CN212159553U - Infrared gas detector of thermopile - Google Patents
Infrared gas detector of thermopile Download PDFInfo
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- CN212159553U CN212159553U CN202020698689.0U CN202020698689U CN212159553U CN 212159553 U CN212159553 U CN 212159553U CN 202020698689 U CN202020698689 U CN 202020698689U CN 212159553 U CN212159553 U CN 212159553U
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- thermopile
- base
- window
- gas detector
- infrared gas
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Abstract
The utility model relates to a gaseous detection area especially relates to a thermopile infrared gas detector, the influence that light caused when can reducing thermopile detection gas concentration. The utility model provides a thermopile infrared gas detector, includes base and tube, the base is equipped with two thermopiles, the tube sets up on the base, and the tube is equipped with detection window and benchmark window, the position of detection window and benchmark window respectively with different the position looks adaptation of thermopile is equipped with the shading piece between two thermopiles. The shading block can play a role in blocking light, so that the light emitted from the detection window and the reference window is prevented from being influenced mutually, and the sensing error of the thermopile on the light is eliminated.
Description
Technical Field
The utility model relates to a gaseous detection area especially relates to a thermopile infrared gas detector.
Background
Devices for detecting gas concentration based on the non-dispersive infrared (NDIR) principle often employ thermopile infrared gas detectors.
In order to improve the detection accuracy, a dual-light-path detection method is commonly adopted at present, one is a reference light path, and the other is a detection light path. Different wavelengths are absorbed by different filters, thus requiring the thermopile infrared gas detector to receive both wavelengths simultaneously.
The existing thermopiles are packaged in the detector, and light rays can affect all the thermopiles no matter which light path channel is penetrated, so that the accuracy of detection results is affected.
SUMMERY OF THE UTILITY MODEL
The above is not enough to prior art, the utility model provides a thermopile infrared gas detector can reduce the influence that light caused when the thermopile detected gas concentration.
The utility model provides a scheme as follows:
the utility model provides a thermopile infrared gas detector, includes base and tube, the base is equipped with two thermopiles, the tube sets up on the base, and the tube is equipped with detection window and benchmark window, the position of detection window and benchmark window respectively with different the position looks adaptation of thermopile is equipped with the shading piece between two thermopiles. The shading block can play a role in blocking light, so that the light emitted from the detection window and the reference window is prevented from being influenced mutually, and the sensing error of the thermopile on the light is eliminated.
Preferably, the detection window and the reference window are provided with optical filters with different light transmittances. The optical filters with different light transmittances can selectively enable light rays with different wavelengths to pass through, the light passing through the detection window is the light which is absorbed most obviously by the gas to be detected, and the light passing through the reference window is the light which is almost not absorbed by the gas to be detected.
Preferably, the width of the light shielding block is larger than that of the thermopile. The larger the width of the shading block is, the better the light isolation effect is.
Preferably, the light shielding block is a ceramic light shielding block. The ceramic shading block has good heat insulation effect, and can also play a role in heat insulation besides isolating light.
Preferably, the detection window and the reference window are separated by a light shielding strip, and the light shielding strip is located above the light shielding block. The distance between the detection window and the reference window is pulled open by the shading strip, and when light passes through, the light can be better isolated by the shading block.
Preferably, the base is provided with a temperature detection device. The detection of the thermopile is affected by temperature, so a temperature detection device is arranged, temperature compensation is performed when the gas concentration is calculated according to the detected temperature change in the detector, and the calculation accuracy of the result is improved.
Preferably, the temperature detection device is a thermistor. The thermistor has a simple structure, and the temperature change condition can be obtained only by measuring the resistance value change of the thermistor.
Preferably, the thermopile and the temperature detection device are both connected with a lead, the other end of the lead extends to the outer sides of the base and the tube shell, and the tube shell and the base are encapsulated by glue pouring. The packaging mode realizes the isolation between the tube shell and the inside and the outside of the base, and reduces the influence of the external environment on the detector.
