points to an incident surface of the first photodetector;
The distances between the N reflecting points and the N focus concave reflecting mirrors are different, N is more than or equal to 2, and N is an integer.
In one embodiment, the portable gas detector optical assembly further comprises:
A concave mirror for converging the detection laser beam reflected back by the reflection point;
A second reflecting mirror for reflecting the detection laser beam converged by the concave reflecting mirror to the incident surface of the first detector;
The second reflecting mirror is arranged between the emergent surface of the optical filter and the reflecting surface of the concave reflecting mirror, and the reflecting surface of the second reflecting mirror faces the reflecting surface of the concave reflecting mirror and the incident surface of the first light detector.
A second aspect of an embodiment of the present invention provides an optical assembly for a portable gas detector, comprising:
a detection laser for emitting a detection laser beam;
The optical filter is used for filtering stray light outside the detection laser beams reflected by the N reflection points in the region where the gas to be detected is located;
a first photodetector for receiving and detecting the detection laser beam reflected by the reflection point;
An N focus converging lens or an N focus concave reflecting mirror for converging the N detection laser beams reflected by the N reflection points to the incident surface of the first photodetector;
The exit surface of the detection laser faces to the area where the gas to be detected is located, the incident surface of the optical filter faces to the reflection point, and the distances between the N reflection points and the N focus converging lens or the N focus concave reflecting mirror are different;
The incidence surface of the first light detector faces to the emergent surface of the optical filter, the N focus converging lens is arranged between the emergent surface of the optical filter and the incidence surface of the first light detector, or the first light detector is arranged on the emergent surface of the optical filter, and the reflecting surface of the N focus concave reflecting mirror faces to the incidence surface of the first light detector;
n is more than or equal to 2 and N is an integer.
According to the first aspect of the embodiment of the invention, the portable optical component for the gas detector comprises the detection laser, the first reflecting mirror, the optical filter and the first optical detector, the detection laser beam emitted by the detection laser is reflected to the region where the gas to be detected is located through the reflecting mirror, stray light outside the detection laser beam reflected by the reflecting point of the region where the gas is located is filtered through the optical filter, the detection laser beam reflected by the reflecting point is received through the first optical detector and detected, so that the detection laser beam emitted by the detection laser is coaxial with the detection laser beam reflected by the reflecting point, the gas at a long distance can be detected, the gas at a short distance can be detected, the signal to noise ratio is high, and the structure is simple.
According to the second aspect of the embodiment of the invention, the optical component for the portable gas detector comprises a detection laser, an optical filter, an N focus converging lens or an N focus concave reflecting mirror and a first optical detector, the detection laser emits detection laser beams to the region where the gas to be detected is located, stray light outside the detection laser beams reflected by N reflecting points which are located in the region where the gas is located and have different distances from the N focus converging lens or the N focus concave reflecting mirror is filtered through the optical filter, the detection laser beams reflected by the N reflecting points are received and detected through the first optical detector, so that the first optical detector can detect the gas at a long distance, can detect the gas at a short distance, and has high signal-to-noise ratio and simple structure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a first configuration of an optical module for a portable gas detector according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a second structure of an optical assembly for a portable gas detector according to an embodiment of the present invention;
FIG. 3 is a schematic view showing a third configuration of an optical assembly for a portable gas detector according to an embodiment of the present invention;
FIG. 4 is a schematic view of a fourth configuration of an optical assembly for a portable gas detector according to an embodiment of the present invention;
FIG. 5 is a schematic view showing a fifth configuration of an optical module for a portable gas detector according to an embodiment of the present invention;
FIG. 6 is a schematic view showing a sixth practical structure of an optical assembly for a portable gas detector according to the first embodiment of the present invention;
