CN204101438U - A kind of device that simultaneously can detect multiple nitrous oxides concentration - Google Patents
A kind of device that simultaneously can detect multiple nitrous oxides concentration Download PDFInfo
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- CN204101438U CN204101438U CN201420397804.5U CN201420397804U CN204101438U CN 204101438 U CN204101438 U CN 204101438U CN 201420397804 U CN201420397804 U CN 201420397804U CN 204101438 U CN204101438 U CN 204101438U
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- nitrous oxides
- oxides concentration
- detect multiple
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Abstract
The utility model discloses a kind of device that simultaneously can detect multiple nitrous oxides concentration, comprise diode laser light source, isolator, fiber optic splitter, wavemeter, optical coupling lens group, optical resonator, the data analysis unit that is made up of collector lens, detector, oscillograph, it is characterized in that described a kind of device that simultaneously can detect multiple nitrous oxides concentration be also provided with one by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit.This device has that device simple and stable, cost are low, highly sensitive, response fast and be easy to the advantage that operates, and can realize detecting NO on same device simultaneously
2, PAN, RONO
2etc. multiple oxides of nitrogen.
Description
Technical field
The utility model relates to dusty gas monitoring field, specifically a kind of device that simultaneously can detect multiple nitrous oxides concentration.
Background technology
Nitrogen oxides pollution thing refers to nitrogen monoxide and nitrogen dioxide; be mainly derived from the discharge of vehicle exhaust; the burning of rock gas, coal and fossil fuel; can and the organism in air react and generate other oxynitrides and comprise PAN (PAN), Alkyl nitrate (RONO
2), nitrous acid (HONO), nitric acid (HNO
3) etc., be referred to as NO
x.Oxides of nitrogen in air can cause acid rain, photo-chemical smog, ozone layer depletion, brings harm to human being's production and life.Realize detecting nitrous oxides concentration fast and accurately to effectively controlling and improving air quality important in inhibiting.
Cavity ring-down spectroscopy detection technique (CRDS) is a kind of high sensitivity absorption spectrum detection technique based on material absorbing spectrum.Laser is injected the optics cavity be made up of a pair ultra-high reflectivity eyeglass by this technology, and light is limited in roundtrip in cavity, after every secondary reflection light because of absorbed and from mirror portion through and weaken, in cavity, light intensity decays to single exponent ring-down.There is absorbing medium by measuring and there is not the absorbing medium time at the ring-down time swung in chamber that declines, in conjunction with spectral selectivity, in the spectral absorption cross section of tested molecule also by under the condition of Accurate Measurement, the suitable scope absorbing optical wavelength of selection then can realize the quantitative detection to different material.Cavity ring-down spectroscopy detection technique have highly sensitive, signal to noise ratio (S/N ratio) is high, antijamming capability is strong, detect the advantages such as quick, become and analyzed various trace or the strong instrument of trace materials.
At present, about the detector of oxides of nitrogen is varied, the response speed of each detector and sensitivity are also improving constantly, but mainly for detection of nitrogen monoxide and nitrogen dioxide, to other NO
ythe measuring study of molecule is also few, and is only limitted to the laboratory exploratory stage.Such as: the commercial NO originating from Thermo Environmental Instrument company
x-analyser applied chemistry luminescence method, can export NO, NO simultaneously
2and NO
xconcentration (actual measurement to be NO
xtotal amount), but cannot distinguish different molecules, and can NO be subject to
3, N
2o
5, the interference of the material such as PAN, fail to realize detecting on a certain equipment the content of oxynitrides in multiple air simultaneously.Therefore a kind of energy fast high-sensitive is needed to detect the instrument and equipment of oxynitride concentration in air in real time.
Utility model content
The utility model needs the problem solved to be propose a kind of device that simultaneously can detect multiple nitrous oxides concentration.This device has that device simple and stable, cost are low, highly sensitive, response fast and be easy to the advantage that operates, and can realize detecting NO on same device simultaneously
2, PAN, RONO
2etc. multiple oxides of nitrogen.
For solving the problem, the utility model adopts following technical scheme:
A kind of device that simultaneously can detect multiple nitrous oxides concentration, comprise diode laser light source, isolator, fiber optic splitter, wavemeter, optical coupling lens group, optical resonator, the data analysis unit that is made up of collector lens, detector, oscillograph, it is characterized in that described a kind of device that simultaneously can detect multiple nitrous oxides concentration be also provided with one by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit.
Described by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit comprise two adsorption filtration pipes, cyclone filter, well heater and millipore filters.
