CN218629455U - High-temperature long-optical-path air chamber structure - Google Patents
High-temperature long-optical-path air chamber structure Download PDFInfo
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- CN218629455U CN218629455U CN202221781668.0U CN202221781668U CN218629455U CN 218629455 U CN218629455 U CN 218629455U CN 202221781668 U CN202221781668 U CN 202221781668U CN 218629455 U CN218629455 U CN 218629455U
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Abstract
The utility model discloses a long optical path air chamber structure of high temperature. The device comprises an incident end component, a light path component, a gas chamber tube component and a heating component; the incident end assembly comprises a photoelectric sensor, a sensor mounting plate and a sensor adjusting plate, the light path assembly comprises a window lens frame, an incident end support, an incident end concave mirror, a lens compression nut, a light path pipe, a reflecting end concave mirror and a lens compression nut, the air chamber pipe assembly comprises an air chamber pipe sealing O-shaped ring and an air chamber pipe, and the heating assembly comprises heat insulation cotton, a heating ring and a heating rod.
Description
Technical Field
The utility model relates to a gaseous analysis technical field based on tunable semiconductor laser absorption spectrum of TDLAS especially relates to a long optical path air chamber structure of high temperature.
Background
The gas component analysis technology based on gas absorption spectrum has been widely applied in various fields of production and life, and the working principle is that light beams with specific wavelengths penetrate through the gas to be detected, and the attenuation of light intensity and the concentration of the gas meet the lambert beer's theorem, so that the concentration of the gas to be detected can be obtained through the analysis of the attenuation information of the detected light intensity, including an ultraviolet differential absorption spectrum gas analysis technology, a non-dispersive infrared gas analysis technology, a tunable semiconductor laser absorption spectrum gas analysis Technology (TDLAS) and the like. The TDLAS tunable semiconductor laser absorption spectrum gas analysis technology is different from the traditional infrared spectrum absorption technology in that a light source spectral band adopted by the traditional non-dispersive infrared spectrum absorption technology is very wide, besides an absorption spectral line of a gas to be detected, absorption spectral lines of other background gases exist in the spectral width range, and light emitted by a light source is absorbed by the background gases besides the absorption spectral lines of the gas to be detected, so that the measurement inaccuracy is caused. The laser absorption spectrum width of the TDLAS tunable semiconductor is far smaller than the broadening of a gas absorption spectrum line, and a laser gas analyzer adopting the semiconductor laser absorption spectrum technology can resist the interference of background gas in principle and is very suitable for the measurement of ppm-level trace gas.
According to the lambert beer's theorem, the gas absorption intensity is proportional to the optical path, the TDLAS technique is often used in conjunction with a long-optical-path gas cell in order to obtain a lower detection limit, and the herriott cell is used as a typical long-optical-path gas cell, and is widely used due to its simple structure and stable and reliable optical path. However, practical problems also occur in the use process, for example, in field application, the reflection lens installed in the air chamber is difficult to avoid pollution after a period of time, the optical path structure is often influenced when the lens installed in the air chamber is cleaned, and the optical path needs to be readjusted after the cleaning is finished, which causes difficulty in field maintenance; in the measurement of many gases, need heat the gas chamber in order to prevent the emergence of absorption, condensation, but the gas chamber can take place to expand after the heating and produce deformation, influences the stability of former Herriott cell light path, and then causes the influence to measuring stability, makes the instrument measuring error increase.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an: the high-temperature long-optical-path air chamber structure is provided, and optical path structure components do not need to be disassembled when the reflecting lens in the air chamber is maintained, so that the optical path is prevented from being influenced, and the field lens maintenance is feasible; after the air chamber is heated, the expansion of the air chamber tube assembly cannot influence the light path assembly, and the light path assembly freely stretches within an allowable range, so that the influence on the stability in application is avoided.
In order to realize the purpose, the utility model adopts the following technical scheme: a high-temperature long-optical-path air chamber structure comprises an incident end component, an optical path component, an air chamber tube component and a heating component; the light path component comprises a focusing lens, a wedge mirror frame, a wedge mirror, a sealing ring, an incident end concave mirror, an incident end gasket, an incident end pressing nut, a light path pipe, a reflecting end concave mirror, a reflecting end pressing nut, a reflecting end gasket and a reflecting mirror mounting seat. The air chamber pipe assembly comprises an air chamber pipe, an air chamber pipe heat insulation gasket and a reflection end support, and the heating assembly comprises an electric heating pipe, an emission end supporting seat and an electric heating ring.
