CN114216874A - Long-optical-path infrared laser optical system - Google Patents
Long-optical-path infrared laser optical system Download PDFInfo
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- CN114216874A CN114216874A CN202111557618.4A CN202111557618A CN114216874A CN 114216874 A CN114216874 A CN 114216874A CN 202111557618 A CN202111557618 A CN 202111557618A CN 114216874 A CN114216874 A CN 114216874A
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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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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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
Abstract
The invention provides a long-optical-path infrared laser optical system, which comprises a host end and a reflection end, wherein infrared laser is collimated by a collimation module, so that the problem that the laser emitted by a laser has a certain divergence angle is solved, a light beam can be reflected by the collimation module to expand, the divergence angle of the light beam is reduced during long-distance long-optical-path transmission, the loss of effective light energy is avoided, the diameter of a light spot is prevented from being increased after the light beam is transmitted for a long distance, visible light and the infrared laser are coupled by a dichroic mirror, the coupling of the light beam with multiple wavelengths is realized, the light beam of the infrared laser and the light beam of the visible light are coincided and emitted, the light path of the infrared laser can be judged by looking at the visible light through naked eyes during debugging, and the debugging is convenient.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a long-optical-path infrared laser optical system.
Background
In recent years, with the rapid development of the automobile industry, the problem of environmental pollution caused by tail gas discharged when automobiles run brings great trouble to people, particularly, in recent years, the fuel oil vehicle has a rapidly increased holding capacity, the automobile exhaust problem increasingly threatens the health and property safety of modern human beings, in order to monitor the atmospheric environment on the road and know the atmospheric environment on the road in real time, a plurality of traffic atmospheric environment monitoring devices are arranged beside the road, wherein the optical detection method for detecting the concentration and the components of the detected gas according to certain optical characteristics of the gas is widely applied due to the reasons of fast response, accurate detection result and the like, the infrared laser optical system can be used for quantitatively analyzing the concentration of the detected gas and qualitatively analyzing related gas components in the mixed gas.
The utility model provides a gaseous sampling monitoring device of long optical path pulse infrared laser absorption formula that disclosure number is CN109709059A provides, it divides the light that pulse laser light source sent into two parts, one part gets into reference light path pipe, another part gets into survey light path pipe, convert respective signal of telecommunication into through photoelectric conversion part, through comparing the signal of telecommunication between them, judge and wait to detect VOC content in the sample, although can judge the air quality, still there is not enough when using on the traffic road, the traffic road is comparatively broad, cause the optical path longer, infrared laser is in the in-process of carrying out the transmission, can have the energy loss of light, cause the measuring result inaccurate, and because infrared light is invisible light, the optical path can not be looked at in the in-process of debugging, cause the debugging comparatively difficult.
Disclosure of Invention
The present invention is directed to a long optical path infrared laser optical system, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a long optical path infrared laser optical system, includes host computer end and reflection end, the reflection end mainly includes the speculum for the infrared laser that the reflection host computer end emitted and the visible laser of debugging, host computer end and reflection end are located respectively and wait to detect air medium both ends, and relative setting, wherein, the host computer end includes:
the laser emitting direction of the infrared laser faces the light source coupling unit and is used for emitting infrared laser to irradiate the light source coupling unit;
the laser irradiation port of the visible laser faces the light source coupling unit and is used for emitting visible laser and irradiating the light source coupling unit;
the light source coupling unit is a wedge-shaped lens, faces the collimation module in the emergent direction, and is used for coupling the infrared laser and the visible laser into a beam of light;
the emergent direction of the collimation module faces the deflection unit and is used for collimating the coupled light beams and reducing the divergence angle of the light beams;
the emergent direction of the deflection unit faces the reflector and is used for deflecting and adjusting the emergent direction of the coupled light beam so as to enable the coupled light beam to accurately point to the reflector;
the exit direction of the infrared laser of the color separation sheet faces the off-axis parabolic mirror, and the incident direction of the infrared laser faces the reflection direction of the reflector beam, and the color separation sheet is used for reflecting the visible laser by transmitting the infrared laser;
the exit direction of the off-axis parabolic mirror faces to the detector and is used for focusing the infrared laser after reflection treatment;
and a light receiving port of the detector is positioned in the reflection direction of the infrared laser of the off-axis parabolic mirror and is used for distinguishing and absorbing the focused infrared laser and carrying out spectral analysis to detect the quality of the gas in the air.
