CN219842329U - Explosion-proof type non-dispersive infrared gas detection device - Google Patents
Explosion-proof type non-dispersive infrared gas detection device Download PDFInfo
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- CN219842329U CN219842329U CN202321362066.6U CN202321362066U CN219842329U CN 219842329 U CN219842329 U CN 219842329U CN 202321362066 U CN202321362066 U CN 202321362066U CN 219842329 U CN219842329 U CN 219842329U
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- gas detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000005457 Black-body radiation Effects 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 239000000835 fiber Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses an explosion-proof non-dispersive infrared gas detection device, which comprises a gas chamber in direct contact with a sample to be detected and a host connected with the gas chamber, wherein the gas chamber is arranged in a testing device and is connected with the host through a plurality of infrared optical fibers so as to isolate the gas chamber from the host. The utility model adopts the infrared optical fiber to physically isolate the air chamber and the host of the NDIR sensor, thereby realizing the safety detection of organic steam in high-temperature and high-concentration environments; the N-in-one optical fiber bundle structure is adopted, and the simultaneous detection of the multi-component gas is realized by matching with a detector-optical filter array or a multi-pixel detector in the detector module; the design of the reflective air chamber can adjust the detection capacities of sensitivity, measuring range, precision and the like according to application requirements.
Description
Technical Field
The utility model relates to the technical field of atmosphere analysis, in particular to an explosion-proof non-dispersive infrared gas detection device.
Background
The non-dispersive infrared (NDIR) gas detection technology is a common gas detection technology and has the advantages of real-time detection, wide detection range, low maintenance cost, long service life and the like. NDIR gas sensors meeting explosion-proof requirements are also proposed in recent years, and related structures are described in "non-dispersive infrared gas detection element structural design" in the literature "engineering technical study"; the explosion-proof function of the air chamber is realized by isolating a circuit part and an air chamber part of the NDIR sensor mainly through encapsulation of integral epoxy resin.
As the existing explosion-proof NDIR sensor is mainly used for CO 2 、CO、N 2 Inorganic gases such as O or CH 4 The detection of the organic gas does not involve the problem that the gas to be detected corrodes the epoxy resin for encapsulation, so that the relevant NDIR sensor can be designed in a compact integrated manner. However, in the case of an ultrahigh-concentration high-temperature organic vapor environment, there is a possibility that the epoxy resin for potting may swell, bubble, or crack after long-term use, and the explosion-proof design of the NDIR sensor may be broken, which may pose a certain safety risk.
Disclosure of Invention
The utility model provides an explosion-proof non-dispersive infrared gas detection device, which is used for solving the technical problem that an explosion-proof NDIR sensor in the prior art has safety risks in long-term use in a high-temperature and high-concentration organic steam environment by realizing an integrated structural design through integrally encapsulating epoxy resin.
The utility model solves the problems by the following technical proposal:
the explosion-proof non-dispersive infrared gas detector includes one air chamber in direct contact with the sample to be detected and one main machine connected to the air chamber, and the air chamber is set inside the test unit and connected to the main machine via several infrared fibers to isolate the air chamber from the main machine.
As a further improvement of the utility model, the testing device is an explosion-proof box.
As a further improvement of the utility model, the gas detection device also comprises a computer, and the computer is connected with the host computer through a data line.
As a further development of the utility model, the host comprises at least a light source module and a detector module,
the light source module is used for providing an infrared light source for non-dispersive infrared detection;
the detector module is used to detect the reference returned from the gas cell and to detect the infrared signal.
As a further improvement of the present utility model, the light source module is a blackbody radiation source or a halogen lamp.
As a further development of the utility model, the detector module is a detector-filter array or a multi-pixel detector.
As a further improvement of the utility model, the infrared optical fiber is of an N-in-one optical fiber bundle structure.
As a further improvement of the utility model, the infrared optical fiber at least comprises an optical fiber incident end, an optical fiber signal end and an optical fiber air chamber interface end; the optical fiber incident end is connected with the light source module, the optical fiber signal end is connected with the detector module, and the optical fiber air chamber interface end is connected with the air chamber by adopting a low-loss connector.
As a further improvement of the present utility model, the infrared optical fiber adopts a multimode optical fiber.
As a further improvement of the utility model, the air chamber adopts a reflective structure and comprises a cylindrical shell, a mounting plate, an auto-focusing collimating lens group and a reflecting mirror, wherein the mounting plate, the auto-focusing collimating lens group and the reflecting mirror are arranged at one end of the cylindrical shell, a plurality of air holes are formed in the cylindrical shell, the auto-focusing collimating lens group is arranged in one end of the cylindrical shell, which is close to the mounting plate, the reflecting mirror is arranged in one end of the cylindrical shell, which is far away from the mounting plate, and the cylindrical shell is connected with a low insertion loss joint through the mounting plate.