Described two adsorption filtration Guan Yizhi load silica gel (Silica), and load carbon dust (Carbon) for other one, sample introduction gas first passes through silica gel again by carbon dust.
Described well heater is the quartz glass tube of diameter 5mm, length 25cm.
Described aerosol fillter is a particulate filter, and built-in micropore Teflon film, before being placed in CRDS optical cavity.
The process that utilization the utility model pick-up unit carries out the Concentration Testing of multiple oxides of nitrogen is as follows:
Gas to be measured, by adsorption filter, removes NO wherein
ycompound, " totally " air obtained as background, for measuring without light intensity decays speed (1/ τ under acceptance condition
0), shift out adsorption filter during actual measurement ambient concentration, directly measure; Then by entering well heater after the dust in cyclone filter elimination gas, as only measured NO
2, NO or N
2o, need not add hot-air, as measured PAN or RONO
2, then pyrolysis temperature and pyrolysis time is controlled, by compound PAN or RONO by computer program
2quantitative pyrolysis is NO
2, then through the Air flow of 100cm; Then the aerosol particle removed in air by millipore filter laggard enter in optical resonator.Beam of laser is launched by above-mentioned diode light-source, laser is divided into strong and weak two bundles by fiber optic splitter after optoisolator, wherein strong beam through the first coupled lens and the second coupled lens coupling laggard enter optical resonator, the data receipt unit be made up of detector, optical fiber, oscillograph after collector lens optically focused through the laser in chamber carries out spectra collection, wherein low light level bundle is admitted to wavemeter and reads wavelength, wavemeter is all connected with computing machine with oscillograph, finally carries out data analysis by computing machine.
Accompanying drawing explanation
Fig. 1 is a kind of device schematic diagram that simultaneously can detect multiple nitrous oxides concentration of the utility model.
Fig. 2 be the utility model by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Figure 1 shows that a kind of device schematic diagram that simultaneously can detect multiple nitrous oxides concentration, comprise diode laser light source 1, optoisolator 2, fiber optic splitter 3, first optical coupling lens 4, second optical coupling lens 5, optical resonator 6, collector lens 7, detector 8, oscillograph 9, wavemeter 10, computing machine and 11, by quantitatively converting for itrogenous organic substance for NO
2pyrolysis unit 12.
Fig. 2 be the utility model by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit schematic diagram, comprise two adsorption filtration pipes 13, cyclone filter 14, well heater 15, millipore filter 16.
A kind of device that simultaneously can detect multiple nitrous oxides concentration comprises the following steps:
The first step: gas to be measured successively by filling two adsorption filtration pipes 13 of carbon dust and silica gel, removes NO wherein
ycompound, " totally " air obtained, as background, shifts out adsorption filter during actual measurement ambient concentration, directly measures; Then by entering well heater 15 after cyclone filter 14, as only measured NO
2, NO or N
2o, need not add hot-air, as measured PAN or RONO
2, then pyrolysis temperature and pyrolysis time is controlled, by compound PAN or RONO by computer program
2quantitative pyrolysis is NO
2, then through the Air flow of 100cm; Then by millipore filter 16.
Second step: by millipore filter gas brought into optical resonator cavity 6 out.
3rd step: launch beam of laser by diode laser light source 1, through optoisolator 2, be divided into two bundles by fiber optic splitter 3, wherein low light level bundle is admitted in wavemeter 10, strong beam through the first optical coupling lens 4 and the second optical coupling lens 5 laggard enter optical resonator 6.
4th step: the laser through chamber focuses on the detector 8 through collector lens 7, the data receipt unit be made up of detector 8 and oscillograph 9 carries out spectra collection.
5th step: the spectroscopic data collected directly is sent into and carries out data analysis by computing machine 10.
Claims (5)
1. one kind can be detected the device of multiple nitrous oxides concentration simultaneously, comprise diode laser light source, isolator, fiber optic splitter, wavemeter, optical coupling lens group, optical resonator, the data analysis unit that is made up of collector lens, detector, oscillograph, it is characterized in that described a kind of device that simultaneously can detect multiple nitrous oxides concentration be also provided with one by quantitatively converting for itrogenous organic substance be NO
2pyrolysis unit.
2. a kind of device that simultaneously can detect multiple nitrous oxides concentration according to claim 1, it is characterized in that described by quantitatively converting for itrogenous organic substance for NO
2pyrolysis unit comprise two adsorption filtration pipes, cyclone filter, well heater and millipore filters.
