CN215493152U - Low-concentration gas detection device - Google Patents
Low-concentration gas detection device Download PDFInfo
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- CN215493152U CN215493152U CN202122077659.5U CN202122077659U CN215493152U CN 215493152 U CN215493152 U CN 215493152U CN 202122077659 U CN202122077659 U CN 202122077659U CN 215493152 U CN215493152 U CN 215493152U
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Abstract
A low-concentration gas detection device comprises an infrared light source, a filter wheel, a cavity pool, a detector, a motor and a control circuit board; the cavity pool comprises a main body, a main lens group, an auxiliary lens group, a first steering lens group, a second steering lens group, a receiving seat and a multi-channel input group; the infrared light source, the filter wheel and the motor are fixed inside the multi-channel input group, and the detector is fixed on the receiving seat and positioned in the cavity of the main body; the second steering mirror group is fixed in front of the infrared light source and used for reflecting infrared light emitted by the infrared light source to the auxiliary mirror group, and the first steering mirror group is fixed below the detector and used for reflecting the infrared light reflected by the auxiliary mirror group to the detector; the motor drives the filter wheel to rotate so as to periodically shield the infrared light source, and the infrared light is irradiated on the detector after being reflected for multiple times by the cavity pool, so that the detector generates a voltage signal. The application provides a low concentration gas detection device, solves the problem that current sensor does not possess the gaseous ability of detection low concentration.
Description
Technical Field
The utility model relates to the field of gas detection, in particular to a low-concentration gas detection device.
Background
The existing infrared sensor generally adopts an electrical modulation method, when the electrical modulation is adopted, the higher electrical modulation frequency is beneficial to improving the signal-to-noise ratio, so that the resolution ratio of the sensor is higher, the sensor can measure gas with lower concentration, but when the electrical modulation frequency is higher, the signal obtained by a detector is reduced, and the improvement of the resolution ratio is not facilitated. Therefore, the existing electrical modulation method is suitable for detecting the concentration of the gas in the medium-high concentration range, but in the aspect of detecting the gas in the low concentration range, due to the limitation of the principle and the large influence of the temperature, the detection error and other indexes can not meet the requirements of customers.
In view of this, it is necessary to adjust the conventional sensor so as to meet the requirement of being able to detect the low concentration range gas.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that current sensor does not possess the gaseous ability of detection low concentration, the application provides a low concentration gas detection device.
In order to achieve the technical effects, the specific technical scheme of the utility model is as follows:
a low concentration gas detection apparatus comprising: the device comprises an infrared light source, a filter wheel, a cavity pool, a detector, a motor and a control circuit board;
the cavity pool comprises a main body, a main lens group, an auxiliary lens group, a first steering lens group, a second steering lens group, a receiving seat, an input sealing group and a multi-channel input group;
the main body is of a cavity structure, and the primary lens group and the secondary lens group are oppositely fixed on two short side edges of the main body to form a closed air chamber structure with the main body;
the multi-channel input group is arranged on one long side of the main body through the input sealing group, the receiving seat is arranged on the top surface of the main body, the infrared light source, the filter wheel and the motor are fixed in the multi-channel input group, and the detector is fixed on the receiving seat and positioned in the cavity of the main body;
the second steering mirror group is fixed in front of the infrared light source and used for reflecting infrared light emitted by the infrared light source onto the auxiliary mirror group, the first steering mirror group is fixed below the detector and used for reflecting the infrared light reflected by the auxiliary mirror group to the detector, and the detector is a single-channel detector with a refrigeration function;
the motor drives the filter wheel to rotate according to the driving signal of the control circuit board, the infrared light source is periodically shielded, and the infrared light is irradiated on the detector after being reflected for multiple times by the cavity pool, so that the detector generates a voltage signal.
Specifically, infrared light emitted by the infrared light source is reflected to the secondary mirror group through the second steering mirror group, the infrared light is reflected for multiple times between the secondary mirror group and the primary mirror group, finally, the infrared light is reflected to the first steering mirror group through the secondary mirror group, and then the infrared light is reflected to the detector through the first steering mirror group.