FIG. 7 is a schematic view of a seventh configuration of an optical assembly for a portable gas detector according to an embodiment of the present invention;
FIG. 8 is a schematic view of an eighth configuration of an optical module for a portable gas detector according to an embodiment of the present invention;
FIG. 9 is a schematic view of a ninth configuration of an optical module for a portable gas detector according to an embodiment of the present invention;
FIG. 10 is a schematic view showing a tenth structure of an optical module for a portable gas detector according to an embodiment of the present invention;
FIG. 11 is a schematic view showing an eleventh configuration of an optical module for a portable gas detector according to an embodiment of the present invention;
fig. 12 is a schematic view of a first structure of an optical assembly for a portable gas detector according to a second embodiment of the present invention;
Fig. 13 is a schematic view showing a second structure of an optical assembly for a portable gas detector according to a second embodiment of the present invention;
fig. 14 is a schematic view of a third structure of an optical assembly for a portable gas detector according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution of an embodiment of the present invention will be clearly described below with reference to the accompanying drawings in the embodiment of the present invention, and it is apparent that the described embodiment is a part of the embodiment of the present invention, but not all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The term "comprising" in the description of the invention and the claims and in the above figures and any variants thereof is intended to cover a non-exclusive inclusion. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
Example 1
As shown in fig. 1 to 11, the present embodiment provides an optical assembly 100 for a portable gas detector, which includes a bracket 101 and an optical element group integrally disposed on the bracket 101.
In application, the specific shape and structure of the bracket can be set according to actual needs, and the requirement of stably integrating and fixing the optical element group into a whole can be met.
The bracket 101 is illustratively shown in fig. 1-11 as U-shaped.
As shown in fig. 1 to 11, the optical element group provided in this embodiment includes:
a detection laser 1 for emitting a detection laser beam;
A first reflecting mirror 2 for reflecting the detection laser beam to the region where the gas to be detected is located;
A filter 3 for filtering out stray light outside the detection laser beam reflected back by the reflection point of the region where the gas to be detected is located;
a first photodetector 4 for receiving and detecting the detection laser beam reflected by the reflection point;
The reflecting surface of the first reflecting mirror 2 faces the emitting surface of the detection laser 1 and the area where the gas to be detected is located, the first reflecting mirror 2 is arranged on the incident surface or the emitting surface of the optical filter 3, and the incident surface of the optical filter 3 faces the reflecting point.
In application, the detection laser can be arranged on any one side of two outer side walls of the support, the positions of the side walls of the support corresponding to the emergent surface of the detection laser are made of light-transmitting materials or through holes capable of passing through detection laser beams are formed in the positions, the optical filter is arranged at the open end of the support, and the first optical detector can be arranged at the inner side of the bottom of the support, between the open end and the inner side of the bottom or embedded in the bottom of the support. The reflection point is a point on a background object or any solid object in the region where the gas to be measured is located.
In application, the first reflecting mirror may be a plane reflecting mirror, a total reflection prism, a total internal reflection prism, or a plane, prism or cube type transmission reflecting mirror (beam splitter) with a beam splitting function.
Fig. 1 exemplarily shows that the detection laser 1 is disposed on an outer side wall of the support 101, a through hole is formed on the outer side wall, the first reflecting mirror 2 is a total reflection triple prism and is disposed on an incident surface of the optical filter 3, the optical filter 3 is disposed at an open end of the support 101, and the first optical detector 4 is disposed at the bottom of the support 101 in an embedded manner.
Fig. 2 exemplarily shows that the detection laser 1 is disposed on an outer side wall of the support 101, the outer side portion is provided with a through hole, the first reflecting mirror 2 is a total internal reflection prism and is disposed on an outgoing surface of the optical filter 3, the optical filter 3 is disposed on an open end of the support 101, and the first optical detector 4 is disposed on a bottom of the support 101 in an embedded manner.
In one embodiment, the portable gas detector optical assembly further comprises:
And the collimating lens is arranged between the emergent surface of the detection laser and the reflecting surface of the first reflecting mirror.
