CN219369553U - Long optical path absorption cell structure - Google Patents
Long optical path absorption cell structure Download PDFInfo
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- CN219369553U CN219369553U CN202320092373.0U CN202320092373U CN219369553U CN 219369553 U CN219369553 U CN 219369553U CN 202320092373 U CN202320092373 U CN 202320092373U CN 219369553 U CN219369553 U CN 219369553U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The utility model discloses a long-optical-path absorption cell structure, and belongs to the field of gas detection equipment; the absorption cell body comprises a first concave reflecting mirror and a second concave reflecting mirror which is arranged opposite to the first concave reflecting mirror; the first concave reflector is provided with a first light taper hole in a penetrating way, and the second concave reflector is provided with a second light taper hole in a penetrating way; the laser transmitter emits oblique light beams to be shot into the first light taper hole, and the light beams are reflected between the first concave reflector and the second concave reflector for multiple times until the light beams are shot into the second light taper hole. The beneficial effects are that: the laser transmitter is obliquely injected into the absorption tank shell, so that on one hand, multiple reflections are realized, and the sensitivity of gas detection is improved; in addition, the curvature of the reflecting concave surface of the first concave surface reflecting mirror is the same as that of the reflecting concave surface of the second concave surface reflecting mirror, and the reflecting concave surfaces are oppositely arranged, so that the processing cost can be reduced.
Description
Technical Field
The utility model relates to a long-optical-path absorption cell structure, and belongs to the field of gas detection equipment.
Background
The development of gas cells is based on optical gas absorption cell in tunable semiconductor laser absorption spectroscopy (TDLAS) technology; according to the development requirements of the TDLAS technology, the current gas absorption cell has the development trends of long optical path, miniaturization, easy operation, high stability and simultaneous measurement of various gases.
The long-optical-path gas cell is mainly applied to the fields of air pollution research, environmental monitoring, gas purity analysis, industrial production process monitoring, exhaust gas analysis, petroleum exploration geological logging process monitoring and the like;
the concrete structure in the prior art consists of a shockproof base, a tank body, a concave reflecting mirror, a plane reflecting mirror, a window sheet, a standard optical fiber connector, a gas inlet and outlet, a heating and refrigerating module, a temperature sensor, a pressure sensor and the like; the specific working mode is as follows: the base for preventing vibration of the tank body is arranged in the instrument box body, and gas to be tested enters the gas tank through the gas inlet and is discharged through the outlet. The light enters the spectrometer for analysis after passing through the gas to be detected, compared with the original background spectrum, the absorption spectrum is reduced, and the concentration of the gas is measured according to the Lambert-Beer absorption law. The number of reflections of light within the cell depends on the cell length, optical path length, and the associated optical design.
At present, a long-optical-path gas tank is a straight cylinder, the optical path of the straight cylinder absorption tank is limited, the percentage content level can only be measured, the application range of the absorption tank is limited, the tiny content can not be measured, leakage can not be found in advance in actual use, and unnecessary economic loss and explosion risk are caused.
For a long-optical-path white cell, more lenses are used, and 3-5 lenses are needed, for example, 2 lenses in a long-optical-path gas absorption Huai Techi of the Chinese patent application No. CN202121753361.5 are a plane mirror and a concave mirror; when the lens is used, low light is concentrated on one surface, the effective optical path is limited, the optical cavity is large, and the sensitivity and the working efficiency of the system are affected.
Disclosure of Invention
The utility model aims to provide a long-optical-path absorption cell structure which can effectively solve the problem of low working efficiency of the existing long-optical-path absorption cell.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model is applied to gas detection equipment, which comprises a laser emitter, a light source receiver and an absorption cell body; the absorption cell body comprises a first concave reflecting mirror and a second concave reflecting mirror which is arranged opposite to the first concave reflecting mirror; the first concave reflector is provided with a first light taper hole in a penetrating way, and the second concave reflector is provided with a second light taper hole in a penetrating way; the laser transmitter emits light beams which incline at a certain angle to be injected into the first light taper hole, and the light beams are reflected between the first concave reflecting mirror and the second concave reflecting mirror for multiple times until the light beams are injected into the second light taper hole.
Further: the first light taper hole is arranged at the edge position of the first concave reflecting mirror, and the axis of the first light taper hole is obliquely arranged; the second light cone is arranged at a position of the second concave reflector close to the edge.