Preferably, the control circuit board comprises a motor control module, a signal amplification module, a signal processing module and a detector constant temperature control module, wherein the detector constant temperature control module is used for controlling the temperature of the detector within a preset range.
Preferably, the optical lens system further comprises a heater for heating the primary lens group and the secondary lens group to prevent the lenses from dewing and affecting the optical path.
Preferably, the primary mirror group comprises a primary mirror fixing plate and a primary mirror, and a positioning groove is formed in the primary mirror fixing plate and used for fixing the primary mirror for reflecting infrared light; the auxiliary mirror group comprises an auxiliary mirror fixing plate and an auxiliary mirror, and a positioning groove is also formed in the auxiliary mirror fixing plate and used for fixing the auxiliary mirror for reflecting infrared light.
Preferably, the primary mirror is fixed on the primary mirror fixing plate in parallel, and the secondary mirror is also fixed on the secondary mirror fixing plate in parallel, and the primary mirror is composed of two lenses arranged at a certain interval.
Preferably, the first steering mirror group comprises a first steering mirror base and a first steering mirror, the first steering mirror is vertically fixed on the first steering mirror base through a slot extending from the first steering mirror base, the second steering mirror group comprises a second steering mirror base and a second steering mirror, and the second steering mirror is vertically fixed on the second steering mirror base through a slot extending from the second steering mirror base.
Preferably, the filter wheel is composed of round aluminum sheets with symmetrical sides, and the reference gas and the gas to be detected with high concentration are respectively sealed in two parts separated from the filter wheel.
Preferably, the main body is further provided with an air inlet nozzle and an air outlet nozzle which are used for being connected with an air pipe to carry out calibration experiments on the device.
Preferably, the first steering mirror group and the second steering mirror group are detachably connected with the main body.
Preferably, the main lens group, the auxiliary lens group, the receiving seat and the multi-channel input group are detachably connected with the main body.
According to the technical scheme, compared with the prior art, the infrared light is reflected for multiple times to obtain a longer optical path, so that the absorption capacity of gas is increased, the signal variation of the detector is increased, and the technical effect of increasing the resolution of the sensor is achieved; in addition, the method of mechanical chopping is adopted, the frequency of infrared light modulation is high, and the influence of noise on signals is reduced.
Drawings
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is another side view of the present invention;
FIG. 4 is a schematic view of an internal structure of the present invention;
FIG. 5 is an exploded view of the present invention;
wherein, 1, a main body; 2. a primary lens group; 21. a primary mirror fixing plate; 22. a primary mirror; 3. a secondary lens group; 31. a secondary mirror fixing plate; 32. a secondary mirror; 4. a first steering lens group; 41. a first steering lens base; 42. a first steering mirror; 5. a second steering lens group; 51. a second steering mirror base; 52. a second steering mirror; 6. a receiving seat; 7. inputting a sealing group; 8. a multi-channel input group; 9. a heater; 10. an air inlet nozzle; 11. an air outlet nozzle; 12. an infrared light source; 13. a filter wheel; 14. an electric motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present embodiments more clear, the technical solutions in the present embodiments will be described clearly and completely below with reference to the accompanying drawings in the present embodiments, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present application.
In the description of the present invention, it is to be understood that the terms "upper end", "lower end", "trailing end", "left and right", "up and down", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
Referring to fig. 1 to 5, an embodiment of the present application provides a low concentration gas detecting apparatus including: the device comprises an infrared light source, a filter wheel, a cavity pool, a detector, a motor and a control circuit board; wherein the cavity pool comprises: the multi-channel multi-lens system comprises a main body 1, a main lens group 2, an auxiliary lens group 3, a first steering lens group 4, a second steering lens group 5, a receiving seat 6, an input sealing group 7 and a multi-channel input group 8.