As a further description of the above technical solution: the photoelectric sensor is fixed on the sensor PCB mounting plate, the sensor PCB mounting plate is fixed on the photoelectric sensor mounting plate, the photoelectric sensor mounting plate is fixed on the three-jaw S-shaped elastic adjusting plate, and the three-jaw S-shaped elastic adjusting plate is fixed on the transmitting end supporting seat.
As a further description of the above technical solution: the window lens and the frame form a window frame, and the window frame is fixed on the transmitting end supporting seat.
As a further description of the above technical solution: the incident end concave mirror is arranged on the transmitting end supporting seat through an incident end gasket and an incident end compression nut.
As a further description of the above technical solution: the optical path pipe is installed on the transmitting end supporting seat through threads, one end of the integrated optical path pipe is fixed, and the other end of the integrated optical path pipe is free and plays a role in stabilizing an optical path. The split mode makes the lens cleaning and maintenance feasible.
As a further description of the above technical solution: the reflecting end concave mirror is arranged on the reflecting mirror mounting seat through a reflecting end pressing nut and a reflecting end gasket, and the reflecting mirror mounting seat is fixed on the optical path tube.
The air chamber pipe assembly is installed on the transmitting end supporting seat through threads, the connecting seal adopts an O-shaped ring axial sealing mode, the other end of the air chamber pipe assembly is installed on the reflecting end support through an elastic check ring, a telescopic space is reserved, and the influence of overall thermal expansion on a light path is reduced.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. when the light path is adjusted, the incident angle of incident light can be adjusted by adjusting three screws for connecting the photoelectric sensor PCB mounting plate and the three-jaw S-shaped elastic adjusting plate and by elastic deformation of three S-shaped supporting points on the three-jaw S-shaped elastic adjusting plate, so that the aim is fulfilled.
2. When the reflection lens in the air chamber is maintained, the light path components of which the two ends are related to the light path do not need to be disassembled, but only the air chamber tube component is disassembled from the transmitting end supporting seat, and because the air chamber tube component and the light path components are protected and isolated mutually, no stress is generated during connection, the original light path cannot be influenced by assembly errors and stress variation during disassembly, and therefore the field lens maintenance is feasible.
3. After heating the air chamber subassembly through heating element, the air chamber pipe can produce the expansion and elongation in the axial, nevertheless because the air chamber pipe can freely stretch out and draw back along the axial, so the structural stress that its flexible production can not be acted on the relevant subassembly of herriott cell light path to the stability of influence light path has been avoided.
Compared with the prior art, the beneficial effects of the utility model are that: the high-temperature long-optical-path air chamber structure is simple in structure, the optical path is separated from the air chamber pipe, the optical path is simple and convenient to adjust, and the optical path structure component does not need to be disassembled when the reflection lens in the air chamber is maintained, so that the optical path is prevented from being influenced, and the field lens maintenance is feasible; after the air chamber is heated, the expansion of the air chamber component can not stress the light path structural member, thereby avoiding influencing the stability of the light path.
Drawings
Fig. 1 shows a schematic structural diagram provided according to an embodiment of the present invention.
Illustration of the drawings:
1. a protective cover; 2. a photoelectric sensor and a PCB thereof; 3. a photoelectric sensor PCB mounting plate; 4. a light source collimating mirror; 5. a three-jaw S-shaped elastic adjusting plate; 6. a focusing lens; 7. a wedge mirror frame; 8. a wedge mirror; 9. a seal ring; 10. an incident end concave mirror; 11. an incident end gasket; 12. the incident end compresses the nut; 13. an optical path tube; 14. a reflective-end concave mirror; 15. the reflecting end compresses the nut; 16. a reflective end gasket; 17. a reflector mount; 18. an air chamber tube; 19. an air chamber tube heat insulating gasket; 20. a reflective end support; 21. an electric heating tube; 22. a transmitting end supporting seat; 23. an electric heating tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a high-temperature long-optical-path gas chamber structure comprises an incident end component a, a gas chamber tube component b, a reflecting end component c, a heating component d and a bottom mounting plate.
