CN209264551U - Content of nitrogen dioxide detection device - Google Patents
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- CN209264551U CN209264551U CN201822092806.4U CN201822092806U CN209264551U CN 209264551 U CN209264551 U CN 209264551U CN 201822092806 U CN201822092806 U CN 201822092806U CN 209264551 U CN209264551 U CN 209264551U
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Abstract
The utility model discloses a kind of content of nitrogen dioxide detection devices, the detection device includes air intake, the air intake connection first enters gas branch and second and enters gas branch, described first enters gas branch and second enters the entrance that gas branch is connected to branch gating component, and second, which enters gas branch road, is provided with nitrogen dioxide filter;It further comprise photometer and data processor, the outlet of branch gating component is connected to photometer, and the photometer includes light source;The data processor obtains the luminosity information of photometer acquisition and calculates content of nitrogen dioxide.The detection method.The device is the device that a kind of chemical optics method detects content of nitrogen dioxide, it is possible to reduce zero point and span drift substantially reduce the frequency of calibration, and detection accuracy is high.
Description
Technical field
The present invention relates to gas detection technology fields, and in particular to a kind of content of nitrogen dioxide detection device.
Background technique
Nitrogen dioxide is one of main Gaseous Pollutants, to the irritating effect of the respiratory system of human body, for a long time
The respiratory diseases such as bronchitis, asthma can be induced by being exposed under high-concentration nitrogen dioxide.Two in Accurate Determining surrounding air
Nitric oxide concentration for understand atmosphere pollution mechanism, judge atmospheric pollution level, determine pollution source, carry out air quality it is pre-
Police, and help formulate reasonable urban planning etc. and all have great importance.
The detection method of nitrogen dioxide mainly has spectrophotometry and chemoluminescence method.Spectrophotometry needs first by air
Sample is measured again after being trapped by absorbent solution, thus heavy workload, and acquisition data time resolution ratio is low, method sensitivity
It is poor.Chemoluminescence method detection nitrogen dioxide have high sensitivity, the good, measurement range of selectivity is big, do not need chemical reagent and
The advantages of real-time online detects is one of main method to be used of surrounding air on-line monitoring.However chemoluminescence method is actually
Nitric oxide can only be directly detected, the detection of nitrogen dioxide is first to be converted into nitrogen dioxide by molybdenum filament or photodissociation converter
Then nitric oxide is detected again, therefore the key detected is that nitrogen dioxide is converted into nitric oxide production transfer efficiency.So
And the factors such as the temperature of molybdenum filament or photodissociation converter, content of nitrogen dioxide, sample throughput can all influence transfer efficiency.In order to obtain
Accurate nitrogen dioxide measurement is obtained, Instrument Design is sufficiently complex.
If a kind of device for directly detecting content of nitrogen dioxide in surrounding air using optical means can be studied, it will
It is more easier detection and accurately.
Summary of the invention
The present invention for the above technical problems, proposes and carries out content of nitrogen dioxide detection based on optical means
Device can directly detect environment nitrogen dioxide ingredient.
To achieve the goals above, the present invention provides the following technical scheme that
A kind of content of nitrogen dioxide detection device, including air intake, the air intake connection first enter gas branch and second
Enter gas branch, described first enters gas branch and second enters the entrance that gas branch is connected to branch gating component, and second enters gas branch
On be provided with nitrogen dioxide filter;It further comprise photometer and data processor, the outlet of branch gating component is connected to
Photometer, the photometer include light source;The data processor obtains the luminosity information of photometer acquisition and calculates titanium dioxide
Nitrogen concentration.
Preferably, processor includes:
Data acquisition unit: for acquiring the luminosity information of photometer measurement;
Calibration coefficient computing unit: photometer calibration system is calculated for the luminosity information based on standard nitrogen dioxide gas
Number, the standard nitrogen dioxide gas are the nitrogen dioxide gas of known concentration;
Content of nitrogen dioxide computing unit: for luminosity information and the calculating of calibration coefficient computing unit based under test gas
Calibration coefficient, calculate content of nitrogen dioxide.
Preferably, photometer further comprises gas chamber and detector, and the detector uses silicon photoelectric diode, the gas
Room uses White's type long light path gas chamber.
Preferably, the content of nitrogen dioxide measurement device further comprises temperature sensor and pressure sensor, temperature
Sensor and pressure sensor are connected to photometer, for measuring the temperature and pressure in photometer.
Preferably, content of nitrogen dioxide measurement device further comprises air pump, and the air pump is connected to photometric outlet.
Preferably, air pump selects membrane pump.
Preferably, content of nitrogen dioxide measurement device further comprises capillary flow straightener, and setting is exported in photometer
In gas circuit between air pump.
Preferably, content of nitrogen dioxide measurement device further comprises that gas is arranged between branch gating component and photometer
The wetting balance pipe of road.
Preferably, wetting balance pipe uses membrane type osmos tube.
Preferably, branch gating component is three-way magnetic valve.
