Device for detecting trace gas under strong spectrum background interference

By using a spectroscope in the laser absorption spectroscopy method to split the laser into two beams and detect the trace gas and background gas concentrations respectively, the problem of trace gas detection accuracy under strong spectral background interference is solved, and higher detection accuracy is achieved.

CN223389646UActive Publication Date: 2025-09-26WUHAN MIZI ENERGY SCI & TECH CO LTD
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Patent Information

Application Number
CN202422711861.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-07
Publication Date
2025-09-26
Estimated Expiration
2034-11-07

AI Technical Summary

Technical Problem

In the laser absorption spectroscopy method, there are accuracy issues in trace gas detection under strong spectral background interference, and existing technologies cannot effectively avoid the influence of background gas concentration changes.

Method used

A spectroscope is used to split the laser into two beams. One beam enters a long optical path cell to detect trace gas concentration, and the other enters a short optical path cell to monitor background gas concentration. The detection signal is inferred through a spectral model and the background signal is subtracted to extract the spectral curve of the gas to be tested.

Benefits of technology

It effectively solves the background interference problem, improves the accuracy of trace gas detection, and ensures that the detection results are not affected by changes in background gas concentration.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a trace gas detection device under strong spectrum background interference, which comprises a shell, a cavity is arranged in the shell, one end of the cavity is fixedly connected with a first plane-concave mirror, the first plane-concave mirror is fixedly connected with a plane mirror, the other end of the cavity is fixedly connected with a second plane-concave mirror, and the plane mirror is fixedly connected with the second plane-concave mirror. A window mirror is arranged on one side of the second plano-concave mirror, and a third photosensitive detector is arranged on one side of the window mirror; a background gas detection light path and a trace gas detection light path are constructed, laser is divided into two beams through a spectroscope, the two beams enter a long optical path pool and a short optical path pool respectively, the trace gas concentration and the background gas concentration are detected according to the two beams, and the detected background gas concentration can be substituted into a spectrum model to reversely deduce a detection signal. And the real-time detection signal is used for deducting the inversion background signal to extract the spectrum curve of the gas to be detected, so that the spectrum curve is not influenced by the concentration change of the background gas, the background interference problem is effectively solved, and the trace gas detection precision is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a device for detecting trace gases under strong spectral background interference. Background Art

[0002] In laser absorption spectroscopy, trace gas detection primarily occurs in the 1-2 μm wavelength band, where strong background interference often exists. This background interference is often more than two orders of magnitude greater than that of the analyte, such as when measuring hydrogen sulfide against a methane background. Existing techniques employ calibration and fitting to mitigate background interference, but changes in background gas concentration often alter measurement results, leading to inaccurate gas detection results. Therefore, a device for trace gas detection in the presence of strong spectral background interference was proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a device for detecting trace gases under strong spectral background interference, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: A device for detecting trace gases under strong spectral background interference, comprising a shell, a cavity is arranged in the shell, one end of the cavity is fixedly connected to a first plano-concave mirror, a plane mirror is fixedly connected to the first plano-concave mirror, the other end of the cavity is fixedly connected to a second plano-concave mirror, a window mirror is arranged on one side of the second plano-concave mirror, a third photosensitive detector is arranged on one side of the window mirror, a reflector is arranged on one side of the third photosensitive detector, a spectrometer is arranged on the top of the reflector, a second photosensitive detector is arranged on the top of the spectrometer, a reference gas chamber is arranged on one side of the spectrometer, a first photosensitive detector is arranged on one side of the reference gas chamber, a collimating lens is arranged on the bottom of the reference gas chamber, and the collimating lens is arranged on one side of the spectrometer, and a light-emitting diode is arranged on one side of the collimating lens.

[0005] Preferably, one side of the cavity is conductively connected to a first accommodating groove, and the first plano-concave mirror is fixedly connected in the first accommodating groove.

[0006] Preferably, a first end cover is provided on one side of the first plano-concave mirror, and the first end cover is fixedly connected to the housing.

