CN2849755Y - Two spectral system of visual measurement - Google Patents

Abstract

The utility model relates to a two-light splitting system for visual measurement, which includes a non-polarized semi-transparent and semi-reflective beam splitter, a total reflection prism and an optical filter. The prism beam splitting system can divide a beam of light into two beams of different wavelengths and equal optical paths, and the obtained wavelength monochromatic spectrum line width is small and the light utilization rate is high. The spectroscopic system can be used in colorimetric temperature measurement technology, and it can be used in combination with light guide equipment such as industrial speculum or optical fiber and CCD camera to realize visual measurement of flame temperature of power plant pulverized coal boilers and internal combustion engines, and can be used in various A colorimetric thermometer is used to realize non-contact temperature measurement of high-temperature radiation, such as high-temperature radiation processes such as flames and solid surfaces, and can obtain some or all geometric parameters, brightness parameters, and further judge fuel characteristics from the characteristics of the flame. changes etc. This device can be used to collect fully synchronized image process of the same object, and further research and other work can be carried out based on this.

Description

Two-spectroscopic system for visual measurement

technical field

The utility model relates to a light-splitting system, in particular to a light-splitting system composed of a semi-transparent and semi-reflective beam splitter, a total reflection prism and an optical filter.

Background technique

The colorimetric temperature measurement technology has the characteristics of simple operation and fast response. It can conveniently measure the flame temperature of pulverized coal boilers and internal combustion engines in power stations, so as to monitor the above-mentioned combustion in real time. Various colorimetric thermometers made by colorimetric temperature measurement technology are widely used in radiation temperature measurement. The basic principle of visual colorimetric temperature measurement is to divide the beam emitted by the measured object into two or more beams with different central wavelengths through the optical splitting system, each beam has a certain bandwidth and forms a grayscale image of its own , the temperature to be measured can be obtained by comparing the brightness values of different images. Therefore, the key to realizing the colorimetric temperature measurement using the above method is to use the spectroscopic system to successfully separate the projected beam of the target to be measured.

There are three types of existing flame visualization measurement systems:

1. Use the inherent red, green and blue characteristics of a single color CCD to split light through post-processing;

2. Two CCD cameras are used to collect radiation thermal images of different wavelengths at the same time;

3. Using a single CCD, the radiant thermal images at different wavelengths are alternately collected by the rotary disc with a filter in front of the camera.

The problem that these methods exist is that the wavelength and bandwidth of the flame cannot be selected according to the measurement range (such as method 1), the equipment structure is complicated (such as methods 2 and 3), and the influence of different CCD characteristics increases (such as method 2). Ensure that the size of the collected images is exactly the same (such as method 2) and the acquisition is not synchronized (such as method 3).

Utility model content

The purpose of the utility model is to provide a prism beam splitting system that divides a beam of light into two beams with different wavelengths and equal optical paths, and the obtained wavelength monochromatic spectrum line width is small and the light utilization rate is high.

The scheme that the utility model solves technical problem is:

A two-light splitting system for visual measurement is provided, including a semi-transparent and semi-reflective beam splitter, a prism and an optical filter. A non-polarizing semi-transparent and semi-reflective beam splitter is arranged on the main optical path, and its right side is closely connected with a total reflection Prism, the two mirrors are on the same horizontal plane, the side of the beam splitter is connected to the right angle side of the total reflection prism, and the reflection side of the total reflection prism is upward; directly above the total reflection prism, there is a second total reflection prism, directly below the beam splitter, There is a third total reflection prism, the reflection sides of the second total reflection prism and the third total reflection prism face to the right, the light paths reflected by the two mirrors are parallel to each other, and a filter is arranged on each of the two light paths.

In the two light-splitting systems, the two optical filters are each provided with a diamond-shaped total reflection prism on the right optical path, and the reflection sides of the two rhombus-shaped total reflection prisms face to the right.

In the two beam splitting systems, the light paths reflected by the second total reflection prism and the third total reflection prism are parallel to each other, and a rhombus total reflection prism is respectively arranged on the two optical paths, and the reflection sides of the two rhombus total reflection prisms are to the right , each of the light paths reflected by the two mirrors is provided with a filter.

In the two-light splitting system, the total reflection prism can be replaced by a total reflection mirror.

The spectroscopic system of the utility model can be applied to the colorimetric temperature measurement technology, and can be used in combination with light guide equipment such as industrial speculum or optical fiber and a CCD camera to realize the visual measurement of the flame temperature of the power plant pulverized coal boiler and internal combustion engine, and can be applied In the non-contact temperature measurement of high-temperature radiation that requires various colorimetric thermometers, such as high-temperature radiation processes such as flames and solid surfaces, and can obtain some or all geometric parameters (flame position, size, opening angle, center of gravity, etc.) , ignition point), brightness parameters, and further judging the change of fuel characteristics from the characteristics of the flame.

The utility model is characterized in that the temperature measurement range depends on factors such as the wavelength and bandwidth of the filter and the corresponding range of the spectrum of the CCD. Target images of the same size at wavelength and their fully synchronized acquisition.

The utility model is also suitable for occasions where it is necessary to collect images of the same object that are completely synchronized, and to conduct further research work on the basis of this.

Description of drawings

Fig. 1 is the schematic diagram of the principle of the utility model;

Fig. 2 is a cross-sectional view of the half-transparent and half-reflective beam splitter and each prism.

