CN212622219U - Nitrogen oxide detection device - Google Patents
Nitrogen oxide detection device Download PDFInfo
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- CN212622219U CN212622219U CN202021219794.8U CN202021219794U CN212622219U CN 212622219 U CN212622219 U CN 212622219U CN 202021219794 U CN202021219794 U CN 202021219794U CN 212622219 U CN212622219 U CN 212622219U
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- Prior art keywords
- optical fiber
- nitrogen oxide
- detection chamber
- incident
- reflection
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 18
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 239000000835 fiber Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- ZCUQOPGIJRGJDA-UHFFFAOYSA-N 1-naphthalen-1-ylethane-1,2-diamine Chemical compound C1=CC=C2C(C(N)CN)=CC=CC2=C1 ZCUQOPGIJRGJDA-UHFFFAOYSA-N 0.000 description 1
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 206010014561 Emphysema Diseases 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- -1 Nitrogen oxygenCompound Chemical class 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 206010006451 bronchitis Diseases 0.000 description 1
- 238000003869 coulometry Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000005437 stratosphere Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
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- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
A nitrogen oxide detection device comprises a broadband light source, a detector and a data processor. The detector is provided with a detection chamber and a gas passage penetrating through the detection chamber, a plane nitrogen oxide sensitive reflecting coating is arranged at the bottom of the detection chamber, a broadband light source is connected to an incident optical fiber converter through an incident optical fiber, the incident optical fiber converter is connected to one side of the top of the detection chamber through an incident optical fiber probe, a data processor is connected to the reflecting optical fiber converter through a reflecting optical fiber, the reflecting optical fiber converter is connected to the other side of the top of the detection chamber through a reflecting optical fiber probe, incident light sequentially passes through the incident optical fiber converter and the incident optical fiber probe and then reaches the nitrogen oxide sensitive reflecting coating, reflected light after reflection sequentially passes through the reflecting optical fiber probe and the reflecting optical fiber converter and enters the data processor, and. The detection device minimizes environmental interference, and is convenient to detect and low in cost.
Description
Technical Field
The utility model relates to a nitrogen oxide detection device.
Background
Air is the root for human survival, so environmental air quality monitoring is very essential. Nitrogen oxygenCompound (NO)x) Mainly comprising Nitric Oxide (NO) and nitrogen dioxide (NO)2) They form pollutants when present in the atmosphere in amounts and for periods of time to the extent that they have a deleterious effect on humans, animals, plants and other materials. Nitrogen oxide pollution is associated with the use of fossil fuels as an energy source. The increasing use of automobiles and the high concentration in large cities make nitrogen oxides one of the major atmospheric pollutants in all cities in the world. Nitrogen oxides enter deep parts of human lungs through respiration, and can cause diseases such as bronchitis or emphysema. The nitrogen oxide can also react with other pollutants in the atmosphere photochemically to form photochemical smog pollution. N is a radical of2The oxidation of O to nitric acid in the atmosphere is one of the causes of acid rain. N is a radical of2O also reduces ozone in the stratosphere, thereby increasing the amount of uv radiation reaching the earth.
At present, methods for detecting nitrogen oxides in the atmosphere comprise a naphthyl ethylenediamine hydrochloride spectrophotometry method, a galvanic coulometry method, a gas chromatography and the like, and although the detection methods have advantages and disadvantages and applicable fields, detection equipment is complex in structure and is not easy to realize detection automation, online monitoring and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a receive that environmental disturbance is little, easily realize detecting automatic nitrogen oxide detection device.
According to the utility model, a nitrogen oxide detection device is provided, which comprises a broadband light source, a detector and a data processor, wherein the detector is provided with a detection chamber and a gas passage passing through the detection chamber, the bottom of the detection chamber is provided with a plane nitrogen oxide sensitive reflection coating, the broadband light source is connected with an incident optical fiber converter through an incident optical fiber, the incident optical fiber converter is connected with one side of the top of the detection chamber through an incident optical fiber probe, the data processor is connected with a reflection optical fiber converter through a reflection optical fiber, the reflection optical fiber converter is connected with the other side of the top of the detection chamber through a reflection optical fiber probe, the incident light from the broadband light source reaches the nitrogen oxide sensitive reflection coating arranged at the bottom of the detection chamber after passing through the incident optical fiber converter and the incident optical fiber probe in sequence, the reflected light reflected by, the data processor receives and processes the reflected light (signal) and then outputs a corresponding nitric oxide concentration signal.
According to a preferred embodiment of the nitrogen oxide detecting apparatus of the present invention, the gas passage passing through the detection chamber has a gas inlet located below one side of the detector and a gas outlet located above the other side of the detector. This configuration minimizes the environmental interference experienced by the detection while also allowing the nitroxide-containing gas to contact the nitroxide-sensitive coating with sufficient delay to increase detection sensitivity.
According to the utility model discloses a nitrogen oxide detection device's another preferred scheme, the sensitive reflective coating of nitrogen oxide that incident optical fiber probe set up incident light directive detection cavity bottom with 45 incident angles, and the sensitive reflective coating of nitrogen oxide reflects corresponding reverberation to reflection optical fiber probe with 45 reflection angles. This structure maximizes the light utilization efficiency, thereby improving the detection accuracy.
According to a further preferred version of the nitrogen oxide detection apparatus of the present invention, the broadband light source and/or the data processor is further provided with an adjustable grating. The adjustable grating can filter out unwanted light components, and further improves the detection precision.