Preferably, the light source coupling unit adopts a wedge-shaped dichroic mirror, the surface of the light source coupling unit is coated with an antireflection film, and the infrared laser and the visible laser are positioned on the same side of the light source coupling unit.
Preferably, the collimating module includes a first plane mirror, a second plane mirror, a convex mirror and a concave mirror, the light source coupling unit couples the outgoing direction of the light beam toward the first plane mirror, the first plane mirror reflects the coupled light beam to the second plane mirror, the second plane mirror reflects the coupled light beam to the convex mirror, the focuses of the concave mirror and the convex mirror are overlapped, the convex mirror reflects the coupled light beam to the concave mirror, and the concave mirror reflects the coupled light beam to the deflecting unit.
Preferably, the reflecting surfaces of the convex reflector and the concave reflector are plated with a protective gold film or a silver film.
Preferably, the deflection unit includes a deflection mirror and a two-dimensional deflection platform, the deflection mirror is mounted on the deflection platform, and the deflection platform is used for driving the deflection mirror to rotate in two dimensions.
Preferably, the reflector is composed of an upper reflecting surface and a lower reflecting surface, and an angle between the two reflecting surfaces is a right angle.
Preferably, the focusing view angle of the off-axis parabolic mirror is within the receiving view angle range of the detector.
Preferably, the detector is based on an MCT infrared photodetector.
Preferably, the infrared laser is based on a quantum cascade laser, and the visible light emitted by the visible laser is green light with a wavelength in the range of nm-nm.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the infrared laser is collimated by the collimating module, so that the problem that the laser emitted by the laser has a certain divergence angle is solved, the light beam can be reflected by the collimating module to expand the beam, the divergence angle of the light beam is reduced during long-distance long-range transmission, the loss of effective light energy is avoided, the diameter of a light spot is prevented from being increased after the light beam is transmitted in a long distance, the visible light and the infrared laser are coupled through the dichroic mirror, the coupling of light beams with multiple wavelengths is realized, the infrared laser and the light beam of the visible light are coincided and emitted, the light path of the infrared laser can be judged by looking over the visible light through naked eyes during debugging, and the debugging is facilitated.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention;
FIG. 2 is a schematic diagram of the overall optical path operation of the present invention;
fig. 3 is a schematic structural view of a deflection unit according to the present invention.
In the figure: the device comprises an infrared laser 1, a visible laser 2, a light source coupling unit 3, a collimation module 4, a first plane mirror 401, a second plane mirror 402, a convex surface mirror 403, a concave surface mirror 404, a deflection unit 5, a deflection mirror 501, an installation frame 502, a first rotating base 503, a first rotating handle 504, a second rotating base 505, a second rotating handle 506, a reflecting mirror 6, a dichroic filter 7, an off-axis parabolic mirror 8, a detector 9 and an air medium to be detected 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1 to 3, the present invention provides a technical solution:
the long-optical-path infrared laser optical system comprises a host end and a reflection end, wherein the reflection end mainly comprises a reflector 6 and is used for reflecting infrared laser emitted by the host end and modulated visible laser, the host end and the reflection end are respectively positioned at two ends of an air medium to be detected and are arranged oppositely, the host end comprises an infrared laser 1, a visible laser 2, a light source coupling unit 3, a collimation module 4, a deflection unit 5, a dichroic sheet 7, an off-axis parabolic mirror 8 and a detector 9, and the infrared laser 1, the visible laser 2, the light source coupling unit 3, the collimation module 4, the deflection unit 5, the dichroic sheet 7, the off-axis parabolic mirror 8 and the detector 9 are all arranged inside a shell of the host end.
