CN201133899Y - A Long Optical Path Atmospheric Monitor - Google Patents

Abstract

The utility model relates to a long optical path atmospheric monitor, which is open or closed, and includes an optical generation part and a signal processing part, and the optical generation part includes: a transmitter, a receiver, and a A plurality of groups of concave mirrors or prisms forming a sufficient optical path, through the reflection of light between the concave mirrors or the total reflection between the prisms, thereby generating sufficient optical paths; the signal processing part includes sequentially connected optical fiber, spectrometer, scanner, photoelectric detector and computer, the input end is connected with the receiver by optical fiber.

Description

A Long Optical Path Atmospheric Monitor

technical field

The utility model relates to an environmental testing technology, in particular to a gas analysis instrument for detecting the composition and content of atmospheric gas.

Background technique

For the long optical path DOAS (Differential Optical Absorption Spectroscopy) technology, it mainly uses the absorption characteristics of trace pollution components in the air to ultraviolet and visible light bands for qualitative and quantitative analysis. It can monitor a variety of trace gas components at the same time, and the measurement range can be from 100 meters to thousands of meters, with high sensitivity.

Usually, the application of long optical path DOAS technology is to generate optical radiation by using the emitter installed on the high-rise building, collimating and transmitting it to the atmospheric path through the telescope system, and installing a corner reflector at the other end (50---200 meters) Reflect it back. The light reflected back through the atmospheric path is processed by the spectrometer, and the radiation spectrum obtained is compared with the lamp spectrum to obtain their difference to determine the gas composition in the atmosphere. Since each gas has its own characteristic absorption spectrum, the concentration of the absorbing gas and gas can be determined by analyzing the change of the spectrum.

But there are following deficiencies in monitoring the gas concentration in the air for existing long optical path atmospheric measuring instrument: at first long optical path atmospheric measuring instrument selects a point, installs, because transmitter must be on a high-rise building when installing Choose a point, choose another point for the receiver 100 meters away, and avoid obstacles in the middle, but often after the instrument is installed and used for a period of time, new obstacles may appear between the two points, which is the second time. point selection problem;

Secondly, because this kind of long-distance point selection setting is not conducive to the maintenance of the long optical path atmospheric tester, it costs manpower and time, and the efficiency is poor.

For overcoming above-mentioned defective, the creator of the utility model finally obtained this creation through long-term research and experiment.

Contents of the invention

The purpose of this utility model is to provide a long optical path atmospheric monitor to overcome the above defects.

In order to achieve the above object, the technical solution adopted by the utility model is to firstly provide a long optical path atmospheric monitor, which is open and includes an optical generation part and a signal processing part. The optical generation part includes: a transmitter, A first flat mirror is arranged on the optical path of the light emitted by the transmitter, and a first concave mirror is arranged on the optical path of the light emitted by the first flat mirror, and a first concave mirror is arranged on the optical path of the light reflected by the first concave mirror. A second concave mirror is provided, a third concave mirror is arranged on the optical path of the light reflected by the second concave mirror, a fourth concave mirror is arranged on the optical path of the reflected light of the third concave mirror, and on the optical path of the light reflected by the third concave mirror, A receiver is arranged on the optical path of the light reflected by the fourth concave mirror;

The signal processing part includes an optical fiber connected in sequence, a spectrometer, a scanner, a photodetector and a computer, and the input end of the optical fiber is connected to the receiver;

Preferably, the position adjustment unit also includes: an optical support, a rotating mechanism and a power device, the optical generation part is arranged on the optical support, and the output end of the rotating mechanism is connected to the optical support. affixed to make the optical support rotate, and the input end of the rotating mechanism is connected to the input end of the power device to provide power for the rotating mechanism;

Preferably, the optical generation part is divided into: a first optical component, which is composed of the first concave mirror and the third concave mirror;

The second optical component is composed of the transmitter, the second concave mirror, the fourth concave mirror and the receiver, the first optical component and the second optical component are respectively arranged on the optical At both ends of the bracket, the distance between the first optical component and the second optical component is between 0.3 meters and 20 meters;

Preferably, the rotating mechanism includes: a rotating shaft, a bearing and a gear transmission mechanism, the gear transmission mechanism includes a driving gear and a driven gear, and the driven gear is fixed on the rotating shaft, and meshed with the driving gear, the bearing is sleeved on the rotating shaft, and the input end of the rotating mechanism is the output end of the rotating shaft;