Compared with the prior art, the utility model has the following advantages:
(1) The air chamber and the electrical part of the NDIR sensor are physically isolated by adopting the infrared optical fiber, so that the safety detection of organic steam in a high-temperature and high-concentration environment is realized;
(2) The N-in-one optical fiber bundle structure is adopted to be matched with a detector-optical filter array or a multi-pixel detector in the detector module, so that the simultaneous detection of the multi-component gas is realized;
(3) And the design of the reflective air chamber can adjust the detection capacities of sensitivity, measuring range, precision and the like according to application requirements.
Drawings
FIG. 1 is a schematic diagram of an explosion-proof non-dispersive infrared gas detection device according to the present utility model.
FIG. 2 is a schematic diagram of a reflective air chamber according to the present utility model.
FIG. 3 is a schematic diagram of a detector-filter array according to the present utility model.
Fig. 4 is a schematic structural diagram of a multi-pixel detector according to the present utility model.
Reference numerals:
1. a gas chamber; 2. a host; 3. an infrared optical fiber; 4. a computer; 5. a data line; 6. a testing device; 11. a cylindrical housing; 12. a mounting plate; 13. ventilation holes; 14. a low insertion loss joint; 15. an auto-focusing collimating lens group; 16. a reflecting mirror; 21. a light source module; 22. a detector module; 31. an optical fiber incident end; 32. an optical fiber signal end; 33. an interface end of the optical fiber air chamber; 22a. Detector-filter array; 22a-1. A detector; 22a-2. A second filter; 22b, a multi-pixel detector; 22b-1. A first filter.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
The explosion-proof non-dispersive infrared gas detector includes one air chamber in direct contact with the sample to be detected and one main machine connected to the air chamber, and the air chamber is set inside the test unit and connected to the main machine via several infrared fibers to isolate the air chamber from the main machine.
Specifically, referring to fig. 1, the gas detection device is composed of a gas chamber 1, a host 2, an infrared optical fiber 3, a computer 4, a data line 5, and the like. The host machine 2 is arranged in the external area of the testing device 6, and further, the testing device can directly adopt an explosion-proof box according to specific requirements; the air chamber 1 is arranged in the inner area of the testing device 6 and is in direct contact with the sample to be tested; the host machine 2 and the air chamber 1 are connected through a plurality of infrared optical fibers 3, the infrared optical fibers 3 only input and output intrinsically safe low-power infrared light, and no other energy input source exists between the air chamber 1 and the host machine 2, so that the design of the gas detection device accords with the design of intrinsic safety.
Further, the host 2 is mainly composed of a light source module 21 and a detector module 22.
The light source module 21 is used to provide an infrared light source for non-dispersive infrared detection, and preferably, a blackbody radiation source or a halogen lamp type infrared light source can be selected according to the detection requirements.
The detector module 22 is configured to detect the reference signal and the infrared signal returned from the gas chamber 1, and is preferably implemented by a detector-filter array or a multi-pixel detector, and referring to fig. 3, the detector-filter array 22a is composed of a plurality of detectors 22a-1 and a plurality of corresponding second filters 22 a-2; referring to fig. 4, a plurality of first optical filters 22b-1 are disposed in the multi-pixel detector 22b, and detection of different components and simultaneous detection of one or more gas components can be achieved by changing the use of different second optical filters 22a-2 or first optical filters 22b-1.
The signal modulation and data processing of the host 2 are completed by the computer 4, the related data transmission is completed by the data line 5, and USB or network line transmission can be selected according to specific requirements.
Further, the infrared optical fiber 3 is an N-in-one optical fiber bundle structure, and at least includes an optical fiber incident end 31, an optical fiber signal end 32, and an optical fiber air chamber interface end 33. The optical fiber incident end 31 is connected with the light source module 21, the optical fiber signal end 32 is connected with the detector module 22, and the optical fiber air chamber interface end 33 is connected with the air chamber 1 by adopting low-loss connectors.
Preferably, the infrared optical fiber 3 adopts a multimode optical fiber, wherein the optical fiber incident end 31 is a single-mode large-core-diameter optical fiber, and the core diameter is 200 um; the fiber signal end 32 is a multimode fiber, and is arranged in a central symmetry manner at the fiber air chamber interface end 33, so that the fiber signal end is usually even, such as a 6-core 50um fiber bundle. The multimode fiber used in the fiber optic signal end 32 may be packaged in a single fiber, and may be used in conjunction with a detector-filter array or a multi-pixel detector in the detector module 22 to achieve simultaneous detection of multiple component gases.
The air chamber 1 is installed in the testing device 6, is contacted with the high-temperature steam to be detected for a long time, and is prepared by adopting a material with stable mechanical structure and chemical inertia, preferably: 316L stainless steel, aluminum alloy, etc. Meanwhile, in order to reduce the infrared light loss of the inner wall of the air chamber, the inner part of the air chamber 1 needs to be polished into a mirror surface. Further, dielectric film materials with high infrared reflectivity can be plated in the air chamber, preferably: gold.
In order to facilitate installation and use and ensure sufficient detection sensitivity and progress, the air chamber 1 adopts a reflective structure.
