CN216284917U - NDIR sensor for monitoring carbon emission - Google Patents
NDIR sensor for monitoring carbon emission Download PDFInfo
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- CN216284917U CN216284917U CN202122355400.2U CN202122355400U CN216284917U CN 216284917 U CN216284917 U CN 216284917U CN 202122355400 U CN202122355400 U CN 202122355400U CN 216284917 U CN216284917 U CN 216284917U
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000003287 optical effect Effects 0.000 abstract description 20
- 238000004140 cleaning Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 106
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
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- 239000002245 particle Substances 0.000 description 2
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- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The utility model discloses an NDIR sensor for monitoring carbon emission in the technical field of sensors, which comprises a sensor body, wherein an annular gas channel is arranged in the sensor body, a gas inlet and a gas outlet are arranged on one side of the sensor body, the gas inlet is respectively communicated with a gas inlet channel to be detected and a clearance gas inlet channel, and an electronic valve is arranged at the joint of the gas inlet channel to be detected and the clearance gas inlet channel. The utility model can fully increase the effective optical path for reacting with the gas without increasing the volume of the optical cavity, increases the accuracy of gas detection, controls the entrance of pure air through the electronic valve, avoids the influence of detection between the front gas and the rear gas, and realizes the self-cleaning function of the sensor.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to an NDIR sensor for monitoring carbon emission.
Background
Infrared absorption gas sensors are widely used in the fields of indoor and outdoor gas quality detection, VOCS detection, toxic and harmful gas detection, and the like. The detection principle of the infrared absorption gas sensor is as follows: the gas (CH 4, CO2 and the like) with the asymmetric diatomic or polyatomic structure has characteristic absorption spectrum in the middle infrared, and the gas concentration of the corresponding gas can be determined by utilizing the relation (Lambert-beer law) between the gas concentration and the absorption intensity. In the carbon neutralization field, the NDIR sensor has the advantages of good repeatability, high precision, non-contact detection realization, long service life and the like for monitoring greenhouse gases such as CH4, CO2 and the like, and has wide application prospect.
In the detection process, the longer the optical path of the infrared gas sensor is, the more sufficient the gas absorption of the infrared gas sensor is, and the more accurate the detection result is. However, most of the current optical cavities adopt straight cavities, and in order to obtain larger optical path, the sensor volume is larger. In order to solve the problem of large chamber size, the optical cavity of the existing partial sensor adopts various reflective optical path designs, and the optical path is increased by the reflective optical path design to achieve miniaturization of the optical cavity, however, the space of the vent hole for gas diffusion is necessarily small, and the response time of the sensor is affected.
In the prior art, a pump suction type sensor is used for increasing the gas response speed, however, gas or particles which are easy to adsorb and precipitate may exist in the gas to be detected, and the adsorption of the gas particles in the optical cavity can cause the optical cavity to be polluted, so that the accuracy of subsequent gas detection is influenced. In addition, for a gas sensor for multi-path gas detection, the previously detected gas is difficult to remove, and the subsequent gas detection is also influenced.
The above-mentioned drawbacks, worth improving.
Disclosure of Invention
To overcome the deficiencies of the prior art, the present invention provides an NDIR sensor for carbon emission monitoring.
The technical scheme of the utility model is as follows:
an NDIR sensor for monitoring carbon emission comprises a sensor body, wherein an annular gas channel is arranged inside the sensor body, a gas inlet and a gas outlet are arranged on one side of the sensor body,
the gas inlet is respectively communicated with a gas inlet channel to be detected and a clearance gas inlet channel, and the gas inlet channel to be detected and the clearance gas inlet channel are provided with electronic valves.
The utility model according to the above aspect is characterized in that the gas channel includes a straight channel and an arc channel, one side end of the straight channel is provided with a light source, the other side end of the straight channel is communicated with the arc channel, and the center of the arc channel is provided with a detector.
Further, the gas inlet and the gas outlet are both positioned on one side of the straight channel.
Furthermore, the detector is positioned in the detection chamber, and an arc reflector is arranged between the detection chamber and the tail end of the arc channel.
Further, one side end of the straight channel is provided with a first reflector, and the other side end thereof is provided with a second reflector, so that:
the light emitted by the light source is reflected by the first reflector and then enters the second reflector, and the light reflected by the second reflector enters the arc-shaped channel;
or, the light emitted by the light source is emitted into the straight channel through the first reflector, is reflected for multiple times in the straight channel and then enters the second reflector, and the light reflected by the second reflector enters the arc-shaped channel.