Compared with prior art, the advantages and positive effects of the present invention are:
(1) Nitrogen dioxide testing is carried out using the principle based on Beer-Lambert law, is directly inhaled according to the light of nitrogen dioxide
It receives characteristic and calculates content of nitrogen dioxide, reduce zero point and span drift, substantially reduce the frequency of calibration, detection accuracy is high.It should
Method is by the way of being alternately passed through background gas and sample gas, so that insensitive to light source fluctuation, stability is more preferable.
(2) nitrogen dioxide can be directly measured, avoids and needs first to convert nitrogen dioxide in conventional chemoluminescence method
For nitric oxide production process, without being lost caused by transformation efficiency.
(3) modularized design, the dynamic model that can be detected by the adjusting of gas absorption cell length come flexible modulation are used
It encloses and sensitivity.
(4) small in size, light-weight, it is convenient for carrying;It is low in energy consumption, lithium battery power supply can be used, without other auxiliary facilities
Demand.It can be realized the purpose detected whenever and wherever possible.For lightweight portable ambient air nitrogen dioxide analyzer.
Detailed description of the invention
Fig. 1 is content of nitrogen dioxide structure diagram of detection device of the present invention;
Fig. 2 is nitrogen dioxide characteristic absorption spectrum schematic diagram;
Fig. 3 is processor structure schematic diagram;
Fig. 4 is the first content of nitrogen dioxide measuring method flow chart of the invention;
Fig. 5 is second of content of nitrogen dioxide measuring method flow chart of the invention.
100- content of nitrogen dioxide detection device, 101- second branch, the 102- first branch, the filtering of 103- nitrogen dioxide
Device, 104- three-way magnetic valve, 105- wetting balance device, 106- photometer, 1061- light source, 1062- gas chamber, 1063- detector,
107- photometer entrance, the outlet of 108- photometer, 109- temperature sensor, 110- pressure sensor, 111- capillary current stabilization
Device, 112- air pump.
Specific embodiment
Hereinafter, a specific embodiment of the invention is further described in conjunction with attached drawing.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.
Present invention firstly provides a kind of content of nitrogen dioxide measurement devices, can be used for the measurement of content of nitrogen dioxide.
A kind of content of nitrogen dioxide detection device 100, structural reference Fig. 1, including air intake, air intake connection first enter gas
Branch 102 and second enters gas branch 101, and first, which enters gas branch 102 and second, enters gas branch 101 and be connected to branch gating component
Entrance, second enters to be provided with nitrogen dioxide filter 103 on gas branch 101;It further comprise photometer 106 and data processing
Device, the outlet of branch gating component are connected to photometer entrance 107.Wherein, branch gating component is for controlling the first branch 102
Or the connection of second branch 101 and photometer 106, and simultaneously, only the gas of branch accesses photometer 106 all the way.This implementation
In example, branch gating component uses three-way magnetic valve 104, can be placed in the position or two-in-one position of gas circuit one-to-two,
Namely in the front end or rear end of nitrogen dioxide filter 103, using PTFE valve body.By the control of solenoid valve, so that passing through
Nitrogen dioxide filter (second enters gas branch 101) and (first enters gas branch not by nitrogen dioxide filter nitrogen dioxide
102) gas circuit alternate communication.
Tracheae in above-mentioned gas circuit is using the material for not adsorbing nitrogen dioxide, for example, PTFE material or FPA material can be selected
Material, to reduce the adsorption loss to nitrogen dioxide.Second enters to be equipped in nitrogen dioxide filter 103 on gas branch 101 and two
The particle of nitrogen oxide reaction, can only eliminate nitrogen dioxide ingredient, without influencing the other compositions in sample gas.
Fig. 2 show nitrogen dioxide in the characteristic absorption spectrum of visible spectrum, and the peak value of characteristic absorption is on the left side 400nm
The right side has stronger absorption in the position of characteristic absorption peaks, can choose and carry out the photometry of nitrogen dioxide in this spectral coverage
Detection can obtain maximum signal-to-noise ratio in this way, reduce interference, improve detection accuracy.
Based on this, the photometer 106 used to content of nitrogen dioxide detection device of the present invention is designed as follows.Photometer
106 structure includes at least light source, gas chamber and detector.Photometric wavelength selection central wavelength is 400nm, and bandwidth is not more than
10nm.It can choose the light source of different wave length type, such as broadband light source or narrow-band light source.Specifically embodiment is such as
Under.(1) broadband light source for selecting visible spectrum, it is 400nm, band that central wavelength, which is added, at light source output end or detector end
Width is no more than the narrow band filter of 10nm;(2) select central wavelength for 400nm, bandwidth is the LED light source of 10nm;(3) wave is selected
The laser diode of a length of 400nm.Detector is silicon photoelectric diode.The light path of gas chamber should be greater than 2 meters, and volume is less than 50 millis
It rises, guarantee has sufficiently fast flushing frequency.It is long light path gas chamber that the gas chamber of photometer 106, which uses, is provided with gas in gas chamber
Absorption cell.