Referring to fig. 2, the gas cell 1 is composed of a cylindrical housing 11, a mounting plate 12, a vent hole 13, a low insertion loss joint 14, an auto-focus collimator lens group 15, a reflecting mirror 16, and the like. The mounting panel 12 sets up in cylinder shell 11 one end, is formed with a plurality of bleeder vent 13 on the cylinder shell 11, is provided with the auto-focus collimating lens group 15 in the cylinder shell 11 one end that is close to mounting panel 12, is provided with speculum 16 in the cylinder shell 11 one end that is away from the mounting panel, and cylinder shell 11 is connected with low insertion loss through mounting panel 12 and connects 14. The infrared light emitted from the light source module 21 enters the air chamber 1 through the low insertion loss connector 14 after being transmitted by the infrared optical fiber 3, is collimated by the auto-focusing collimating lens group 15 and propagates in the cylindrical shell 11, and then returns to the auto-focusing collimating lens group 15 through the reflecting mirror 16 to be focused and then is collected to the infrared optical fiber 3. Infrared light is absorbed by the gas to be measured in the cylindrical housing 11, so that the optical path can be effectively changed by adjusting the length of the cylindrical housing 11, thereby adjusting the performances of sensitivity, precision, measuring range and the like of the technology.
The utility model adopts the infrared optical fiber to physically isolate the air chamber and the electrical part of the NDIR sensor, thereby realizing the safety detection of organic steam in high-temperature and high-concentration environments; the N-in-one optical fiber bundle structure is adopted, and the simultaneous detection of the multi-component gas is realized by matching with a detector-optical filter array or a multi-pixel detector in the detector module; the design of the reflective air chamber can adjust the detection capacities of sensitivity, measuring range, precision and the like according to application requirements.
Although the utility model has been described herein with reference to the above-described illustrative embodiments thereof, the foregoing embodiments are merely preferred embodiments of the present utility model, and it should be understood that the embodiments of the present utility model are not limited to the above-described embodiments, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.
Claims (10)
1. The explosion-proof non-dispersive infrared gas detection device is characterized by comprising a gas chamber in direct contact with a sample to be detected and a host connected with the gas chamber, wherein the gas chamber is arranged in a testing device and is connected with the host through a plurality of infrared optical fibers so as to isolate the gas chamber from the host.
2. The explosion-proof non-dispersive infrared gas detection device according to claim 1, wherein the testing device is an explosion-proof box.
3. The explosion-proof type non-dispersive infrared gas detection device according to claim 1, wherein the gas detection device further comprises a computer, and the computer is connected with the host through a data line.
4. An explosion-proof non-dispersive infrared gas detection device according to any one of claims 1 to 3, wherein the host comprises at least a light source module and a detector module,
the light source module is used for providing an infrared light source for non-dispersive infrared detection;
the detector module is used to detect the reference returned from the gas cell and to detect the infrared signal.
5. The explosion-proof non-dispersive infrared gas detection device according to claim 4, wherein the light source module is a blackbody radiation source or a halogen lamp.
6. The explosion-proof non-dispersive infrared gas detection device according to claim 4, wherein the detector module is a detector-filter array or a multi-pixel detector.
7. The explosion-proof non-dispersive infrared gas detection device according to claim 4, wherein the infrared optical fiber is of an N-in-one optical fiber bundle structure.
8. The explosion-proof type non-dispersive infrared gas detection device according to claim 7, wherein the infrared optical fiber at least comprises an optical fiber incident end, an optical fiber signal end and an optical fiber air chamber interface end; the optical fiber incident end is connected with the light source module, the optical fiber signal end is connected with the detector module, and the optical fiber air chamber interface end is connected with the air chamber by adopting a low-loss connector.
9. The explosion-proof type non-dispersive infrared gas detection device according to claim 7, wherein the infrared optical fiber adopts a multimode optical fiber.
10. The explosion-proof type non-dispersive infrared gas detection device according to claim 1, wherein the gas chamber adopts a reflective structure, and comprises a cylindrical shell, a mounting plate arranged at one end of the cylindrical shell, an auto-focusing collimating lens group and a reflecting mirror, wherein a plurality of air holes are formed in the cylindrical shell, the auto-focusing collimating lens group is arranged in one end of the cylindrical shell close to the mounting plate, the reflecting mirror is arranged in one end of the cylindrical shell far away from the mounting plate, and the cylindrical shell is connected with a low insertion loss joint through the mounting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321362066.6U CN219842329U (en) | 2023-05-31 | 2023-05-31 | Explosion-proof type non-dispersive infrared gas detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321362066.6U CN219842329U (en) | 2023-05-31 | 2023-05-31 | Explosion-proof type non-dispersive infrared gas detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219842329U true CN219842329U (en) | 2023-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321362066.6U Active CN219842329U (en) | 2023-05-31 | 2023-05-31 | Explosion-proof type non-dispersive infrared gas detection device |
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| Country | Link |
|---|---|
| CN (1) | CN219842329U (en) |
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2023
- 2023-05-31 CN CN202321362066.6U patent/CN219842329U/en active Active
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