Further, the light source is located at a corner of one side end portion of the straight passage, and the second reflector is located at a corner of the other side end portion of the straight passage opposite to the light source.
Furthermore, the inner wall and the outer wall of the arc-shaped channel are reflecting surfaces, and light rays entering the arc-shaped channel sequentially pass through the inner wall and the outer wall and then reach the detector after multiple reflections.
Furthermore, a third reflector is arranged on one side/top of the detector, and light rays in the arc-shaped channel reach the detector after being reflected by the third reflector.
Furthermore, the section of the arc-shaped channel is in a semicircular ring shape.
The utility model according to the above scheme is characterized in that the sensor body comprises a sensor housing, the gas channel is located inside the sensor housing, and a thermometer is arranged on the sensor housing.
The utility model according to the scheme has the advantages that:
according to the utility model, through the mutual matching of the straight channel and the arc-shaped channel, light rays emitted by the light source are reflected for multiple times in the arc-shaped channel, the optical path from the light source to the detector of the whole light rays is increased, the reaction time of the light rays and gas is further increased, and the gas detection accuracy is ensured; meanwhile, the volume of the optical cavity can be fully saved, and the application of a miniaturized sensor is facilitated.
The utility model can also control the gas entering the optical cavity through the electronic valve, and the gas to be detected is flushed with pure air after the detection of the gas to be detected is finished so as to remove the redundant gas to be detected, thereby avoiding the influence of the gas to be detected on the detection accuracy of the gas to be detected, avoiding the pollution in the optical cavity of the sensor and realizing the self-cleaning function.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an optical circuit diagram of the present invention.
In the figures, the various reference numbers:
11-gas inlet channel to be measured; 12-gas outlet channel; 13-clean air inlet channel; 14-an electronic valve;
21-a light source; 22-a first mirror; 23-a second mirror; 24-a curved mirror; 25-a third mirror; 26-a detector;
30-thermometer.
Detailed Description
The utility model is further described with reference to the following figures and embodiments:
as shown in fig. 1, an NDIR sensor for monitoring carbon emission includes a sensor body, an annular gas channel is provided inside the sensor body, a gas inlet and a gas outlet are provided on one side of the sensor body, gas enters the sensor body through the gas inlet, and gas is discharged through the gas outlet after bypassing the annular gas channel.
The gas inlet is respectively communicated with the gas inlet channel to be tested 11 and the clearance gas inlet channel 13, and the gas inlet channel to be tested 11 and the clearance gas inlet channel 13 are provided with electronic valves 14; the gas outlet is connected to a gas outlet channel 12.
In one embodiment, the gas inlet channel 11 to be tested is communicated with the gas environment to be tested and is provided with a corresponding gas pump, and the gas to be tested in the gas environment to be tested is pumped into the gas inlet channel 11 to be tested through the gas pump and the electronic valve 14; the clean air inlet channel 13 is communicated with the inert gas chamber and is provided with a corresponding gas pump, and the inert gas in the inert gas chamber is pumped into the clean air inlet channel 13 through the gas pump and the electronic valve 14. In another embodiment, in order to save cost and reduce operation difficulty, the gas outlet is connected with the gas pump, and the gas inlet channel 11 to be detected can be opened by opening the electronic valve 14 of the gas inlet channel 11 to be detected, so as to realize detection of the gas to be detected; the air-free inlet channel 13 can be opened by opening the electronic valve 14 of the air-free inlet channel 13, so that the 'cleaning' of the sensor body is realized.
According to the two embodiments, the time for gas to enter the sensor body can be greatly shortened through the pumping operation, and the response time of the whole gas detection is shortened.
The gas entering the sensor body can be controlled by controlling the opening and closing of the electronic valve 14, and when the electronic valve 14 controls the opening of the gas inlet channel 11 to be detected and the closing of the clearance gas inlet channel 13, the gas to be detected enters the sensor body and is detected by a detection system in the sensor body; when the electronic valve 14 controls the gas channel 11 to be detected to be closed and the clearance gas inlet channel 13 to be opened, the clearance gas (inert gas) enters the sensor body, the original gas to be detected in the sensor body is expelled, and the detection accuracy of the subsequent gas to be detected, which is influenced by the gas to be detected before, is avoided.
Preferably, the electronic valve 14 can be set to open and close correspondingly, for example, every day, every week, every half month, etc., to switch to the open state of the empty gas inlet channel 13, so as to clean the sensor body and the gas inlet, thereby realizing the self-cleaning function of the sensor. Due to the design of the self-cleaning function, the detection result distortion caused by the pollution of the optical cavity is avoided, the long-term detection precision of the sensor is improved, and the service life of the sensor is prolonged.