In application, the collimating lens is used to expand and collimate the detection laser beam emitted by the detection laser. The collimating lens can be arranged between the side wall of the bracket and the emergent surface of the detection laser, and can also be arranged in a through hole formed in the side wall of the bracket.
Fig. 3 shows, by way of example on the basis of fig. 1, that a collimator lens 5 is arranged between the detection laser 1 and the through-opening of the holder 101.
In one embodiment, the portable gas detector optical assembly further comprises:
An indication laser for emitting a visible indication laser beam parallel to said detection laser beam;
The emergent surface of the indicating laser faces to the area where the gas to be detected is located.
In application, the indicating laser is used for emitting a single color or a combined color visible indicating laser beam in red, orange, yellow, green, cyan, blue, purple and the like to the area where the gas to be detected is located, and is used for laser indication.
In one embodiment, the indication laser beam and the detection laser beam are parallel to each other and have a distance of 10 mm-20 mm.
In application, the indicating laser is arranged on the opposite side or the same side of the emergent face of the detecting laser, the indicating laser and the indicating laser beam emitted by the indicating laser are not on the emitting and receiving light paths of the detecting laser beam, so that the detecting laser beam is not interfered, and the receiving efficiency of the detecting laser beam is not affected. The indication laser beam deviates from the detection laser beam on the transmission path, but the deviation distance between the indication laser beam and the detection laser beam is smaller, so that the indication laser beam can be used for indicating the position of the detection laser beam emitted to the gas area to be detected, and when the detection distance is longer, the deviation distance between the indication laser beam and the detection laser beam is negligible.
Fig. 4 shows, by way of example on the basis of fig. 3, that the indicator laser 6 is arranged on the other outer side wall of the holder 101, i.e. that the indicator laser 6 is arranged on the opposite side of the exit face of the detection laser 1.
In one embodiment, the first reflecting mirror is a transmission reflecting mirror, and is used for dividing the detection laser beam emitted by the detection laser into two beams;
The optical assembly for a portable gas detector further comprises:
a reference gas chamber sealed with a standard gas;
a second photodetector for receiving and detecting the detection laser beam transmitted inside the reference gas cell;
The reference air chamber is arranged on the opposite side of the emergent face of the detection laser, the second optical detector is arranged on one side, far away from the detection laser, of the reference air chamber, the detection laser beam is divided into two beams by the transmission reflector, one beam is transmitted to the region where the gas to be detected is located, and the other beam enters the reference air chamber.
In application, the reference air chamber is a closed air chamber, the reference air chamber is sealed with the same type of reference air as the gas to be detected, one side of the reference air chamber close to the detection laser is made of a light-transmitting material, and the light-transmitting material can be glass, polymethyl methacrylate (PMMA), polystyrene (PS), polycarbonate (PC), polydiallyldiglycol carbonate (CR-39) and the like. The second light detector can be arranged at one side of the reference air chamber far away from the detection laser, or can be arranged at one side of the reference air chamber far away from the detection laser in an embedded mode.
Fig. 5 shows, by way of example on the basis of fig. 3, that the first mirror 2 is a cube-type transmissive mirror, and that the second photodetector 8 is arranged embedded in the reference gas chamber 7 on the side facing away from the detection laser 1.
In one embodiment, the portable gas detector optical assembly further comprises:
a converging lens for converging the detection laser beam reflected by the reflecting point to the incident surface of the first photodetector;
The incident surface of the first light detector faces to the emergent surface of the optical filter, and the converging lens is arranged between the emergent surface of the optical filter and the incident surface of the first light detector.
In application, the converging lens may be a convex lens or a combination of a plurality of lenses with light converging, as long as the requirement of converging the detection laser beam reflected back by the reflection point to the first light detector can be satisfied.
Fig. 6 shows, by way of example on the basis of fig. 2, a converging lens 9 arranged between the exit face of the filter 3 and the entrance face of the first light detector 4, which converging lens 9 is a convex lens.