The utility model discloses a nitrogen oxide detection device receives noise and other external environmental factor interference influences for a short time, detects convenient and with low costs.
Drawings
Fig. 1 is a schematic structural diagram of a nitrogen oxide detection device according to the present invention.
Detailed Description
The nitrogen oxide detecting device of the present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
Fig. 1 schematically shows a nitrogen oxide detection apparatus of the present invention, which generally comprises a broadband light source 1, a detector 5 and a data processor 8.
The broadband light source 1 comprises a laser 1a and an adjustable grating 1 b. The adjustable grating 1b is used to filter out unwanted light components generated by the laser 1a so that it contains only light components that are advantageous for detection, such as blue light.
The data processor 8 comprises an optical signal processing unit 8a and an adjustable grating 8 b. The adjustable grating 8b is also used to filter out unwanted or interfering light components so that the optical signal processing unit 8a receives only the useful optical signal.
The detector 5 has a central detection chamber (a rectangular chamber is shown) and a tortuous gas path through the detection chamber. The gas passage has a gas inlet 5b located below one side (right side in the drawing) of the detector 5 and a gas outlet 5c located above the other side (left side in the drawing) of the detector 5. The bottom of the detection chamber is provided with a planar nitric oxide sensitive reflective coating 5 a. The composition and preparation of the oxynitride-sensitive reflective coating 5a are conventional in the art, and therefore, it is not described in detail how the oxynitride-containing gas changes the reflected light intensity or signal.
As shown, a broadband light source 1 is connected to an incident fiber converter 3 through an incident fiber 2 a. The incident fiber converter 3 is connected to the top side (right side in the figure) of the detection chamber by an incident fiber probe 6. The data processor 8 is connected to the reflective fiber converter 4 through the reflective fiber 2 b. The reflective fiber optic transducer 4 is connected to the other side of the top of the detection chamber (left side of the figure) by a reflective fiber optic probe 7. The incident optical fiber probe 3 and the reflection optical fiber probe 7 are arranged to form an included angle of approximately 90 degrees, namely, the incident optical fiber probe 3 emits the incident light to the nitrogen oxide sensitive reflection coating 5a arranged at the bottom of the detection chamber at an incident angle of 45 degrees, and the nitrogen oxide sensitive reflection coating 5a reflects the corresponding reflected light to the reflection optical fiber probe 7 at a reflection angle of 45 degrees.
The working principle of the detection device of the present invention is briefly described below.
During operation, the gas to be detected containing nitrogen oxide enters the detection chamber from the gas inlet 5b, passes through the nitrogen oxide sensitive reflecting coating 5a and then flows out from the gas outlet 5 c. Meanwhile, the incident light from the broadband light source 1 sequentially passes through the incident optical fiber 2a, the incident optical fiber converter 3 and the incident optical fiber probe 6 and then reaches the nitrogen oxide sensitive reflecting coating 5a arranged at the bottom of the detection chamber, and the reflected light reflected by the nitrogen oxide sensitive reflecting coating 5a sequentially passes through the reflecting optical fiber probe 7, the reflecting optical fiber converter 4 and the reflecting optical fiber 2b and then enters the data processor 8. The data processor 8 receives and processes the reflected light, and then compares the reflected light with a blank or reference light signal to output a corresponding nitrogen oxide concentration signal.
Claims (4)
1. A nitrogen oxide detection device is characterized by comprising a broadband light source, a detector and a data processor, wherein the detector is provided with a detection chamber and a gas passage penetrating through the detection chamber, the bottom of the detection chamber is provided with a planar nitrogen oxide sensitive reflection coating, the broadband light source is connected with an incident optical fiber converter through an incident optical fiber, the incident optical fiber converter is connected with one side of the top of the detection chamber through an incident optical fiber probe, the data processor is connected with a reflection optical fiber converter through a reflection optical fiber, the reflection optical fiber converter is connected with the other side of the top of the detection chamber through a reflection optical fiber probe, incident light from the broadband light source sequentially passes through the incident optical fiber converter and the incident optical fiber probe and then reaches the nitrogen oxide sensitive reflection coating arranged at the bottom of the detection chamber, and reflected light reflected by the nitrogen oxide sensitive reflection, the data processor receives and processes the reflected light and then outputs a corresponding NOx concentration signal.
2. The nitrogen oxide detection device of claim 1, wherein the gas passage through the detection chamber has a gas inlet located below one side of the detector and a gas outlet located above the other side of the detector.
3. The apparatus of claim 2, wherein the incidence fiber optic probe directs the incident light at a 45 ° angle of incidence to a reflective coating disposed on the bottom of the detection chamber, the reflective coating reflecting the reflected light at a 45 ° angle of reflection to the reflective fiber optic probe.
4. A nitrogen oxide detection apparatus as claimed in claim 3, wherein the broadband light source and/or the data processor is further provided with an adjustable grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021219794.8U CN212622219U (en) | 2020-06-29 | 2020-06-29 | Nitrogen oxide detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021219794.8U CN212622219U (en) | 2020-06-29 | 2020-06-29 | Nitrogen oxide detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212622219U true CN212622219U (en) | 2021-02-26 |
Family
ID=74744100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021219794.8U Expired - Fee Related CN212622219U (en) | 2020-06-29 | 2020-06-29 | Nitrogen oxide detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212622219U (en) |
-
2020
- 2020-06-29 CN CN202021219794.8U patent/CN212622219U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210226 |