Detailed ways

A prism beam splitting system is characterized in that it includes: - a non-polarized light splitting semi-transparent and semi-reflective beam splitter, which can divide a beam of incident light into two beams of light with equal light intensity and perpendicular to each other; - a total reflection prism, a number A total reflection right-angle prism is arranged in the optical path according to the requirements, and the optical path of the two beams of light can be equalized by adjusting the position of the total reflection prism; —— Optical filter, the filter can be placed in the optical path to obtain the desired wavelength and bandwidth beam.

The beam splitting process of the utility model is as follows: the beam emitted by the target is divided into two beams after passing through the semi-transparent and semi-reflective beam splitter, and the light intensity of the divided two beams is determined by the property of the semi-transparent and semi-reflective beam splitter; Different optical filters are set in each of them, and the light beam becomes monochromatic light of the corresponding wavelength after passing through the optical filter; the two beams pass through the total reflection prism group in different optical paths to adjust the influence of the optical filter and different optical paths to ensure their have equal optical path lengths.

Now further illustrate the specific embodiment of the utility model in conjunction with accompanying drawing.

In Fig. 1, a non-polarizing semi-transparent and semi-reflective beam splitter 1 is set on the main optical path, and a total reflection prism 3 is closely connected to its right side, and the two mirrors are on the same horizontal plane, and the side of the beam splitter 1 is connected to the total reflection prism 3 The sides at right angles are connected, and the reflection side of the total reflection prism 3 is upward. Directly above the total reflection prism 3, a total reflection prism 2 is provided. Directly below the beam splitter 1, a total reflection prism 4 is provided. The reflection sides of the total reflection prism 2 and the total reflection prism 4 are to the right, and the light paths reflected by the two mirrors are parallel to each other, and a filter 5, 6 is respectively arranged on the two light paths. The light path on the right side of the optical filter 5,6 is respectively provided with a rhombus total reflection prism 7,8, and the reflection edge of the rhombus total reflection prism 7,8 is to the right.

The target incident light beam enters from the left, and is divided into two beams of light with equal light intensity by the non-polarizing semi-transparent and semi-reflective beam splitter 1. Wherein a bundle of light beams exits along the original incident direction, enters the total reflection prism 3, and forms an optical path through the total reflection prisms 3, 2 and 7, and an optical filter 5 is placed between the total reflection prisms 2 and 7, then this path The light beam becomes monochromatic light of the corresponding wavelength after passing through the filter sheet 5; the direction of another beam of light is perpendicular to the original incident light beam, and enters the total reflection prism 4, and forms another optical path through the total reflection prisms 4 and 8, and passes through the total reflection prisms 4 and 8 to form another light path. A filter 6 is placed between the prisms 4 and 8, so the light beam of this path becomes monochromatic light of corresponding wavelength after passing through the filter 6. For example, when the target incident light beam is a visible light beam, the central wavelength of the optical filter 5 is 600nm, and the bandwidth is 20nm; when the central wavelength of the optical filter 6 is 700nm, and the bandwidth is 20nm, the visible light beam will be obtained after passing through the prism spectroscopic system. Two beams with wavelength ranges of 600±10nm and 700±10nm respectively.

In Fig. 1, the adjustment of the optical lengths of the two optical paths can be realized by adjusting the positions of the total reflection prisms 2, 3, 4, 7 and 8 to ensure that the two optical paths have equal optical lengths.

In Fig. 1, the optical filters 5 and 6 can be placed in the same optical path, on the optical path to the right of the rhombic total reflection prisms 7, 8, as shown by the dotted line.

In FIG. 2, cross-sectional views of various half-reflective beam splitters 1 and prisms 2, 3, 4, 7 and 8 are shown.

The above-mentioned embodiments of the utility model are only used to illustrate the technical scheme of the utility model, and it should not limit the scope of protection of the utility model. scope.

Claims (4)

1. A two-light splitting system for visual measurement, comprising a semi-transparent and semi-reflective beam splitter, a prism and an optical filter, characterized in that: a non-polarizing semi-transparent and semi-reflective beam splitter is set on the main optical path, and its right side is close to Connect a total reflection prism, the two mirrors are on the same horizontal plane, the side of the beam splitter is connected to the right angle side of the total reflection prism, and the reflection side of the total reflection prism is upward; directly above the total reflection prism, there is a second total reflection prism for beam splitting Directly below the mirror, there is a third total reflection prism, the reflection sides of the second total reflection prism and the third total reflection prism face to the right, the light paths reflected by the two mirrors are parallel to each other, and a filter is respectively arranged on the two light paths. 2. The two-light splitting system as claimed in claim 1, characterized in that: said two optical filters are respectively provided with a diamond-shaped total reflection prism on the optical path on the right thereof, and the reflection sides of the two rhombus-shaped total reflection prisms face to the right. . 3. The two-light splitting system according to claim 1, characterized in that: the light paths reflected by the second total reflection prism and the third total reflection prism are parallel to each other, and a rhombus total reflection prism is respectively arranged on the two light paths, and two diamond-shaped total reflection prisms The reflection edge of the total reflection prism faces to the right, and a filter is respectively arranged on the light paths reflected by the two mirrors. 4. The two-light splitting system according to claim 1, characterized in that: the total reflection prism can be replaced by a total reflection mirror.

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