In application, due to the convergence of the converging lens, the incident surface of the first optical detector can be greatly reduced relative to the incident surface of the first optical detector when the converging lens is not used, so that the volume of the first optical detector can be reduced, and the volume of the optical component for the whole portable gas detector is further reduced.
In one embodiment, the converging lens is an N-focus converging lens, and is configured to converge the N detection laser beams reflected by the N reflection points to an incident surface of the first photodetector;
the distances between the N reflection points and the N focus converging lenses are different, N is more than or equal to 2, and N is an integer.
After the distance between the fixed lens and the optical detector is fixed, the traditional single focus lens can only image the reflection point in a certain distance range, the reflection point at other distances is seriously defocused after being imaged, the collection efficiency of the detection laser beam is greatly reduced, and the detection sensitivity is seriously reduced.
In application, by adopting the converging lens comprising more than one focus, the detection laser beam reflected by more than one reflecting point position of the area where the gas to be detected is positioned can be converged to the incidence surface of the first optical detector, so that the first optical detector can detect the gas to be detected at more than one reflecting point position, and the distances between the reflecting points and the N focus converging lens are different. The value of N can be set to be an integer which is more than or equal to 2 at will according to actual needs, and can image the reflecting points at far and near positions or image a plurality of reflecting points at far, medium distance, near positions and the like, so that after being focused by an N focus converging lens, detection laser beams reflected by the reflecting points at a large range at the far, medium and near positions can be collected by a first optical detector with higher collecting efficiency.
Fig. 7 shows, by way of example on the basis of fig. 6, that the converging lens 9 is a two-focus converging lens capable of converging the detection laser beams reflected by two reflection points of different distances between the converging lenses 9 to the first photodetector.
In one embodiment, the portable gas detector optical assembly further comprises:
A concave reflector for converging the detection laser beam reflected by the reflecting point to the incident surface of the first photodetector;
The first reflecting mirror is arranged on the incidence surface of the optical filter, the first light detector is arranged on the emergence surface of the optical filter, and the reflecting surface of the concave reflecting mirror faces the incidence surface of the first light detector.
In the application, when the optical component for the portable gas detector comprises a concave reflector, the first reflector is arranged on the incident surface of the optical filter, so that the first light detector can be arranged on the emergent surface of the optical filter, and the concave reflector is arranged on the inner side of the bottom of the bracket or is embedded in the bottom of the bracket, so that the volume of the optical component for the portable gas detector is reduced to the greatest extent. The first reflecting mirror may also be disposed on the exit surface of the optical filter, where the first light detector needs to be disposed between the first reflecting mirror and the concave reflecting mirror.
Fig. 8 illustrates, on the basis of fig. 1, that the first photodetector 4 is arranged on the exit face of the filter 3, and that the concave mirror 10 is arranged inside the bottom of the holder 101.
In one embodiment, the portable gas detector optical assembly further comprises:
a converging lens for further converging the detection laser beam converged by the concave reflecting mirror to the incident surface of the first photodetector;
the converging lens is arranged between the incident surface of the first light detector and the reflecting surface of the concave reflecting mirror.
In application, a converging lens can be added between the concave reflector and the first light detector to enhance the convergence of the detection laser beam.
In one embodiment, the concave reflecting mirror is an N-focus concave reflecting mirror, and is configured to converge the N detection laser beams reflected by the N reflection points to an incident surface of the first photodetector;
The distances between the N reflecting points and the N focus concave reflecting mirrors are different, N is more than or equal to 2, and N is an integer.