Specifically, the incident end assembly a comprises a protective cover 1, a photoelectric sensor and a PCB2 thereof, a photoelectric sensor PCB mounting plate 3, a light source collimating mirror 4 and a three-jaw S-shaped elastic adjusting plate 5. The protective cover 1 is fixed on the photoelectric sensor PCB mounting plate 3, the photoelectric sensor is welded on the sensor PCB to form the photoelectric sensor and the PCB2 thereof, the photoelectric sensor and the PCB2 thereof are fixed on the photoelectric sensor mounting plate 3, and the photoelectric sensor mounting plate 3 is fixed on the three-jaw S-shaped elastic adjusting plate 5.
Specifically, the optical path component b includes a focusing lens 6, a wedge frame 7, a wedge 8, a seal ring 9, an incident end concave mirror 10, an incident end gasket 11, an incident end compression nut 12, an optical path tube 13, a reflecting end concave mirror 14, a reflecting end compression nut 15, a reflecting end gasket 16, and a reflector mounting seat 17. The lens 6 is adhered to the photoelectric sensor mounting plate 3 through a special adhesive, the wedge lens 8 is adhered to the wedge lens frame 7 through a special adhesive, fixed on the transmitting end supporting seat 22 through a screw, and sealed with the transmitting end supporting seat 22 through a sealing ring 9. The incident-side concave mirror 10 is mounted on the emission-side support base 22 through an incident-side washer 11 and an incident-side pressing nut 12. The light path pipe 13 is fixed to the emitting end support base 22. The reflection end concave mirror 14 is mounted on the mirror mounting base 17 through a reflection end compression nut 15 and a reflection end washer 16. The mirror mount 17 is fixed to the optical path tube 13.
Specifically, the plenum tube assembly c comprises a plenum tube 18, a plenum tube heat insulation gasket 19 and a reflection end bracket 20. The air chamber pipe heat insulation gasket 19 is fixed on the emission end bracket 20 through screws, and the air chamber pipe 18 is mounted on the emission end bracket 20 through a circlip.
Specifically, the heating assembly d includes an electrothermal tube 21, an emitting end support 22, and an electrothermal ring 23. The electrothermal tube 21 is coated with heat-conducting silica gel and then is arranged on the emission end supporting seat 22, and the electrothermal ring 23 is sleeved on the air chamber tube 18 through self elasticity.
Preferably, the photoelectric sensor is welded on the sensor PCB to form the photoelectric sensor and the PCB2 thereof, the photoelectric sensor and the PCB2 thereof are fixed on the photoelectric sensor mounting plate 3, the photoelectric sensor mounting plate 3 is fixed on the three-jaw S-shaped elastic adjusting plate 5, and when the light path is adjusted, the incident angle of incident light can be adjusted by adjusting three screws connecting the photoelectric sensor PCB mounting plate and the three-jaw S-shaped elastic adjusting plate through elastic deformation of three S-shaped supporting points on the three-jaw S-shaped elastic adjusting plate.
Preferably, the air chamber tube assembly is mounted on the emitter end support base 22 by means of a screw thread, the connection seal is an O-ring axial seal, and the other end is mounted on the reflector end support 20 by means of a circlip. The telescopic space is reserved, and the influence of the whole thermal expansion on the light path is reduced
Preferably, the optical path tube 13 is installed on the transmitting end supporting seat 22 through a thread, one end of the integrated optical path tube 13 is fixed, and the other end is free, and a telescopic space is reserved, so that the influence of the whole thermal expansion on the optical path is reduced.
Preferably, the electric heating tube 21 is coated with heat conductive silica gel and then mounted on the emitting end support seat 22, and the electric heating ring 23 is elastically sleeved on the air chamber tube 18 by itself. The sectional heating mode ensures that the whole temperature is uniformly distributed.