A main mirror 22 is installed on the main mirror fixing plate 21, an auxiliary mirror 32 composed of two lenses is installed on the auxiliary mirror fixing plate 31, the distance between the two lenses is determined through adjustment and is used for forming a white cavity structure, the fact that infrared light can be reflected for multiple times in a certain optical path is guaranteed, and the optical path of the device is increased. And, all be fixed with heater 9 in primary mirror fixed plate, the secondary mirror fixed plate for heat primary mirror group 2 and secondary mirror group 3, prevent that the lens dewfall of its constitution from influencing the light path.
The length of the second steering mirror group is slightly longer than the whole length of the first steering mirror group, so that the second steering mirror group can correspond to the opening in the main body, the first steering mirror group and the second steering mirror group are used for adjusting the direction between the first steering mirror group and the second steering mirror group, and infrared light can enter and exit from the main body while reflection is carried out as many times as possible.
Specifically, infrared light emitted by the infrared light source 12 is reflected to the secondary mirror group 3 through the second turning mirror group 5, the infrared light is reflected for multiple times between the secondary mirror group 3 and the primary mirror group 2, finally, the infrared light is reflected to the first turning mirror group 4 through the secondary mirror group 3, and the infrared light is reflected to the detector through the first turning mirror group 4. Particularly, the detector is a single-channel detector with a refrigeration function, when the temperature is low, the grid voltage of a field effect tube in the detector is smaller than the starting voltage, the refrigeration function is not started, when the temperature is high, the grid voltage of the field effect tube is larger than the starting voltage, the field effect tube is conducted, the refrigeration function in the detector is started, and the detector is refrigerated.
The filter wheel 13 is made of a circular aluminum sheet whose inner portion is divided into two sides which are symmetrical, and is used for sealing corresponding gas, one symmetrical end is used for sealing reference gas (generally nitrogen gas, which does not react with other gas), and the other end is used for sealing high-concentration gas to be measured (assuming that the gas to be measured is CH)4Then 90% or more of CH can be sealed4Gas), one end for sealing the reference gas is used for detecting the change of the reference end, and one end for sealing the high-concentration gas to be detected is used for detecting the change of the signal end. The motor 14 drives the filter wheel 13 to rotate according to the driving signal of the control circuit board, the infrared light source is periodically shielded, and the infrared light is irradiated on the detector after being reflected for multiple times by the cavity pool, so that the detector generates a voltage signal.
Four threaded holes are evenly distributed in the receiving seat 6 and used for being fixed with the main body and preventing stress from causing loosening and sliding, the circular sizes of the upper surface and the lower surface are different according to the sizes of an actual detector and an optical filter, the lower part of the receiving seat is used for fixing the optical filter, the upper part of the receiving seat is used for fixing the detector, a sealing ring is used between the detector and the receiving seat 6 for sealing, and the sealing ring is made of silica gel/butyronitrile materials and is convenient to seal and connect the detector and a control circuit board.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the utility model and are not intended to be limiting. For a person skilled in the art to which the utility model pertains, several simple deductions, modifications or substitutions may be made according to the idea of the utility model.
Claims (10)
1. A low concentration gas detection apparatus, comprising: the device comprises an infrared light source, a filter wheel, a cavity pool, a detector, a motor and a control circuit board;
the cavity pool comprises a main body (1), a main mirror group (2), an auxiliary mirror group (3), a first steering mirror group (4), a second steering mirror group (5), a receiving seat (6), an input sealing group (7) and a multi-channel input group (8);
the main body is of a cavity structure, and the main lens group (2) and the auxiliary lens group (3) are oppositely fixed on two short side edges of the main body to form a closed air chamber structure with the main body;
the multi-channel input group (8) is arranged on one long side of the main body through an input sealing group, the receiving seat (6) is arranged on the top surface of the main body, the infrared light source (12), the filter wheel (13) and the motor (14) are fixed in the multi-channel input group (8), and the detector is fixed on the receiving seat (6) and is positioned in the cavity of the main body;
the second steering mirror group (5) is fixed in front of the infrared light source and used for reflecting infrared light emitted by the infrared light source to the auxiliary mirror group (3), the first steering mirror group (4) is fixed below the detector and used for reflecting the infrared light reflected by the auxiliary mirror group (3) to the detector, and the detector is a single-channel detector with a refrigeration function;
the motor drives the filter wheel to rotate according to the driving signal of the control circuit board, the infrared light source is periodically shielded, and the infrared light is irradiated on the detector after being reflected for multiple times by the cavity pool, so that the detector generates a voltage signal.