The infrared laser 1 is formed based on a quantum cascade laser and used as a laser light source to emit infrared laser outwards, the quantum cascade laser is an ideal infrared semiconductor laser light source at present and is a single-stage semiconductor light source based on electronic transition between conduction band and sub-band, an active region of the quantum cascade laser is formed by connecting coupled quantum wells in series in multiple stages and is manufactured by a molecular beam epitaxy method, the output wavelength is related to the thickness of the quantum wells in the active region and is not limited by laser materials, the detection sensitivity can be improved, the environmental monitoring requirement of a greenhouse gas region is met, the laser emitting direction of the infrared laser 1 faces to a light source coupling unit 3, visible light emitted by a visible laser 2 is green light with the wavelength range of 515-535 nm, a laser emitting port of the visible laser 2 faces to the light source coupling unit 3, the infrared laser 1 and the visible laser 2 respectively emit infrared laser and green visible laser and irradiate to the light source coupling single laser And the element 3, the infrared laser 1 and the visible laser 2 are positioned on the same side of the light source coupling unit 3.
The light source coupling unit 3 adopts a wedge-shaped dichroic mirror, an anti-reflection film is plated on the surface of the dichroic mirror, the optical transmittance is increased, the emergent direction faces the collimation module 4, infrared laser and visible laser are coupled into a beam of light to be emitted to the collimation module 4, the thickness of the dichroic mirror is 5mm, the wedge angle is 30 degrees, the problem of interference caused by light beams on the front surface and the rear surface of the dichroic mirror in a light path is effectively solved, the visible light and the infrared laser are coupled through the dichroic mirror, multi-wavelength light beam coupling is achieved, the infrared laser and visible light beams are coincided and emitted, when the light path of the infrared laser is judged by looking over the visible light through naked eyes, and debugging is facilitated.
The collimating module 4 comprises a first plane mirror 401, a second plane mirror 402, a convex mirror 403 and a concave mirror 404, the light source coupling unit 3 couples the outgoing direction of the light beam to face the first plane mirror 401, the first plane mirror 401 reflects the coupled light beam to the second plane mirror 402, the second plane mirror 402 reflects the coupled light beam to the convex mirror 403, the positions of the first plane mirror 401 and the second plane mirror 402 are set as required, the focal positions of the concave mirror 404 and the convex mirror 403 are overlapped, the convex mirror 403 reflects the coupled light beam to the concave mirror 404, the concave mirror 404 reflects the coupled light beam to the deflecting unit 5, the focal lengths of the concave mirror 404 and the convex mirror 403 are different, but in confocal arrangement, the reflecting surfaces of the convex mirror 403 and the concave mirror 404 are plated with a protective gold film or a silver film, the adaptive waveband range and the reflectivity thereof can be effectively enlarged.
The infrared laser emitted by the infrared laser 1 has a certain divergence angle, the diameter of the light spot becomes larger after the light beam is transmitted for a long distance, and the effective aperture far larger than the light receiving in actual measurement is limited, which results in effective light energy loss, the collimating module 4 mainly expands the light beam through the confocal concave reflector 404 and the confocal convex reflector 403, the receiving light power corresponding to the long optical path after expanding the light beam can be effectively improved than that before expanding the light beam, therefore, by adopting the optical machine structure, kilometer-level long optical path measurement can be realized, the problem that laser emitted by the infrared laser 1 has a certain divergence angle is solved by collimating the infrared laser through the collimating module 4, light beams can be reflected by the collimating module 4 to expand the beams, when long-distance long-optical-path transmission is carried out, the divergence angle of the light beam is reduced, the loss of effective light energy is avoided, and the diameter of the light spot is prevented from being enlarged after the light beam is transmitted for a long distance.