The working principle is as follows: the modulated laser beam is collimated by the collimating mirror 4, then enters the optical cell through the wedge mirror 8, enters the optical cell through the through hole on the concave mirror 10 at the entrance end, is reflected for multiple times in the optical cell, and then exits through the through hole on the concave mirror 10 at the entrance end and the wedge mirror 8, the emergent light hits the photoelectric sensor, and the photoelectric sensor converts the optical signal into an electrical signal to be output. When the reflecting lens in the air chamber is maintained, the optical path component does not need to be disassembled, and only the transmitting end supporting seat 22 of the c-shaped air chamber tube component needs to be disassembled, and the original optical path is not influenced due to the fact that the air chamber tube component is connected with the optical path component in an unstressed mode due to stress change generated during disassembly, and therefore the field lens maintenance is feasible. After the air chamber component is heated by the heating component, the air chamber pipe can generate expansion and elongation in the axial direction, but because the air chamber pipe can freely stretch and retract along the axial direction, the structural stress generated by stretching of the air chamber pipe cannot act on the relevant component of the light path, and therefore the stability of the light path is prevented from being influenced.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (2)
1. A high-temperature long-optical-path gas chamber structure comprises an incident end component a, an optical path component b, a gas chamber tube component c and a heating component d, and is characterized in that: the incident end assembly a comprises a protective cover (1), a photoelectric sensor and a PCB (2) thereof, a photoelectric sensor PCB mounting plate (3), a light source collimating mirror (4) and a three-claw S-shaped elastic adjusting plate (5);
the protective cover (1) is fixed on the photoelectric sensor PCB mounting plate (3), the photoelectric sensor is welded on the sensor PCB to form the photoelectric sensor and the photoelectric sensor PCB (2), the photoelectric sensor and the photoelectric sensor PCB (2) are fixed on the photoelectric sensor PCB mounting plate (3), and the photoelectric sensor PCB mounting plate (3) is fixed on the three-jaw S-shaped elastic adjusting plate (5);
the light path component b comprises a focusing lens (6), a wedge frame (7), a wedge (8), a sealing ring (9), an incident end concave mirror (10), an incident end gasket (11), an incident end compression nut (12), a light path tube (13), a reflecting end concave mirror (14), a reflecting end compression nut (15), a reflecting end gasket (16) and a reflecting mirror mounting seat (17);
the wedge mirror (8) is adhered to the wedge mirror frame (7) through a special adhesive, fixed on the transmitting end supporting seat (22) and sealed with the transmitting end supporting seat (22) through a sealing ring (9);
the incident end concave mirror (10) is arranged on the transmitting end supporting seat (22) through an incident end gasket (11) and an incident end pressing nut (12);
the reflecting end concave mirror (14) is arranged on the reflecting mirror mounting seat (17) through a reflecting end pressing nut (15) and a reflecting end gasket (16);
the air chamber pipe assembly c comprises an air chamber pipe (18), an air chamber pipe heat insulation gasket (19) and a reflection end bracket (20);
the air chamber pipe heat insulation gasket (19) is fixed on the transmitting end support (20), and the air chamber pipe is arranged on the reflecting end support (20) through an elastic retainer ring;
the heating component d comprises an electrothermal tube (21), an emitting end supporting seat (22) and an electrothermal ring (23);
the electric heating tube d is arranged on the support seat (22) of the emitting end, and the electric heating coil (23) is arranged on the air chamber tube (18).
2. A high temperature long optical path gas chamber structure as claimed in claim 1, wherein the focusing lens (6) is adhered to the photoelectric sensor PCB mounting board (3) by a special adhesive, the optical path tube (13) is fixed on the emission end supporting base (22), and the reflector mounting base (17) is fixed on the optical path tube (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221781668.0U CN218629455U (en) | 2022-07-11 | 2022-07-11 | High-temperature long-optical-path air chamber structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221781668.0U CN218629455U (en) | 2022-07-11 | 2022-07-11 | High-temperature long-optical-path air chamber structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218629455U true CN218629455U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221781668.0U Active CN218629455U (en) | 2022-07-11 | 2022-07-11 | High-temperature long-optical-path air chamber structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218629455U (en) |
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2022
- 2022-07-11 CN CN202221781668.0U patent/CN218629455U/en active Active
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