[0007] Preferably, the other side of the cavity is conductively connected to a second accommodating groove, and the second plano-concave mirror is fixedly connected to the second accommodating groove, a second end cover is provided on one side of the second plano-concave mirror, and the second end cover is fixedly connected to the shell, a first mounting seat is fixedly connected to the second end cover, a first mounting hole is provided on the first mounting seat, and the light-emitting diode is fixedly connected to one end of the first mounting hole, a collimating lens is fixedly connected to the other end of the first mounting hole, a second mounting hole is provided at the top of the first mounting hole, and the first photosensitive detector is fixedly connected to one end of the second mounting hole, a reference gas chamber is fixedly connected to the other end of the second mounting hole, a second mounting seat is fixedly connected to the first mounting seat, and the spectrometer, the second photosensitive detector, the reflector and the third photosensitive detector are all fixedly connected to the second mounting seat, a third mounting seat is fixedly connected to the second mounting seat, and the window mirror is fixedly connected to the third mounting seat.

[0008] Preferably, a first bracket is fixedly connected to the first mounting seat, and the spectrometer and the third photosensitive detector are both fixedly connected to the first bracket, a second bracket is fixedly connected to the first mounting seat, and the reflector is fixedly connected to the second bracket, a third bracket is fixedly connected to the third mounting seat, and the window mirror is fixedly connected to the third bracket.

[0009] Preferably, the second plano-concave mirror is provided with a first exit hole, a first entrance hole is provided at the bottom of the first exit hole, a second exit hole is provided at the bottom of the first entrance hole, and a second entrance hole is provided at the bottom of the second exit hole.

[0010] Preferably, two threaded holes are provided in the cavity, and the threaded holes are threadedly connected with trachea joints.

[0011] Preferably, a first positioning hole is provided on the first mounting seat, a first positioning block is sleeved in the first positioning hole, and the first positioning block is fixedly connected to the second mounting seat, a second positioning hole is provided on the second mounting seat, a second positioning block is sleeved in the second positioning hole, and the second positioning block is fixedly connected to the third mounting seat.

[0012] The utility model provides a device for detecting trace gases under strong spectral background interference, which has the advantages that: the utility model constructs a background gas detection optical path and a trace gas detection optical path, divides the laser into two beams by a spectroscope, and makes them enter a long optical path cell and a short optical path cell respectively, thereby detecting the trace gas concentration and the background gas concentration; after the background gas concentration is measured, it can be brought into the spectral model to infer the detection signal, and then the real-time detection signal is used to deduct the inverted background signal to extract the spectral curve of the gas to be measured, so that it is not affected by the change of background gas concentration, thereby effectively solving the background interference problem and improving the trace gas detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of the overall main cutaway structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the three-dimensional cutaway structure of the shell of the present utility model;

[0017] Figure 4 This is a schematic diagram of the main cross-sectional structure of the second plano-concave mirror of the present invention;

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the first mounting base of the utility model;

[0019] Figure 6 It is a schematic diagram of the three-dimensional structure of the second mounting base of the utility model.