The utility model discloses following beneficial effect has:
1. the shading block can play a role in isolating light rays between the two thermopiles, so that the influence of light rays emitted from different windows on the thermopiles is reduced, and the detection accuracy is improved;
2. the temperature detection device can provide temperature compensation for the temperature in the detector in the calculation process of the gas concentration, reduce the influence of the temperature on the thermopile and improve the detection accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a base structure;
fig. 3 is a schematic view of the combination state of the present invention.
In the figure: 1-base, 2-tube shell, 3-thermopile, 4-detection window, 5-reference window, 6-shading block, 7-shading strip, 8-temperature detection device, 9-lead and 10-contact pin.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
As shown in fig. 1 to fig. 3, the present embodiment provides a thermopile infrared gas detector, which includes a base 1 and a tube 2, wherein the base 1 is provided with two thermopiles 3, the tube 2 is disposed on the base 1, the tube 2 is provided with a detection window 4 and a reference window 5, the positions of the detection window 4 and the reference window 5 are respectively adapted to the positions of different thermopiles 3, and a light shielding block 6 is disposed between the two thermopiles 3.
The width of the light shielding block 6 is larger than that of the thermopile 3. The shading block 6 is a ceramic shading block.
The detection window 4 and the reference window 5 are provided with optical filters having different light transmittances. The detection window 4 and the reference window 5 are separated by a light shielding bar 7, and the light shielding bar 7 is positioned above the light shielding block 6.
The base 2 is provided with a temperature detection device 8, and the temperature detection device 8 is a thermistor. The thermopile 3 and the temperature detection device 8 are both connected with a lead 9, and the lead 9 adopts a gold thread. The other end of the lead 9 extends to the base 1 and the outer side of the tube shell 2, and the tube shell 2 and the base 1 are encapsulated by glue. The bottom of the base 1 is provided with a pin 10, and the thermopile 3 is also connected with the base 1 through a lead 9.
Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A thermopile infrared gas detector, characterized in that: the device comprises a base and a tube shell, wherein the base is provided with two thermopiles, the tube shell is arranged on the base, the tube shell is provided with a detection window and a reference window, the positions of the detection window and the reference window are respectively matched with the positions of the different thermopiles, and a shading block is arranged between the two thermopiles.
2. A thermopile infrared gas detector of claim 1, wherein: and the detection window and the reference window are provided with optical filters with different light transmittance.
3. A thermopile infrared gas detector of claim 1, wherein: the width of the shading block is larger than that of the thermopile.
4. A thermopile infrared gas detector of claim 1, wherein: the shading block is a ceramic shading block.
5. A thermopile infrared gas detector of claim 3, wherein: the detection window and the reference window are separated by a shading strip, and the shading strip is positioned above the shading block.
6. A thermopile infrared gas detector of claim 1, wherein: the base is provided with a temperature detection device.
7. The thermopile infrared gas detector of claim 6, wherein: the temperature detection device is a thermistor.
8. A thermopile infrared gas detector according to any one of claims 1-7, wherein: the thermopile is connected with a lead, the other end of the lead extends to the outer sides of the base and the tube shell, and the tube shell and the base are encapsulated by glue pouring.
9. A thermopile infrared gas detector according to claim 6 or 7, characterized in that: the temperature detection device is connected with a lead, the other end of the lead extends to the outer sides of the base and the tube shell, and the lead and the base are encapsulated by glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020698689.0U CN212159553U (en) | 2020-04-29 | 2020-04-29 | Infrared gas detector of thermopile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020698689.0U CN212159553U (en) | 2020-04-29 | 2020-04-29 | Infrared gas detector of thermopile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212159553U true CN212159553U (en) | 2020-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020698689.0U Active CN212159553U (en) | 2020-04-29 | 2020-04-29 | Infrared gas detector of thermopile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212159553U (en) |
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2020
- 2020-04-29 CN CN202020698689.0U patent/CN212159553U/en active Active
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