2. The low concentration gas detection device according to claim 1, wherein the control circuit board comprises a motor control module, a signal amplification module, a signal processing module, and a detector constant temperature control module, and the detector constant temperature control module is configured to control the temperature of the detector within a preset range.
3. A low concentration gas detecting apparatus according to claim 1, further comprising a heater (9) for heating said primary lens group (2) and said secondary lens group (3) to prevent dew condensation on the lenses from affecting the optical path.
4. The low concentration gas detection device according to claim 1, wherein the primary lens group (2) comprises a primary lens fixing plate (21) and a primary lens (22), the primary lens fixing plate (21) is provided with a positioning groove for fixing the primary lens (22) for reflecting infrared light; the auxiliary mirror group (3) comprises an auxiliary mirror fixing plate (31) and an auxiliary mirror (32), and a positioning groove is also formed in the auxiliary mirror fixing plate (31) and used for fixing the auxiliary mirror (32) for reflecting infrared light.
5. The low concentration gas detecting apparatus according to claim 4, wherein the primary mirror (22) is fixed in parallel to the primary mirror fixing plate (21), and the secondary mirror (32) is also fixed in parallel to the secondary mirror fixing plate and is composed of two mirror plates disposed at a certain interval.
6. A low concentration gas detecting device as claimed in claim 1, wherein said first steering mirror group (4) comprises a first steering mirror base (41) and a first steering mirror (42), said first steering mirror (42) is vertically fixed on said first steering mirror base (41) through a slot extending from said first steering mirror base (41), said second steering mirror group (5) comprises a second steering mirror base (51) and a second steering mirror (52), said second steering mirror (52) is vertically fixed on said second steering mirror base (51) through a slot extending from said second steering mirror base (51).
7. The apparatus for detecting a low concentration of gas as claimed in claim 1, wherein said filter wheel is made of a round aluminum plate having two symmetrical sides, and the reference gas and the gas to be detected having a high concentration are respectively sealed in two portions partitioned from the filter wheel.
8. The low-concentration gas detection device as claimed in claim 1, wherein the main body is further provided with an air inlet nozzle (10) and an air outlet nozzle (11) for connecting with an air pipe to perform a calibration experiment on the device.
9. The apparatus for detecting a low concentration of gas as claimed in any one of claims 1 to 8, wherein said first and second steering lens groups (4, 5) are detachably connected to said main body.
10. A low concentration gas detection apparatus as claimed in any one of claims 1 to 8, wherein said primary lens group (2), secondary lens group (3), receptacle (6), multi-channel input group (8) and said main body are detachably connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122077659.5U CN215493152U (en) | 2021-08-31 | 2021-08-31 | Low-concentration gas detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122077659.5U CN215493152U (en) | 2021-08-31 | 2021-08-31 | Low-concentration gas detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215493152U true CN215493152U (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122077659.5U Active CN215493152U (en) | 2021-08-31 | 2021-08-31 | Low-concentration gas detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215493152U (en) |
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2021
- 2021-08-31 CN CN202122077659.5U patent/CN215493152U/en active Active
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| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: Room 1714, Area A, 5th Floor, Building 1, No. 668, Shangda Road, Baoshan District, Shanghai, 200444 Patentee after: SHANGHAI SHENWEI ELECTRONIC TECHNOLOGY CO.,LTD. Address before: No.48 Jinqiu Road, Baoshan District, Shanghai, 200443 Patentee before: SHANGHAI SHENWEI ELECTRONIC TECHNOLOGY CO.,LTD. |
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