[0020] In the figure: 1, housing; 11, cavity; 12, threaded hole; 13, tracheal joint; 14, first receiving groove; 15, first plano-concave mirror; 16, plane mirror; 17, first end cap; 18, second receiving groove; 19, second plano-concave mirror; 110, first exit hole; 111, first entrance hole; 112, second exit hole; 113, second entrance hole; 114, second end cap; 2, first mounting seat; 21, first mounting hole; 22, light-emitting diode; 23, collimating lens Mirror; 24, second mounting hole; 25, first photodetector; 26, reference gas chamber; 27, second mounting seat; 28, spectrometer; 29, second photodetector; 210, reflector; 211, third photodetector; 212, third mounting seat; 213, window mirror; 214, first positioning hole; 215, first positioning block; 216, second positioning hole; 217, second positioning block; 218, first bracket; 219, second bracket; 220, third bracket. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please see the attached Figure 1 -Attached Figure 6 The present invention provides an embodiment of a device for detecting trace gases under strong spectral background interference, comprising a housing 1, a cavity 11 being provided in the housing 1, a first plano-concave mirror 15 being fixedly connected to one end of the cavity 11, a plane mirror 16 being fixedly connected to the first plano-concave mirror 15, a second plano-concave mirror 19 being fixedly connected to the other end of the cavity 11, a window mirror 213 being provided on one side of the second plano-concave mirror 19, a third photosensitive detector 211 being provided on one side of the window mirror 213, and a third photosensitive detector 211 being provided on one side of the third photosensitive detector 211. There is a reflector 210, a spectroscope 28 is provided on the top of the reflector 210, a second photosensitive detector 29 is provided on the top of the spectroscope 28, a reference gas chamber 26 is provided on one side of the spectroscope 28, a first photosensitive detector 25 is provided on one side of the reference gas chamber 26, a collimating lens 23 is provided on the bottom of the reference gas chamber 26, and the collimating lens 23 is provided on one side of the spectroscope 28, a light emitting diode 22 is provided on one side of the collimating lens 23, and the optical path of the trace gas detection is: the laser is split by the spectroscope 28, and is reflected by the reflector 210. The light is incident on the window mirror 213, enters the second incident hole 113 through the window mirror 213, enters the long optical path pool, is reflected multiple times between the first plano-concave mirror 15 and the second plano-concave mirror 19, and finally is emitted from the second exit hole 112 and irradiates the third photosensitive detector 211; the background gas detection optical path is as follows: the laser is split by the spectrometer 28, enters the first incident hole 111 through the window mirror 213, enters the short optical path pool, is reflected by the plane mirror 16, and is emitted from the first exit hole 110, and then is split into two by the spectrometer 28, one of which is directly The second photosensitive detector 29 collects and obtains the background gas concentration, and the other beam of light passes through the reference gas chamber 26 and is received by the first photosensitive detector 25, which is the reference light path; one side of the cavity 11 is connected to the first accommodating groove 14, and the first plano-concave mirror 15 is fixedly connected to the first accommodating groove 14, and the first accommodating groove 14 is used to accommodate the first plano-concave mirror 15; a first end cover 17 is provided on one side of the first plano-concave mirror 15, and the first end cover 17 is fixedly connected to the shell 1, and the first end cover 17 is used to support and fix the first plano-concave mirror 15.

[0023] The other side of the cavity 11 is connected to the second receiving groove 18, and the second plano-concave mirror 19 is fixedly connected to the second receiving groove 18. A second end cover 114 is provided on one side of the second plano-concave mirror 19, and the second end cover 114 is fixedly connected to the shell 1. The first mounting seat 2 is fixedly connected to the second end cover 114. The first mounting seat 2 is provided with a first mounting hole 21, and the light-emitting diode 22 is fixedly connected to one end of the first mounting hole 21. The collimating lens 23 is fixedly connected to the other end of the first mounting hole 21. The top of the first mounting hole 21 is provided with a second mounting hole 24, and the first photosensitive detector The device 25 is fixedly connected to one end of the second mounting hole 24, the reference air chamber 26 is fixedly connected to the other end of the second mounting hole 24, the second mounting seat 2 is fixedly connected to the second mounting seat 27, and the spectrometer 28, the second photosensitive detector 29, the reflector 210 and the third photosensitive detector 211 are all fixedly connected in the second mounting seat 27, the second mounting seat 27 is fixedly connected to the third mounting seat 212, and the window mirror 213 is fixedly connected in the third mounting seat 212, the second accommodating groove 18 is used to accommodate the second plano-concave mirror 19, and the second end cover 114 is used to support and fix the second plano-concave mirror 19.