In application, by adopting the concave reflecting mirror with more than one focal point, the detection laser beams reflected by more than one reflecting point position of the region where the gas to be detected is positioned can be converged to the incidence surface of the first light detector, so that the first light detector can detect the gas to be detected at more than one positions with different distances. The value of N can be set to be an integer which is more than or equal to 2 at will according to actual needs, and reflection points at far and near positions can be imaged, or a plurality of reflection points at far, medium distance, near positions and the like can be imaged, so that after being converged by the N focus concave reflector, detection laser beams reflected by the reflection points at a large range at the far, medium and near positions can be collected by the first optical detector with higher collection efficiency.
Fig. 9 shows, by way of example on the basis of fig. 8, that the concave mirror 10 is a two-focal concave mirror, which is capable of converging the detection laser beam reflected by two reflection points at different distances from the concave mirror 10 to the first photodetector 4.
In one embodiment, the portable gas detector optical assembly further comprises:
A concave mirror for converging the detection laser beam reflected back by the reflection point;
A second reflecting mirror for reflecting the detection laser beam converged by the concave reflecting mirror to the incident surface of the first detector;
The second reflecting mirror is arranged between the emergent surface of the optical filter and the reflecting surface of the concave reflecting mirror, and the reflecting surface of the second reflecting mirror faces the reflecting surface of the concave reflecting mirror and the incident surface of the first light detector.
In application, when the optical component for the portable gas detector comprises a concave reflector and a second reflector, the first reflector is arranged on the incident surface or the emergent surface of the optical filter, the second reflector is arranged on the emergent surface of the optical filter or between the emergent surface of the optical filter and the reflecting surface of the concave reflector, the first light detector is arranged on the inner side of the side face of the support, the outer side of the side face of the support or is embedded in the side face of the support, the first light detector can be positioned on the same side or opposite side of the emergent surface of the detection laser, and the concave reflector is arranged on the inner side of the bottom of the support or is embedded in the bottom of the support, so that the volume of the optical component for the portable gas detector is reduced to the greatest extent.
In applications, the second mirror may be a planar mirror, a total reflection prism, or a total internal reflection prism.
Fig. 10 exemplarily shows that the first reflecting mirror 2 is disposed on the incident surface of the optical filter 3, the second reflecting mirror 11 is disposed on the exit surface of the optical filter 3, the first light detector 4 is disposed on the other outer side of the support 101 and opposite to the exit surface of the detection laser 1, and the concave reflecting mirror 10 is disposed on the bottom inner side of the support 101.
In one embodiment, the portable gas detector optical assembly further comprises:
a converging lens for further converging the detection laser beam converged by the concave mirror to the reflecting surface of the second mirror;
The converging lens is arranged between the reflecting surface of the second reflecting mirror and the reflecting surface of the concave reflecting mirror.
In application, a converging lens can be added between the concave mirror and the second mirror to enhance the convergence of the detection laser beam.
In one embodiment, the concave reflecting mirror is an N-focus concave reflecting mirror, and is configured to converge the N detection laser beams reflected by the N reflection points onto a reflecting surface of the second reflecting mirror;
The distances between the N reflecting points and the N focus concave reflecting mirrors are different, N is more than or equal to 2, and N is an integer.
In application, by adopting the concave reflecting mirror with more than one focal point, the detection laser beam reflected by more than one reflecting point position of the region where the gas to be detected is positioned can be converged to the reflecting surface of the second reflecting mirror and reflected to the incident surface of the first light detector through the second reflecting mirror, so that the first light detector can detect the gas to be detected at more than one positions with different distances. The value of N can be set to be an integer which is more than or equal to 2 at will according to actual needs, and reflection points at far and near positions can be imaged, or a plurality of reflection points at far, medium distance, near positions and the like can be imaged, so that after being converged by the N focus concave reflector, detection laser beams reflected by the reflection points at a large range at the far, medium and near positions can be collected by the first optical detector with higher collection efficiency.
Fig. 11 shows, by way of example on the basis of fig. 10, that the concave mirror 10 is a two-focal concave mirror, capable of converging the detection laser beam reflected by two reflection points at different distances from the concave mirror 10 to the second mirror 11.