The sensor body comprises a sensor shell, and the gas channel is positioned inside the sensor shell. Preferably, a thermometer 30 is disposed on the sensor housing, and the ambient temperature of the gas detected by the sensor is compensated by the thermometer 30, so as to improve the accuracy of the gas detection.
In the utility model, the annular gas channel comprises a straight channel and an arc-shaped channel communicated with the straight channel, a light source 21 is arranged at one side end part of the straight channel, the other side end part of the straight channel is communicated with the arc-shaped channel, a detector 26 is arranged at the center of the arc-shaped channel, light rays emitted by the light source 21 enter the detector 26 after sequentially passing through the straight channel and the arc-shaped channel, and in the transmission process of the light rays, the light rays are repeatedly refracted in the arc-shaped channel to increase the optical path, so that the accuracy of gas detection is improved.
Specifically, the light source 21 is located at a corner of one side end portion of the straight channel, and the side end portion of the straight channel is provided with a first reflector 22, and the other side end portion of the straight channel is provided with a second reflector 23. In one embodiment, the light emitted from the light source 21 is reflected by the first reflector 22 and then enters the second reflector 23, and the light reflected by the second reflector 23 enters the arc-shaped channel; in another embodiment, the light emitted from the light source 21 is incident into the straight channel through the first reflecting mirror 22, and enters the second reflecting mirror 23 after being reflected a plurality of times in the straight channel, and the light reflected by the second reflecting mirror 23 enters the arc channel.
In order to realize normal propagation of light, the first reflector 22 is located on the top surface of one side end of the straight channel so that upward light emitted from the light source 21 can be incident from the first reflector 22 into the second reflector 23. Preferably, the second reflector 23 is located at the other side end of the straight passage and at a corner opposite to the light source 21, so that the light reflected by the first reflector 21 can enter the arc-shaped passage via reflection by the second reflector 23.
The inner wall and the outer wall of the arc-shaped channel are both reflecting surfaces, and light rays entering the arc-shaped channel reach the detector 26 after being reflected for multiple times by the inner wall and the outer wall in sequence. Preferably, the inner wall of the arc-shaped channel is formed by coating a film after the metal plate is bent (the reflection effect is easy to control), and the outer wall of the arc-shaped channel is formed by the inner surface of the sensor shell, so that the processing difficulty of the arc-shaped channel can be fully reduced, and the volume of the whole sensor body is reduced.
The detector 26 in the utility model is a thermopile or pyroelectric detector, which is a dual-channel detector comprising a detection channel and a reference channel, and the accurate result of the gas to be detected is obtained by performing differential operation on the detection results of the detection channel and the reference channel. The detector 26 is located in a detection chamber, the detection chamber is provided with a gas inlet and outlet, and the detection chamber is respectively communicated with the arc-shaped channel and the straight channel through the gas inlet and outlet. The gas entering from the gas inlet can enter the detection chamber through the gas inlet and outlet after passing through the straight channel and the arc channel, and the gas in the detection chamber can be discharged from the gas inlet and outlet, the straight channel and the gas outlet.
An arc reflector 24 is arranged between the detection chamber and the tail end of the arc channel, the arc reflector 24 is positioned at the inner side corner position of the head end of the straight channel, meanwhile, the light source 21 is positioned on the back surface of the arc reflector 24, light rays in the arc channel can be focused to the detector 26 through the arc reflector 24, and the influence on the detection effect caused by the reduction of the light rays entering the detector 26 is avoided. Preferably, the section of the arc-shaped channel is semicircular, one end of the semicircle is communicated with the tail end of the straight channel, and the other end of the semicircle is communicated with the detection chamber through the cambered reflector 24.
A third reflector 25 is arranged at one side/top of the detector 26, and the light in the arc-shaped channel reaches the detector 26 after being reflected by the third reflector 25. Since the detector 26 is located on the bottom surface of the sensor body, in order to enable the light to smoothly enter the detector, the third reflector 25 in the present invention is located on the top surface of the sensor body, so that the light reflected by the curved reflector 24 can enter the detector 26 via the reflection of the third reflector 25.
In the present invention, the gas inlet and gas outlet are located on one side of the straight channel, which allows the gas to rapidly fill the entire optical cavity (i.e., the annular gas channel).