Further: the first concave reflecting mirror and the second concave reflecting mirror have the same curvature of the reflecting concave, and the reflecting concave is arranged oppositely.
Further: and a fine adjustment mechanism is further arranged on the laser transmitter.
Further: the absorption cell comprises a first concave reflecting mirror, a second concave reflecting mirror and an absorption cell shell, wherein the absorption cell shell is provided with an air inlet and an air outlet.
Further: the absorption tank shell consists of a cylindrical barrel and discs which are arranged at two ends of the cylindrical barrel in a sealing mode.
Further: the stainless steel cutting sleeve joint, the stainless steel sealing valve and the 0-shaped rubber sealing ring are arranged at the positions of the air inlet and the air outlet.
Further: the disc is provided with an optical path inlet and an optical path outlet, and the optical path inlet and the optical path outlet are coupled by adopting an SMA905 standard optical fiber connector.
The beneficial effects are as follows:
the device has high sensitivity, low lower limit of detection concentration, stable structure and small cavity volume;
the laser transmitter is obliquely injected into the absorption tank shell, so that on one hand, multiple reflections are realized, and the sensitivity of gas detection is improved;
the first concave reflecting mirror and the second concave reflecting mirror have the same curvature of the reflecting concave, the reflecting concave is arranged oppositely, the first concave reflecting mirror and the second concave reflecting mirror have the same structure, and only the reflecting mirror is required to be processed during processing, and then the first light cone hole or the second light cone hole is arranged; compared with 3-5 reflectors in the prior art, the device only uses two reflectors, and the two reflectors are identical, and only have differences in mounting and fixing directions, so that the processing cost can be reduced.
Drawings
For ease of illustration, the utility model is described in detail by the following detailed description and the accompanying drawings.
Fig. 1 is a schematic structural view of the present utility model.
Reference numerals illustrate:
1. a first concave mirror; 2. a second concave mirror; 3. a laser emitter; 4. a light source receiver; 5. a first light cone hole; 6. a second light cone hole; 7. an absorption cell housing; 71. a cylinder barrel; 72. a disc; 8. an air inlet; 9. and an air outlet.
Detailed Description
Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
Referring to figure 1 which shows an embodiment of a long path absorption cell structure according to the present utility model,
the absorption cell housing 7 is composed of a cylindrical drum 71 and discs 72 hermetically arranged at both ends of the cylindrical drum 71, and forms a gas storage space; the first concave reflector 1 is arranged on one disc 72 in a fitting way, the second concave reflector 2 is arranged on the other disc 72 in a fitting way, and the concave surface of the first concave reflector 1 is opposite to the concave surface of the second concave reflector 2;
a first light taper hole 5 is formed in the first concave reflector 1 in a penetrating manner, and a second light taper hole 6 is formed in the second concave reflector 2 in a penetrating manner;
when the equipment needs to detect gas, the laser transmitter 3 and the light source receiver 4 are matched, the laser transmitter 3 emits oblique light beams to be injected into the first light taper hole 5, the light beams are reflected between the first concave reflector 1 and the second concave reflector 2 for multiple times until the light beams are injected into the second light taper hole 6 and finally received by the light source receiver 4, a photodiode is arranged in the light source receiver 4, the light beams are converted into electric signals by the diode, and the electric signals can be finally displayed at a PC end or other display terminals through amplification analysis calculation; and obtaining a gas concentration value.
In the using process of the device, the laser emitter 3 is obliquely injected into the absorption tank shell, so that on one hand, multiple reflection can be realized, and the sensitivity of gas detection is improved; in the device, the curvature of the reflecting concave surfaces of the first concave reflecting mirror 1 and the second concave reflecting mirror 2 is the same, the reflecting concave surfaces are arranged oppositely, the structures of the first concave reflecting mirror 1 and the second concave reflecting mirror 2 are the same, only the reflecting mirror is required to be processed during processing, and then the first light taper hole 5 or the second light taper hole 6 is arranged according to selection; compared with 3-5 reflectors in the prior art, the device only uses two reflectors, and the two reflectors are almost identical, so that the processing cost can be reduced.
FIG. 1 of the present apparatus is a schematic view of refraction being the beam direction; as shown in fig. 1, the specific optical path length can also be controlled by adjusting the concave curvatures of the first concave mirror 1 and the second concave mirror 2 and the distance between the first concave mirror 1 and the second concave mirror 2.