The emergent direction of the concave reflector 404 of the collimating module 4 faces to the deflecting unit 5, the deflecting unit 5 includes a deflecting reflector 501, an outer mounting frame 502, a first rotating seat 503, a first rotating handle 504, a second rotating seat 505 and a second rotating handle 506, the deflecting reflector 501 is located inside the outer mounting frame 502, one end of the deflecting reflector 501 is rotatably connected to the outer mounting frame 502 through the first rotating seat 503, the other end of the deflecting reflector 501 is rotatably mounted inside the outer mounting frame 502 through the first rotating handle 504, the outer side of the outer mounting frame 502 is mounted with the second rotating seat 505 and the second rotating handle 506, the directions of the first rotating seat 503 and the first rotating handle 504 are perpendicular to the directions of the second rotating seat 505 and the second rotating handle 506, the outer mounting frame 502 is rotatably mounted inside the main unit housing through the second rotating seat 505 and the second rotating handle 506, the first rotating handle 504 and the second rotating handle 506 extend to the outside of the host end shell, the deflecting mirror 501 can be rotated in two dimensions when the first rotating handle 504 and the second rotating handle 506 are rotated, the direction of the light beam reflected by the deflecting mirror 501 is adjusted, the emergent direction of the deflecting mirror 501 faces the mirror 6, and the emergent direction of the coupled light beam can be deflected and adjusted, so that the coupled light beam can accurately point to the mirror 6.
The reflecting mirror 6 is composed of an upper reflecting surface and a lower reflecting surface, an angle between the two reflecting surfaces is a right angle, a coupling light beam reflected by the deflecting reflecting mirror 501 penetrates through an air medium 10 to be detected, irradiates to the lower reflecting surface of the reflecting mirror 6, is reflected to the upper reflecting surface of the reflecting mirror 6 after being totally reflected by the lower reflecting surface, is reflected back after being totally reflected by the upper reflecting surface, the reflected light beam is parallel to the emitted light beam, the incident direction of the color separation sheet 7 faces the reflecting direction of the light beam of the reflecting mirror 6, the emitting direction of the infrared laser of the color separation sheet 7 faces the off-axis parabolic mirror 8, the color separation sheet 7 transmits an infrared spectrum segment, reflects green light of 515nm-535nm waveband, separates visible light for indication, reduces interference, only transmits the infrared laser when the reflected coupling light beam passes through the color separation sheet 7, the infrared laser is emitted to the off-axis parabolic mirror 8 through the color separation sheet 7, the exit direction of the off-axis parabolic mirror 8 faces the detector 9, the off-axis parabolic mirror 8 receives the reflected infrared laser, focuses and reflects the infrared laser into a light receiving port of the detector 9, and the focusing visual angle is considered, so that the focusing visual angle of the off-axis parabolic mirror 8 is within the receiving visual angle range of the detector 9.
The light receiving port of the detector 9 is located in the reflection direction of the infrared laser of the off-axis parabolic mirror 8, the detector 9 is based on an MCT infrared photoelectric detector and is matched with a data acquisition and processing device to form, the detector 9 distinguishes and analyzes the spectrum of the reflected infrared laser, and the quality of the air medium 10 to be detected can be known through analyzing the reflected spectrum due to the fact that certain gas components in the air absorb specific spectrum.
The use principle of the invention is as follows: the method comprises the steps that a host end and a reflection end are respectively oppositely arranged on two sides of an air medium 10 to be detected, an infrared laser 1 and a visible laser 2 respectively emit infrared laser and green visible light, the infrared laser and the green visible light are coupled into a beam of light through a light source coupling unit 3, the beam of light is collimated through a collimating module 4 and then reflected to a deflection unit 5, the deflection unit 5 deflects and adjusts the emergent direction of the coupled beam of light to enable the coupled beam of light to accurately point to the reflection end, the beam of light firstly passes through the air medium 10 to be detected to reach a reflector 6, the reflector 6 totally reflects the beam of light, then passes through the air medium 10 to be detected again to reach a color separation plate 7 on the host end, the color separation plate 7 reflects green light in a 515nm-535nm waveband through an infrared spectrum section, visible light for indication is separated, and the infrared laser is emitted to an off-axis parabolic mirror 8 through the color separation plate 7, the off-axis parabolic mirror 8 receives the reflected infrared laser, focuses and reflects the infrared laser into a light receiving port of the detector 9, and the detector 9 distinguishes and analyzes the spectrum of the reflected infrared laser and judges the quality of the air medium 10 to be detected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a long optical path infrared laser optical system, its characterized in that includes host computer end and reflection end, the reflection end mainly includes speculum (6) for the infrared laser that the reflection host computer end was launched and the visible laser of debugging, host computer end and reflection end are located respectively and wait to detect air medium both ends, and relative setting, the host computer end includes:
the infrared laser device (1), the laser emitting direction of the infrared laser device (1) faces the light source coupling unit (3), and the infrared laser device is used for emitting infrared laser and irradiating the light source coupling unit (3);
the laser irradiation port of the visible laser (2) faces the light source coupling unit (3) and is used for emitting visible laser to irradiate the light source coupling unit (3);
the light source coupling unit (3) is a wedge-shaped lens, the emergent direction of the wedge-shaped lens faces the collimation module (4), and the light source coupling unit is used for coupling infrared laser and visible laser into a beam of light;
the emergent direction of the collimation module (4) faces the deflection unit (5) and is used for collimating the coupled light beams and reducing the divergence angle of the light beams;
the emergent direction of the deflection unit (5) faces the reflector (6) and is used for deflecting and adjusting the emergent direction of the coupled light beam to enable the coupled light beam to accurately point to the reflector (6);
the exit direction of the infrared laser of the color separation sheet (7) faces the off-axis parabolic mirror (8), and the incident direction faces the reflection direction of the light beam of the reflector (6), and the color separation sheet is used for transmitting the infrared laser and reflecting the visible laser;
the exit direction of the off-axis parabolic mirror (8) faces to the detector (9) and is used for focusing the infrared laser after reflection treatment;
and a light receiving port of the detector (9) is positioned in the reflection direction of the infrared laser of the off-axis parabolic mirror (8) and is used for distinguishing and absorbing the focused infrared laser and carrying out spectral analysis to detect the quality of the gas in the air.
2. The long optical path infrared laser optical system according to claim 1, characterized in that: the light source coupling unit (3) adopts a wedge-shaped dichroic mirror, an antireflection film is coated on the surface of the dichroic mirror, and the infrared laser (1) and the visible laser (2) are positioned on the same side of the light source coupling unit (3).
3. The long optical path infrared laser optical system according to claim 1, characterized in that: the collimating module (4) comprises a first plane mirror (401), a second plane mirror (402), a convex mirror (403) and a concave mirror (404), the emergent direction of the coupled light beam of the light source coupling unit (3) faces the first plane mirror (401), the first plane mirror (401) reflects the coupled light beam to the second plane mirror (402), the second plane mirror (402) reflects the coupled light beam to the convex mirror (403), the focal positions of the concave mirror (404) and the convex mirror (403) are overlapped, the convex mirror (403) reflects the coupled light beam to the concave mirror (404), and the concave mirror (404) reflects the coupled light beam to the deflecting unit (5).
4. The long optical path infrared laser optical system according to claim 3, characterized in that: and the reflecting surfaces of the convex reflecting mirror (403) and the concave reflecting mirror (404) are plated with a protective gold film or a silver film.
5. The long optical path infrared laser optical system according to claim 3, characterized in that: the deflection unit (5) comprises a deflection mirror and a two-dimensional deflection platform, the deflection mirror is installed on the deflection platform, and the deflection platform is used for driving the deflection mirror to rotate in two dimensions.
6. The long optical path infrared laser optical system according to claim 1, characterized in that: the reflector (6) is composed of an upper reflecting surface and a lower reflecting surface, and the angle between the two reflecting surfaces is a right angle.
7. The long optical path infrared laser optical system according to claim 1, characterized in that: the focusing visual angle of the off-axis parabolic mirror (8) is within the receiving visual angle range of the detector (9).
8. The long optical path infrared laser optical system according to claim 1, characterized in that: the detector (9) is based on an MCT infrared photodetector.
9. The long optical path infrared laser optical system according to any one of claims 1 to 8, characterized in that: the infrared laser (1) is based on a quantum cascade laser, and visible light emitted by the visible laser (2) is green light with the wavelength range of 515-535 nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115372313A (en) * | 2022-10-21 | 2022-11-22 | 合肥金星智控科技股份有限公司 | Detection light path and detection system based on TDLAS technology |
| CN117504158A (en) * | 2024-01-08 | 2024-02-06 | 长春艾迪尔医用科技发展有限公司 | Laser optical system for laser pain relieving instrument |
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