Preferably, it also includes a gearbox, the output shaft of the gearbox is connected to the driving gear, and the input end of the gearbox is connected to the output end of the power device;

Preferably, it also includes a wind direction indicator, the wind direction indicator is connected to the computer, the computer is connected to the control terminal of the power device, and the power device is a motor;

Preferably, it also includes a first lens, which is arranged between the emitter and the first plane reflector;

Preferably, the radius of curvature of the first concave mirror, the second concave mirror, the third concave mirror and the fourth concave mirror is between 20 cm and 500 cm;

Preferably, the material used for the first plane reflector and each concave mirror is quartz or ultraviolet optical quartz glass material, and its reflective surface is plated with gold or silver and coated with a protective film;

Secondly, a long optical path atmospheric monitoring instrument is provided, which is a closed type, including an optical generation part and a signal processing part, wherein the optical generation part is arranged in a closed body, and the closed body has a measured gas inlet and a measured gas outlet;

The optical generation part includes: an emitter, which is located outside the enclosure, and a plurality of prisms are correspondingly arranged on the side wall of the enclosure, wherein a first prism receives the emitter The emitted light is provided with a second prism on the optical path of the light passing through the first prism, and a third prism is arranged on the optical path of the light after the total reflection of the second prism, and the light is completely reflected by the third prism. A fourth prism is arranged on the optical path, a fourth prism is arranged on the optical path of the light after the total reflection of the third prism, until the 2k-th prism is arranged on the optical path of the light after the total reflection of the 2k-1 prism, in the said A photoelectric receiver is provided on the outside of the closed body to receive the light passing through the 2kth prism, wherein k is a natural number and is greater than or equal to 2;

The signal processing part includes an optical fiber connected in sequence, a spectrometer, a scanner, a photodetector and a processor, and the input end of the optical fiber is connected to the photoelectric receiver;

Preferably, a clean air curtain is provided in the enclosed body.

Compared with the prior art, the utility model has the beneficial effect that the utility model replaces the original two scattered optical systems by an integrated optical system, so that the life of the whole system is greatly improved, and the rotation of the system is controlled by a computer so that The measured value is more realistic;

Since the optical system adopts an integrated design, it overcomes the influence of the light generated by the traditional optical system on the surrounding environment. From the perspective of use and maintenance, the installation is only carried out at one location, the debugging is simplified, and the maintenance is convenient;

Due to the adoption of the above technology, the utility model has the advantages of simple structure, long service life and high detection precision, and can be used for on-line detection.

Description of drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment one of the long optical path atmospheric monitor of the present invention;

Fig. 2 is the structural diagram of the optical generation part of the preferred example one of the long optical path atmospheric monitor of the present invention;

Fig. 3 is a schematic structural diagram of a preferred example 2 of the long optical path atmospheric monitor of the present invention.

Detailed ways

The above-mentioned and other technical features and advantages of the present utility model will be described in more detail below in conjunction with the accompanying drawings.

Please refer to Fig. 1, the structural diagram of the long optical path atmospheric monitoring instrument of the present invention includes an optical generation part and a signal processing part, and the optical generation part is used to generate an optical path with sufficient optical path, which includes a first optical The component 11 and the second optical component 12, the signal processing part analyzes the physical characteristics of the received light to obtain the atmospheric environment condition, and the signal processing part includes an optical fiber 21 connected in sequence, a spectrometer 22, a scanning Instrument 23, photodetector 24 and computer 25;

It also includes: a position adjustment unit including: an optical bracket 31, a rotating mechanism and a power device, the optical generation part is arranged on the optical bracket 31, the output end of the rotating mechanism is connected to the The optical bracket 31 is fixedly connected to make the optical bracket 31 rotate, and the input end of the rotation mechanism is connected with the output end of the power device to provide power for the rotation mechanism, wherein the The rotating mechanism includes: a rotating shaft 321, a bearing 322 and a gear transmission mechanism. The gear transmission mechanism includes a driving gear 3231 and a driven gear 3232. The driven gear 3232 is fixed on the rotating shaft 321. , and meshed with the driving gear 3231, the bearing 322 is sleeved on the rotating shaft 321, the input end of the rotating mechanism is the output end of the rotating shaft 321, and a gearbox 34 is also included, The output shaft of the gearbox 34 is connected with the driving gear 3231, the input end of the gearbox 34 is connected with the output end of the power plant, and the utility model also includes a wind direction indicator, the Described wind direction instrument is connected with described computer 25, and described computer 25 is connected with the control terminal of described power plant, and described power plant is motor, and computer 25 is controlled by the direction parameter that wind instrument transmits The motor drives the rotation direction and rotation angle of the optical support 31 in the position adjustment unit, so that the measured value is closer to the real one.