According to the portable optical component for the gas detector, the detection laser beam emitted by the detection laser is reflected to the region where the gas to be detected is located through the reflector, stray light outside the detection laser beam reflected by the reflection point in the region where the gas is located is filtered through the filter, the detection laser beam reflected by the reflection point is received through the first optical detector and detected, so that the detection laser beam emitted by the detection laser is coaxial with the detection laser beam reflected by the reflection point, gas at a long distance can be detected, gas at a short distance can be detected, the signal to noise ratio is high, and the structure is simple.
Example two
As shown in fig. 12 to 14, the present embodiment provides an optical assembly 100 for a portable gas detector, which includes a bracket 101 and an optical element group integrally disposed on the bracket 101.
In application, the specific shape and structure of the bracket can be set according to actual needs, and the requirement of stably integrating and fixing the optical element group into a whole can be met.
Fig. 12 to 14 exemplarily show that the bracket 101 is U-shaped.
As shown in fig. 12 to 14, the optical element group provided in this embodiment includes:
a detection laser 1 for emitting a detection laser beam;
A filter 3, configured to filter stray light outside the detection laser beams reflected by the N reflection points in the region where the gas to be detected is located;
a first photodetector 4 for receiving and detecting the detection laser beam reflected by the reflection point;
an N focus converging lens 9 or an N focus concave reflecting mirror 10 for converging the N detection laser beams reflected back by the N reflection points to the incident surface of the first photodetector 4;
Wherein, the exit surface of the detection laser 1 faces to the area where the gas to be detected is located, the incident surface of the optical filter 3 faces to the reflection point, and the distances between the N reflection points and the N focus converging lens 9 or the N focus concave reflecting mirror 10 are different;
The incidence surface of the first light detector 4 faces the emergent surface of the optical filter 3, the N focus converging lens 9 is arranged between the emergent surface of the optical filter 3 and the incidence surface of the first light detector 4, or the first light detector 4 is arranged on the emergent surface of the optical filter 3, and the reflecting surface of the N focus concave reflecting mirror 10 faces the incidence surface of the first light detector 4;
n is more than or equal to 2 and N is an integer.
In application, the detection laser can be arranged on any one side of two outer side walls of the support, the positions of the side walls of the support corresponding to the emergent surface of the detection laser are made of light-transmitting materials or through holes capable of passing through detection laser beams are formed in the positions, the optical filter is arranged at the open end of the support, and the first optical detector can be arranged at the inner side of the bottom of the support, between the open end and the inner side of the bottom or embedded in the bottom of the support. The reflection point is a point on a background object or any solid object in the region where the gas to be measured is located.
In application, by adopting the converging lens or the concave reflecting mirror with more than one focus, the detection laser beam reflected by more than one reflecting point position of the area where the gas to be detected is positioned can be converged to the incidence surface of the first optical detector, so that the first optical detector can detect the gas to be detected at more than one reflecting point position, and the distances between the reflecting points and the N focus converging lens or the N focus concave reflecting mirror are different. The value of N can be set to be an integer which is more than or equal to 2 at will according to actual needs, and can image the reflecting points at far and near positions or image a plurality of reflecting points at far, medium distance, near positions and the like, so that after being focused by an N focus converging lens, detection laser beams reflected by the reflecting points at a large range at the far, medium and near positions can be collected by a first optical detector with higher collecting efficiency.
In fig. 12, the detection laser 1 is exemplarily shown to be disposed on an outer sidewall of the support 101, an exit surface of the detection laser 1 faces an area where a gas to be detected is located, the optical filter 3 is disposed at an open end of the support 101, the first optical detector 4 is embedded in a bottom of the support 101, an incident surface of the first optical detector 4 faces an exit surface of the optical filter 3, and the N focus converging lens 9 is a two focus converging lens and is disposed between the exit surface of the optical filter 3 and the incident surface of the first optical detector 4, so that detection laser beams reflected by two reflection points with different distances from the N focus converging lens 9 can be converged to the first optical detector 4.