[0024] The first mounting hole 21 on the first mounting seat 2 is used to install the light-emitting diode 22 and the collimating lens 23, and the second mounting hole 24 is used to install the first photosensitive detector 25 and the reference gas chamber 26; the second mounting seat 27 is used to install the spectroscope 28, the second photosensitive detector 29, the reflector 210 and the third photosensitive detector 211, and the third mounting seat 212 is used to install the window mirror 213; the first mounting seat 2 is fixedly connected to the first bracket 218, and the spectroscope 28 and the third photosensitive detector 211 are fixedly connected to the first bracket 218. The second bracket 219 is fixedly connected to the second bracket 219, and the reflector 210 is fixedly connected to the second bracket 219. The third bracket 220 is fixedly connected to the third mounting seat 212, and the window mirror 213 is fixedly connected to the third bracket 220. The first bracket 218 is used to install the spectrometer 28 and the third photosensitive detector 211. The second bracket 219 is used to install the reflector 210. The third bracket 220 is used to install the window mirror 213. The second plano-concave mirror 19 is provided with a first exit hole 110. The bottom end of the first exit hole 110 is provided with a first incident hole 111. The first incident hole 111 is provided with a first incident hole 111. The bottom of the hole 111 is provided with a second exit hole 112, and the bottom of the second exit hole 112 is provided with a second entrance hole 113. The first exit hole 110 and the first entrance hole 111 are through holes for the laser to enter and exit the short optical path pool, and the second exit hole 112 and the second entrance hole 113 are through holes for the laser to enter and exit the long optical path pool; two threaded holes 12 are provided in the cavity 11, and the threaded holes 12 are connected with the trachea connector 13, and the threaded holes 12 are used to install the trachea connector 13, and the trachea connector 13 is used to connect the trachea; the first mounting seat 2 is provided with a first positioning hole 214, and the first positioning hole 215 is provided with a first positioning hole 216. A first positioning block 215 is sleeved in the hole 214, and the first positioning block 215 is fixedly connected to the second mounting seat 27. A second positioning hole 216 is provided on the second mounting seat 27. A second positioning block 217 is sleeved in the second positioning hole 216, and the second positioning block 217 is fixedly connected to the third mounting seat 212. The first positioning hole 214 cooperates with the first positioning block 215 to achieve positioning between the first mounting seat 2 and the second mounting seat 27. The second positioning hole 216 cooperates with the second positioning block 217 to achieve positioning between the third mounting seat 212 and the second mounting seat 27.

[0025] Working principle: When using the present invention, the light emitting diode 22 emits a laser, which is irradiated on the beam splitter 28 through the collimating lens 23. The beam splitter 28 splits the laser into two beams. One beam is reflected by the reflector 210 to the window mirror 213, enters the second incident hole 113 through the window mirror 213, enters the long optical path pool, is reflected multiple times between the first plano-concave mirror 15 and the second plano-concave mirror 19, and finally is emitted from the second exit hole 112 and irradiates the third photosensitive detector 211 for detecting the concentration of trace gases; the other beam enters the first incident hole 111 through the window mirror 213, enters the short optical path pool, is reflected by the plane mirror 16 and then exits from the first The light is emitted from the exit hole 110 and then split into two by the spectroscope 28. One beam is directly collected by the second photosensitive detector 29 to obtain the background gas concentration, and the other beam is received by the first photosensitive detector 25 after passing through the reference gas chamber 26. This branch is used to monitor the light intensity and wavelength self-stabilization of the laser. When the background gas concentration is measured, it can be brought into the spectrum model to infer the detection signal; the spectrum curve of the gas to be detected can be extracted by deducting the inverted background signal from the real-time detection signal, so that it is not affected by the change of background gas concentration; wherein, the cavity 11 in the shell 1 is used to accommodate the gas to be detected, and the threaded hole 12 is used to install the gas pipe connector 13, and the gas pipe connector 1 3 is used to connect to the trachea, the first receiving groove 14 is used to accommodate the first plano-concave mirror 15, the first end cap 17 is used to abut and fix the first plano-concave mirror 15, the second receiving groove 18 is used to accommodate the second plano-concave mirror 19, the second end cap 114 is used to abut and fix the second plano-concave mirror 19, the first mounting hole 21 on the first mounting seat 2 is used to install the light-emitting diode 22 and the collimating lens 23, the second mounting hole 24 is used to install the first photosensitive detector 25 and the reference gas chamber 26; the second mounting seat 27 is used to install the spectrometer 28, the second photosensitive detector 29, the reflector 210 and the third photosensitive detector 211, and the second mounting seat 27 is connected to the first mounting seat 27 through the first mounting hole 21. A bracket 218 is used to install the spectrometer 28 and the third photosensitive detector 211. The second mounting seat 27 is used to install the reflector 210 through the second bracket 219. The third mounting seat 212 is used to install the window mirror 213 through the third bracket 220. The first positioning hole 214 cooperates with the first positioning block 215 to achieve positioning between the first mounting seat 2 and the second mounting seat 27. The second positioning hole 216 cooperates with the second positioning block 217 to achieve positioning between the third mounting seat 212 and the second mounting seat 27. The first mounting seat 2, the second mounting seat 27 and the third mounting seat 212 adopt a serial splicing design, which makes the installation of the lens group more convenient.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for detecting trace gases under strong spectral background interference, comprising a housing (1), characterized in that: A cavity (11) is provided in the housing (1), one end of the cavity (11) is fixedly connected to a first plano-concave mirror (15), a plane mirror (16) is fixedly connected to the first plano-concave mirror (15), the other end of the cavity (11) is fixedly connected to a second plano-concave mirror (19), a window mirror (213) is provided on one side of the second plano-concave mirror (19), a third photosensitive detector (211) is provided on one side of the window mirror (213), and a reflector (213) is provided on one side of the third photosensitive detector (211). 0), a spectroscope (28) is provided at the top of the reflector (210), a second photosensitive detector (29) is provided at the top of the spectroscope (28), a reference gas chamber (26) is provided on one side of the spectroscope (28), a first photosensitive detector (25) is provided on one side of the reference gas chamber (26), a collimating lens (23) is provided at the bottom end of the reference gas chamber (26), the collimating lens (23) is provided on one side of the spectroscope (28), and a light-emitting diode (22) is provided on one side of the collimating lens (23).