Please refer to shown in Fig. 2, it is the structural diagram of the optical generation part of the preferred example one of the long optical path atmospheric monitoring instrument of the present invention; The xenon lamp emits ultraviolet light, and a first plane reflector 122 is arranged on the optical path of the light emitted by the emitter 121, and also includes a first lens 123, which is arranged between the emitter 121 and the first plane Between the reflecting mirrors 122, in order to condense light, a first concave mirror 111 is arranged on the optical path of the light emitted by the first plane mirror 122, and a second concave surface is arranged on the optical path of the light reflected by the first concave mirror 111 The mirror 124 is provided with a third concave mirror 112 on the optical path of the light reflected by the second concave mirror 124, and the fourth concave mirror 125 is arranged on the optical path of the reflected light by the third concave mirror 112. A receiver 126 is arranged on the light path of the light after the fourth concave mirror 125 reflection, so that the light is reflected back and forth between the first concave mirror 111, the second concave mirror 124 and the third concave mirror 112 multiple times like this, so that the optical path reaches the required The value (200 meters to 1000 meters), the light is reflected to the fourth concave mirror 125 by the third concave mirror 112, and finally the light is converged to the receiver 126 by the fourth concave mirror 125, at this time, the optical system completes the The tasks of the system, the input end of the optical fiber 21 of the signal processing part 2 is connected with the receiver 126 for processing; the first concave mirror 111, the second concave mirror 124, the third concave mirror 112 and The radius of curvature of the fourth concave mirror 125 is between 20 centimeters and 500 centimeters, and the material used for the first plane reflector 122 and each concave mirror is quartz or ultraviolet optical quartz glass material, and its reflective surface is plated with gold or silver, and is plated for protection. film; wherein, the first optical assembly 11 is composed of the first concave mirror 111 and the third concave mirror 112; the second optical assembly 12 is composed of the emitter 121 , a second concave mirror 124, a fourth concave mirror 125 and a receiver 126, the first optical assembly 11 and the second optical assembly 12 are respectively arranged at both ends of the optical bracket 31, the The distance between the first optical assembly 11 and the second optical assembly 12 is between 0.3 meters and 20 meters;

Please refer to Fig. 3, which is a schematic structural diagram of the second preferred example of the long optical path atmospheric monitoring instrument of the present invention, which is closed and includes an optical generation part 1' and a signal processing part 2', wherein the The optical generation part 1' is arranged in a closed body 4', and the closed body 4' has a measured gas inlet 41' and a measured gas outlet 42', and a clean air curtain 43' is arranged inside;

The optical generating part 1' includes: an emitter 11', which is a light source, located outside the closed body 4', and a plurality of correspondingly arranged on the side wall of the closed body 4' Prisms, wherein the first prism 12' receives the light emitted by the emitter 11', and a second prism 13' is arranged on the optical path of the light passing through the first prism 12', and the second prism 13' is completely A third prism 14' is arranged on the light path of the reflected light, and a fourth prism 15' is arranged on the light path of the light after total reflection by the third prism 14', and the light of the light after total reflection by the third prism 14' A fourth prism 15' is arranged on the road until the 2k prism is arranged on the optical path of the light after the total reflection of the 2k-1 prism, and a photoelectric receiver is arranged outside the closed body 4 to receive the light passing through the 2k prism, Reflecting back and forth on multiple set prisms, the optical path finally reaches the required distance of 200 meters to 1000 meters. Among them, k is a natural number and is greater than or equal to 2. The larger the value of k, the closer the distance between the relative prisms , that is, the smaller the length of the closed body 4', if k is 6 here, a total of 12 prisms are needed, namely from the first prism to the twelfth prism;

The signal processing part includes an optical fiber, a spectrometer, a scanner, a photodetector and a computer connected in sequence, and the input end of the optical fiber is connected with the photoelectric receiver.