In the device, a fine adjustment mechanism is further arranged on the laser transmitter 3, the fine adjustment mechanism can conduct angle fine adjustment on the laser, and a collimated light beam emitted by the laser is emitted into the first light taper hole 5.
The device is also provided with a heating and refrigerating module and a temperature sensor, wherein the temperature sensor is used for detecting the temperature in the reflecting space and feeding back data to the heating and refrigerating module through the temperature sensor so as to ensure the stability of the measuring environment.
The stainless steel cutting sleeve joint, the stainless steel sealing valve and the 0-shaped rubber sealing ring are arranged at the inlet and the outlet of the air passage, so that the air passage has good sealing performance.
The light crossing is coupled by adopting an SMA905 standard optical fiber connector; the coupling performance of the light can be adjusted.
The first light taper hole 5 is arranged at a position close to the edge of the first concave reflector 1, and the axis of the first light taper hole 5 is obliquely arranged; the second conical aperture 6 is arranged at a position of the second concave mirror 2 close to the edge.
The positions of the first optical taper hole 5 and the second optical taper hole 6 are defined, and the axis of the first optical taper hole 5 is limited, so that the light beam is more concentrated.
The device also comprises an absorption cell shell 7 for loading the first concave reflecting mirror 1 and the second concave reflecting mirror 2, and an air inlet 8 and an air outlet 9 are arranged on the absorption cell shell 7.
The gas inlet 8 and the gas outlet 9 are both arranged at the upper end of the middle absorption tank shell 7, the gas inlet 8 is used for adding gas, and the gas outlet 9 is used for outputting gas; the stainless steel cutting ferrule joints, the stainless steel sealing valves and the 0-shaped rubber sealing rings are arranged at the positions of the air inlet 8 and the air outlet 9, so that the tightness of the device can be improved.
The above embodiments are merely illustrative embodiments of the present utility model, but the technical features of the present utility model are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present utility model are included in the scope of the present utility model.
Claims (6)
1. A long optical path absorption cell structure is applied to a gas detection device, and the gas detection device comprises a laser emitter (3), a light source receiver (4) and an absorption cell body; the method is characterized in that: the absorption cell body comprises a first concave reflecting mirror (1) and a second concave reflecting mirror (2) which is arranged opposite to the first concave reflecting mirror (1); the first concave reflecting mirror (1) is provided with a first light taper hole (5) in a penetrating way, and the second concave reflecting mirror (2) is provided with a second light taper hole (6) in a penetrating way; the laser transmitter (3) emits inclined light beams to be injected into the first light taper hole (5), and the light beams are reflected between the first concave reflecting mirror (1) and the second concave reflecting mirror (2) for multiple times until the light beams are injected into the second light taper hole (6).
2. The long optical path absorption cell structure according to claim 1, wherein: the first light taper hole (5) is arranged at the position, close to the edge, of the first concave reflecting mirror (1), and the second light taper hole (6) is arranged at the position, close to the edge, of the second concave reflecting mirror (2).
3. The long optical path absorption cell structure according to claim 2, wherein: the first concave reflecting mirror (1) and the second concave reflecting mirror (2) have the same curvature of the reflecting concave, and the reflecting concave is arranged oppositely.
4. The long optical path absorption cell structure according to claim 1, wherein: and a fine adjustment mechanism is further arranged on the laser emitter (3).
5. The long optical path absorption cell structure according to claim 1, wherein: the absorption cell comprises a first concave reflecting mirror (1) and a second concave reflecting mirror (2), and is characterized by further comprising an absorption cell shell (7) for loading the first concave reflecting mirror (1) and the second concave reflecting mirror (2), wherein an air inlet (8) and an air outlet (9) are arranged on the absorption cell shell (7).
6. The long path absorption cell structure according to claim 5, wherein: the absorption tank shell (7) is composed of a cylindrical barrel (71) and discs (72) which are arranged at two ends of the cylindrical barrel (71) in a sealing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320092373.0U CN219369553U (en) | 2023-01-31 | 2023-01-31 | Long optical path absorption cell structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320092373.0U CN219369553U (en) | 2023-01-31 | 2023-01-31 | Long optical path absorption cell structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219369553U true CN219369553U (en) | 2023-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320092373.0U Active CN219369553U (en) | 2023-01-31 | 2023-01-31 | Long optical path absorption cell structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219369553U (en) |
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2023
- 2023-01-31 CN CN202320092373.0U patent/CN219369553U/en active Active
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