As shown in fig. 2, the process of detecting the gas is as follows (the dotted line in the figure represents light): gaseous via the gaseous inlet passage that awaits measuring, inside gaseous entry gets into the sensor body, first speculum 22 is penetrated to the light that light source 21 sent, first speculum 22 is reflected the second mirror 23 with light, the outer wall of arc passageway is reflected with light to the second mirror 23, light after the outer wall reflection carries out the multiple reflection and arrives cambered surface speculum 24 between the inner wall of arc passageway and outer wall in proper order, cambered surface speculum 24 gets into the third speculum 25 in the detection chamber with light reflection, light through the reflection of third speculum 25 gets into in the detector 26.
The detector 26 detects the concentration of the gas to be measured entering the sensor body based on the intensity of the received infrared light. The thermometer on the sensor shell provides a temperature compensation function in the process, the influence of the change of the ambient temperature on the detection result of the sensor is avoided, and a more accurate detection effect is realized.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.
The utility model is described above with reference to the accompanying drawings, which are illustrative, and it is obvious that the implementation of the utility model is not limited in the above manner, and it is within the scope of the utility model to adopt various modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other fields without modification.
Claims (10)
1. An NDIR sensor for monitoring carbon emission comprises a sensor body, wherein an annular gas channel is arranged inside the sensor body, a gas inlet and a gas outlet are arranged on one side of the sensor body,
the gas inlet is respectively communicated with a gas inlet channel to be detected and a clearance gas inlet channel, and the gas inlet channel to be detected and the clearance gas inlet channel are provided with electronic valves.
2. The NDIR sensor for carbon emission monitoring according to claim 1, wherein the gas channel comprises a straight channel and an arc-shaped channel, one side end of the straight channel is provided with a light source, the other side end thereof is communicated with the arc-shaped channel, and the center of the arc-shaped channel is provided with a detector.
3. The NDIR sensor for carbon emission monitoring according to claim 2, wherein the gas inlet and the gas outlet are both located at one side of the straight channel.
4. The NDIR sensor for carbon emission monitoring according to claim 2, wherein the detector is located within a detection chamber, and a curved mirror is provided between the detection chamber and the end of the curved channel.
5. The NDIR sensor for carbon emission monitoring according to claim 2, wherein one side end of the straight channel is provided with a first mirror and the other side end thereof is provided with a second mirror, such that:
the light emitted by the light source is reflected by the first reflector and then enters the second reflector, and the light reflected by the second reflector enters the arc-shaped channel;
or, the light emitted by the light source is emitted into the straight channel through the first reflector, is reflected for multiple times in the straight channel and then enters the second reflector, and the light reflected by the second reflector enters the arc-shaped channel.
6. The NDIR sensor for carbon emission monitoring according to claim 5, wherein the light source is located at a corner of one side end of the straight channel, and the second mirror is located at a corner of the other side end of the straight channel opposite to the light source.
7. The NDIR sensor for carbon emission monitoring of claim 2, wherein the inner and outer walls of the arc-shaped channel are reflective surfaces, and light entering the arc-shaped channel reaches the detector after multiple reflections from the inner and outer walls.
8. The NDIR sensor for carbon emission monitoring according to claim 2, wherein a third mirror is provided at one side/top of the detector, and the light in the arc-shaped channel reaches the detector after being reflected by the third mirror.
9. The NDIR sensor for carbon emission monitoring according to claim 2, wherein the arc-shaped channel is semi-circular in cross-section.
10. The NDIR sensor for carbon emissions monitoring of claim 1, wherein the sensor body comprises a sensor housing, the gas channel is located inside the sensor housing, and a thermometer is provided on the sensor housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355400.2U CN216284917U (en) | 2021-09-27 | 2021-09-27 | NDIR sensor for monitoring carbon emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355400.2U CN216284917U (en) | 2021-09-27 | 2021-09-27 | NDIR sensor for monitoring carbon emission |
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| Publication Number | Publication Date |
|---|---|
| CN216284917U true CN216284917U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122355400.2U Active CN216284917U (en) | 2021-09-27 | 2021-09-27 | NDIR sensor for monitoring carbon emission |
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| CN (1) | CN216284917U (en) |
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- 2021-09-27 CN CN202122355400.2U patent/CN216284917U/en active Active
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Address after: Room 1701, Building C1, No. 459 Qiaokai Road, Fenghuang Community, Guangming District, Shenzhen City, Guangdong Province, 518000 Patentee after: Shenzhen Lianding Sensing Technology Co.,Ltd. Address before: 518000 5b, building B6, Guangming Science Park, China Merchants Bureau, sightseeing Road, Fenghuang community, Fenghuang street, Guangming District, Shenzhen, Guangdong Province Patentee before: Shenzhen noan Sensing Technology Co.,Ltd. |