The above descriptions are only preferred embodiments of the present utility model, and are only illustrative, not restrictive, of the present utility model. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the utility model, but all will fall within the protection scope of the utility model.

Claims (11)

1, a kind of long optical path air monitoring instrument, it is open, comprise that optics produces part and signal processing, it is characterized in that: described optics generating unit branch comprises: transmitter, be provided with one first plane mirror with the light path of described transmitter emission light, light path through first level crossing emission back light is provided with one first concave mirror, the light path of described first concave mirror reflection back light is provided with one second concave mirror, the light path of described second concave mirror reflection back light is provided with one the 3rd concave mirror, the 4th concave mirror is arranged on the light path of described the 3rd concave mirror reflection ray, and the light path of described the 4th concave mirror reflection back light is provided with a receiver;

Described signal processing comprises, the optical fiber of Lian Jieing, spectrometer, scanner, photodetector and computing machine in regular turn, and described input end is connected with optical fiber with described receiver.

2, long optical path air monitoring instrument according to claim 1, it is characterized in that: comprise that also position adjustment unit comprises: optics support, rotating mechanism and propulsion system, described optics generating unit branch is arranged on the described optics support, the output terminal of described rotating mechanism and described optics support Joint, make described optics support produce rotation, the input end of described rotating mechanism is connected with the input end of described propulsion system, for described rotating mechanism provides power.

3, long optical path air monitoring instrument according to claim 2 is characterized in that: described optics produces part and is divided into: first optical module, and it is made up of described first concave mirror, the 3rd concave mirror;

Second optical module, it is made up of described transmitter, second concave mirror, the 4th concave mirror and receiver, described first optical module and described second optical module are arranged at the two ends of described optics support respectively, and the distance between described first optical module and described second optical module is between 0.3 meter to 20 meters.

4, long optical path air monitoring instrument according to claim 2, it is characterized in that: described rotating mechanism comprises: turning axle, bearing and gear drive, described gear drive comprises driving gear and follower gear, described follower gear is installed on the described turning axle, and be meshed with described driving gear, described bearing holder (housing, cover) is on described turning axle, and the input end of described rotating mechanism is the output terminal of turning axle.

5, long optical path air monitoring instrument according to claim 4 is characterized in that: also comprise wheel box, the output shaft of described wheel box is connected with described driving gear, and the input end of described wheel box is connected with the output terminal of described propulsion system.

6, long optical path air monitoring instrument according to claim 2, it is characterized in that: also comprise wind indicator, described wind indicator is connected with described computing machine, and described computing machine is connected with the control end of described propulsion system, and described propulsion system are motor.

7, long optical path air monitoring instrument according to claim 1 is characterized in that: also comprise first lens, it is arranged between described transmitter and described first plane mirror.

8, long optical path air monitoring instrument according to claim 1 is characterized in that: the radius-of-curvature of described first concave mirror, second concave mirror, the 3rd concave mirror and the 4th concave mirror is between 20 centimetres to 500 centimetres.

9, long optical path air monitoring instrument according to claim 1 is characterized in that: described first plane mirror and each concave mirror materials used are quartz or ultraviolet optics silica glass material, and its reflecting surface is gold-plated or silver-colored, simultaneously protective film coating.

10, a kind of long optical path air monitoring instrument, it is closed, comprises that optics produces part and signal processing, is characterized in that: wherein, described optics generating unit branch is arranged in the obturator, and described obturator has a tested gas access and a tested gas vent;

Described optics generating unit branch comprises: transmitter, it is positioned at the described obturator outside, correspondingly on the sidewall of described obturator be provided with a plurality of prisms, one first prism wherein, receive the light that described transmitter sends, the light path that sees through the first prism light is provided with one second prism, the light path of light is provided with a prism after the described second prism total reflection, the light path of light is provided with one the 4th prism after the described prism total reflection, the light path of light is provided with one the 4th prism after the described prism total reflection, the light path of light is provided with the 2k prism after the total reflection of 2k-1 prism, be provided with a photelectric receiver in the described obturator outside and receive the light that sees through the 2k prism, wherein, k is a natural number, and more than or equal to 2;

Described signal processing comprises, the optical fiber of Lian Jieing, spectrometer, scanner, photodetector and a processor in regular turn, and described input end links to each other with optical fiber with described photelectric receiver.

11, long optical path air monitoring instrument according to claim 10 is characterized in that: be provided with clean air curtain in the described obturator.

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