2. The device for detecting trace gases under strong spectral background interference according to claim 1, characterized in that: One side of the cavity (11) is conductively connected to a first accommodating groove (14), and a first plano-concave mirror (15) is fixedly connected in the first accommodating groove (14).

3. The device for detecting trace gases under strong spectral background interference according to claim 2, characterized in that: A first end cover (17) is provided on one side of the first plano-concave mirror (15), and the first end cover (17) is fixedly connected to the housing (1).

4. The device for detecting trace gases under strong spectral background interference according to claim 1, characterized in that: The other side of the cavity (11) is conductively connected to a second receiving groove (18), and a second plano-concave mirror (19) is fixedly connected to the second receiving groove (18). A second end cover (114) is provided on one side of the second plano-concave mirror (19), and the second end cover (114) is fixedly connected to the housing (1). A first mounting seat (2) is fixedly connected to the second end cover (114), and a first mounting hole (21) is provided on the first mounting seat (2), and a light-emitting diode (22) is fixedly connected to one end of the first mounting hole (21), and a collimating lens (23) is fixedly connected to the other end of the first mounting hole (21). The first mounting hole (2 1) A second mounting hole (24) is provided at the top, and a first photosensitive detector (25) is fixedly connected to one end of the second mounting hole (24), a reference gas chamber (26) is fixedly connected to the other end of the second mounting hole (24), a second mounting seat (27) is fixedly connected to the first mounting seat (2), and a spectroscope (28), a second photosensitive detector (29), a reflector (210) and a third photosensitive detector (211) are all fixedly connected to the second mounting seat (27), a third mounting seat (212) is fixedly connected to the second mounting seat (27), and a window mirror (213) is fixedly connected to the third mounting seat (212).

5. The device for detecting trace gases under strong spectral background interference according to claim 4, characterized in that: A first bracket (218) is fixedly connected to the first mounting seat (2), and the spectroscope (28) and the third photosensitive detector (211) are both fixedly connected to the first bracket (218); a second bracket (219) is fixedly connected to the first mounting seat (2), and the reflector (210) is fixedly connected to the second bracket (219); a third bracket (220) is fixedly connected to the third mounting seat (212), and the window mirror (213) is fixedly connected to the third bracket (220).

6. The device for detecting trace gases under strong spectral background interference according to claim 4, characterized in that: The second plano-concave mirror (19) is provided with a first exit hole (110), a first entrance hole (111) is provided at the bottom of the first exit hole (110), a second exit hole (112) is provided at the bottom of the first entrance hole (111), and a second entrance hole (113) is provided at the bottom of the second exit hole (112).

7. The device for detecting trace gases under strong spectral background interference according to claim 4, characterized in that: Two threaded holes (12) are provided in the cavity (11), and an air pipe joint (13) is threadedly connected to the threaded holes (12).

8. The device for detecting trace gases under strong spectral background interference according to claim 4, characterized in that: The first mounting seat (2) is provided with a first positioning hole (214), a first positioning block (215) is sleeved in the first positioning hole (214), and the first positioning block (215) is fixedly connected to the second mounting seat (27); the second mounting seat (27) is provided with a second positioning hole (216), a second positioning block (217) is sleeved in the second positioning hole (216), and the second positioning block (217) is fixedly connected to the third mounting seat (212).