3. a kind of device that simultaneously can detect multiple nitrous oxides concentration according to claim 1, is characterized in that described two adsorption filtration Guan Yizhi load silica gel, and load carbon dust for other one, sample introduction gas first passes through silica gel again by carbon dust.
4. a kind of device that simultaneously can detect multiple nitrous oxides concentration according to claim 1, is characterized in that described well heater is the quartz glass tube of diameter 5mm, length 25cm.
5. a kind of device that simultaneously can detect multiple nitrous oxides concentration according to claim 1, it is characterized in that described aerosol fillter is a particulate filter, built-in micropore Teflon film, before being placed in CRDS optical cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420397804.5U CN204101438U (en) | 2014-07-12 | 2014-07-12 | A kind of device that simultaneously can detect multiple nitrous oxides concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420397804.5U CN204101438U (en) | 2014-07-12 | 2014-07-12 | A kind of device that simultaneously can detect multiple nitrous oxides concentration |
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| Publication Number | Publication Date |
|---|---|
| CN204101438U true CN204101438U (en) | 2015-01-14 |
Family
ID=52269857
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|---|---|---|---|
| CN201420397804.5U Expired - Fee Related CN204101438U (en) | 2014-07-12 | 2014-07-12 | A kind of device that simultaneously can detect multiple nitrous oxides concentration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424631A (en) * | 2015-12-25 | 2016-03-23 | 中国科学院合肥物质科学研究院 | Ultrahigh sensitivity nitrogen oxide measurement system based on ultraviolet-visible waveband absorption spectrum |
| CN106198486A (en) * | 2016-06-29 | 2016-12-07 | 安徽精准产品质量检测有限公司 | Alkali liquor absorption Raman spectroscopy measures the method for amount of nitrogen oxides in air |
| CN106248639A (en) * | 2016-06-20 | 2016-12-21 | 环境保护部华南环境科学研究所 | Multichannel nitrogen oxides on-line monitoring system based on laser-induced fluorescence (LIF) |
| CN106596437A (en) * | 2016-12-30 | 2017-04-26 | 北京大学 | On-line measuring system and on-line measuring method for concentration of NO3 free radicals in atmosphere |
| CN108489971A (en) * | 2018-05-17 | 2018-09-04 | 安徽科技学院 | A kind of rapid detection method of nitrogen oxides |
| CN110007026A (en) * | 2019-04-19 | 2019-07-12 | 中国科学院生态环境研究中心 | Trace nitrogen oxides detection method and device in a kind of atmosphere |
-
2014
- 2014-07-12 CN CN201420397804.5U patent/CN204101438U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424631A (en) * | 2015-12-25 | 2016-03-23 | 中国科学院合肥物质科学研究院 | Ultrahigh sensitivity nitrogen oxide measurement system based on ultraviolet-visible waveband absorption spectrum |
| CN105424631B (en) * | 2015-12-25 | 2018-12-07 | 中国科学院合肥物质科学研究院 | A kind of hypersensitivity nitrogen oxides measuring system based on UV, visible light wave band absorption spectrum |
| CN106248639A (en) * | 2016-06-20 | 2016-12-21 | 环境保护部华南环境科学研究所 | Multichannel nitrogen oxides on-line monitoring system based on laser-induced fluorescence (LIF) |
| CN106198486A (en) * | 2016-06-29 | 2016-12-07 | 安徽精准产品质量检测有限公司 | Alkali liquor absorption Raman spectroscopy measures the method for amount of nitrogen oxides in air |
| CN106198486B (en) * | 2016-06-29 | 2019-01-01 | 安徽精准产品质量检测有限公司 | The method of amount of nitrogen oxides in lye absorption-Raman spectroscopy measurement air |
| CN106596437A (en) * | 2016-12-30 | 2017-04-26 | 北京大学 | On-line measuring system and on-line measuring method for concentration of NO3 free radicals in atmosphere |
| CN106596437B (en) * | 2016-12-30 | 2023-06-20 | 北京大学 | Atmospheric NO 3 Free radical concentration on-line measuring system and method |
| CN108489971A (en) * | 2018-05-17 | 2018-09-04 | 安徽科技学院 | A kind of rapid detection method of nitrogen oxides |
| CN110007026A (en) * | 2019-04-19 | 2019-07-12 | 中国科学院生态环境研究中心 | Trace nitrogen oxides detection method and device in a kind of atmosphere |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150114 Termination date: 20150712 |
|
| EXPY | Termination of patent right or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Dong Yanting Document name: Notification of Termination of Patent Right |