Fig. 13 illustrates that the detection laser 1 is disposed on an outer side wall of the support 101, an exit surface of the detection laser 1 faces a region where a gas to be detected is located, the optical filter 3 is disposed at an open end of the support 101, the first optical detector 4 is disposed on the exit surface of the optical filter 3, the N-focal concave mirror 10 is a two-focal concave mirror and is disposed on an inner side of a bottom of the support 101, and the detection laser beams reflected by two reflection points having different distances from the N-focal concave mirror 10 can be converged to the first optical detector 4.
In one embodiment, the portable gas detector optical assembly further comprises:
An indication laser for emitting a visual indication laser beam;
The emergent surface of the indicating laser faces to the area where the gas to be detected is located.
In application, the indicating laser is used for emitting a single color or a combined color visible indicating laser beam in red, orange, yellow, green, cyan, blue, purple and the like to the area where the gas to be detected is located, and is used for laser indication.
In one embodiment, the indication laser beam and the detection laser beam are parallel to each other and have a distance of 10 mm-20 mm.
In application, the indicating laser is arranged on the opposite side or the same side of the detecting laser, the indicating laser and the indicating laser beam emitted by the indicating laser are not on the emitting and receiving light paths of the detecting laser beam, so that the detecting laser beam is not interfered, and the receiving efficiency of the detecting laser beam is not affected. The indication laser beam deviates from the detection laser beam on the transmission path, but the deviation distance between the indication laser beam and the detection laser beam is smaller, so that the indication laser beam can be used for indicating the position of the detection laser beam emitted to the gas area to be detected, and when the detection distance is longer, the deviation distance between the detection laser beam and the detection laser beam is negligible.
Fig. 14 shows, by way of example on the basis of fig. 12, that the indicator laser 6 is arranged on the other outer side wall of the holder 101 and on the opposite side of the detection laser 1.
According to the portable gas detector optical component, the detection laser emits detection laser beams to the region where the gas to be detected is located, stray light outside the detection laser beams reflected by N reflection points which are located in the region where the gas is located and have different distances from the first light detector is filtered out by the optical filter, the detection laser beams reflected by the N reflection points are received by the first light detector and detected, so that the first light detector can detect gas at a long distance and can detect gas at a short distance, and the portable gas detector optical component has a high signal-to-noise ratio and a simple structure.
The foregoing embodiments are merely illustrative of the technical solutions of the present invention, and not restrictive, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. An optical assembly for a portable gas detector is characterized by comprising the following optical elements:
a detection laser for emitting a detection laser beam;
a first reflecting mirror for reflecting the detection laser beam to the region where the gas to be detected is located;
the optical filter is used for filtering stray light outside the detection laser beam reflected by the reflection point of the region where the gas to be detected is located;
a first photodetector for receiving and detecting the detection laser beam reflected by the reflection point;
an N focus converging lens for converging N detection laser beams reflected by the N reflection points to the incidence surface of the first photodetector;
wherein, the detection laser beam emitted by the detection laser is coaxial with the detection laser beam reflected by the reflection point;
The reflecting surface of the first reflecting mirror faces the emergent surface of the detection laser and the region where the gas to be detected is located, the first reflecting mirror is arranged on the incident surface or the emergent surface of the optical filter, and the incident surface of the optical filter faces the reflecting point;
the incidence surface of the first light detector faces to the emergent surface of the optical filter, and the N focus converging lens is arranged between the emergent surface of the optical filter and the incidence surface of the first light detector;
The distances between the N reflection points and the N focus converging lenses are different, N is more than or equal to 2, and N is an integer.
2. The optical module for a portable gas detector according to claim 1, wherein the first reflecting mirror is disposed on an incident surface of the optical filter, and the first reflecting mirror is a total reflection prism;
or the first reflecting mirror is arranged on the emergent surface of the optical filter, and the first reflecting mirror is a total internal reflection triple prism.
3. The portable gas detector optical module according to claim 1, further comprising:
An indication laser for emitting a visible indication laser beam parallel to said detection laser beam;
The emergent surface of the indicating laser faces to the area where the gas to be detected is located.
4. The optical module for a portable gas detector according to claim 1, wherein the first reflecting mirror is a transmissive reflecting mirror for dividing a detection laser beam emitted from the detection laser into two beams;
The optical assembly for a portable gas detector further comprises:
a reference gas chamber sealed with a standard gas;
a second photodetector for receiving and detecting the detection laser beam transmitted inside the reference gas cell;
The reference air chamber is arranged on the opposite side of the emergent face of the detection laser, the second optical detector is arranged on one side, far away from the detection laser, of the reference air chamber, the detection laser beam is divided into two beams by the transmission reflector, one beam is transmitted to the region where the gas to be detected is located, and the other beam enters the reference air chamber.
5. An optical assembly for a portable gas detector is characterized by comprising the following optical elements:
a detection laser for emitting a detection laser beam;
The optical filter is used for filtering stray light outside the detection laser beams reflected by the N reflection points in the region where the gas to be detected is located;
a first photodetector for receiving and detecting the detection laser beam reflected by the reflection point;
an N focus converging lens for converging the N detection laser beams reflected by the N reflection points to the incidence surface of the first photodetector;
Wherein, the detection laser beam emitted by the detection laser is not coaxial with the detection laser beam reflected by the reflection point;
the emergent surface of the detection laser faces to the region where the gas to be detected is located, the incident surface of the optical filter faces to the reflecting points, and the distances between the N reflecting points and the N focus converging lenses are different;
the incidence surface of the first light detector faces to the emergent surface of the optical filter, and the N focus converging lens is arranged between the emergent surface of the optical filter and the incidence surface of the first light detector;
n is more than or equal to 2 and N is an integer.
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| CN207717617U (en) * | 2018-01-25 | 2018-08-10 | 中科华仪科技(深圳)有限公司 | A kind of bandgap wavelength locking distant reading type laser methane light-receiving regulating device |
| CN110031867A (en) * | 2019-05-09 | 2019-07-19 | 合肥光博量子科技有限公司 | A kind of portable aerosol boundary layer infrared acquisition laser radar |
| CN210604357U (en) * | 2019-07-26 | 2020-05-22 | 徐州旭海光电科技有限公司 | Optical assembly for portable gas detector |
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| US4786798A (en) * | 1987-06-18 | 1988-11-22 | Spectra-Physics Inc. | Beam forming and collection lens assembly for laser scanner system |
| CN104614362B (en) * | 2015-01-22 | 2017-05-10 | 华中科技大学 | Free space gas Raman scattering collecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207717617U (en) * | 2018-01-25 | 2018-08-10 | 中科华仪科技(深圳)有限公司 | A kind of bandgap wavelength locking distant reading type laser methane light-receiving regulating device |
| CN110031867A (en) * | 2019-05-09 | 2019-07-19 | 合肥光博量子科技有限公司 | A kind of portable aerosol boundary layer infrared acquisition laser radar |
| CN210604357U (en) * | 2019-07-26 | 2020-05-22 | 徐州旭海光电科技有限公司 | Optical assembly for portable gas detector |
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Address after: 221000 No. 99 Xu Hai Road, Xuzhou economic and Technological Development Zone, Xuzhou, Jiangsu Applicant after: Jiangsu Xuhai Photoelectric Technology Co.,Ltd. Address before: 221000 room 208, Clean Technology Industrial Park Service Center, Xuzhou Economic and Technological Development Zone, Jiangsu Province Applicant before: XUZHOU XUHAI OPTO-ELECTRONIC TECHNOLOGIES Co.,Ltd. |
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