Data processor and photometer 106 carry out signal communication, obtain the luminosity information that photometer 106 acquires, and calculate
Generate content of nitrogen dioxide.Processor specifically includes:
Data acquisition unit: for acquiring the luminosity information of photometer measurement;
Calibration coefficient computing unit: photometer calibration system is calculated for the luminosity information based on standard nitrogen dioxide gas
Number, standard nitrogen dioxide gas are the nitrogen dioxide gas of known concentration;
Content of nitrogen dioxide computing unit: for luminosity information and the calculating of calibration coefficient computing unit based under test gas
Calibration coefficient, calculate content of nitrogen dioxide.
In order to guarantee that more accurate measurement accuracy, content of nitrogen dioxide measurement device further comprise temperature sensor 109
With pressure sensor 110, temperature sensor 109 and pressure sensor 110 are connected to photometer 106, for measuring photometer 106
Interior temperature and pressure, for calculating content of nitrogen dioxide.The calculation method of this content of nitrogen dioxide with it is provided by the invention
Method belongs to redundant arithmetic, belongs to calculation method well known in the prior art, details are not described herein again.
In order to guarantee fluency of the gas by analyzer, content of nitrogen dioxide measurement device further comprises air pump 112,
Air pump 112 is connected to photometer outlet 108.It is membrane pump that air pump 112, which uses, between the outlet of photometer 106 and air pump 112
Gas circuit on be arranged capillary flow straightener 111, capillary flow straightener 111 can be with flow in stability contorting gas circuit, it is ensured that stream
Amount is stablized.
In order to further decrease influence of the gas humidity to measurement accuracy, content of nitrogen dioxide detection device further comprises
Wetting balance pipe 105 between branch gating component and photometer 106 in gas circuit is set.Above-mentioned wetting balance pipe 106 is one
Kind membrane type osmos tube can only reach equilibrium state by the humidity that hydrone hydroxy exchanges inside and outside the tube wall made, cannot breathe freely,
Therefore other gases are unaffected, can keep the wetting balance in pipe and outside pipe.The present embodiment selects to be Bo Chun company
Na Fen pipe.
Above-mentioned content of nitrogen dioxide measurement device has commercial power interface and lithium battery interface, and mains-supplied can be used, can also
Using lithium battery power supply, allow to use whenever and wherever possible.Since lithium battery power supply can be used, instrument can further improve just
The property taken is not limited by the use of condition of power supply.
The present invention further provides content of nitrogen dioxide measuring method, which can take the following two kinds mode
Implement.Following two embodiment is required to use nitrogen dioxide calibrating gas, the difference is that one is use nitrogen dioxide
Calibrating gas calculates photometric calibration coefficient, and another kind is in such a way that nitrogen dioxide calibrating gas and nitrogen combine
To calculate photometric calibration coefficient.The nitrogen dioxide calibrating gas that the present embodiment uses for bottled nitrogen dioxide calibrating gas,
For the gaseous mixture of nitrogen dioxide and nitrogen, i.e., it joined a certain amount of nitrogen dioxide in nitrogen.
First way, process refer to Fig. 4.
A kind of content of nitrogen dioxide measuring method is detected using above-mentioned content of nitrogen dioxide, comprising the following steps:
(1) calibration coefficient is calculated
Select known concentration CkNitrogen dioxide as calibrating gas, calibrating gas is entered into gas branch through first and is passed through luminosity
Meter, processor acquire the first light intensity signal Ik, calibrating gas is further entered into gas branch by photometer through second, processor is adopted
Collect the 5th light intensity signal I'k0, process second enters the nitrogen dioxide calibrating gas of gas branch, and nitrogen therein is filtered;
Based on the first light intensity signal and the 5th light intensity signal, the concentration of calibrating gas and the relationship of light intensity signal, it is fixed to calculate
Coefficient k is marked,
The concentration of gas and the relationship of light intensity signal are as follows:
It calculates and obtains calibration coefficient:
(2) content of nitrogen dioxide is calculated
By surrounding air to be measured through the first branch by photometer, processor acquires third light intensity signal I, by ring to be measured
For border air through second branch by photometer, processor acquires the 4th light intensity signal I0, by the gas of second branch, to go
Except the gas after nitrogen dioxide;
Calculate content of nitrogen dioxide:
The second way, process refer to Fig. 5.
(1) calibration coefficient is calculated
Select known concentration CkNitrogen dioxide gas as calibrating gas, calibrating gas is entered into gas branch through first and is passed through
Photometer, processor acquire the first light intensity signal Ik1, nitrogen is further entered into gas branch by photometer through first, processor is adopted
Collect the second light intensity signal Ik0;
Based on the first light intensity signal and the second light intensity signal, the concentration of calibrating gas and the relationship of light intensity signal, it is fixed to calculate
Mark coefficient k;
The concentration of gas and the relationship of light intensity signal are as follows:
It calculates and obtains calibration coefficient:
By surrounding air to be measured through the first branch by photometer, processor acquires third light intensity signal I, by ring to be measured
For border air through second branch by photometer, processor acquires the 5th light intensity signal I0;
Calculate content of nitrogen dioxide:
Content of nitrogen dioxide measurement device provided by the invention, it is small in size, light-weight, it is convenient for carrying;It is low in energy consumption, it can adopt
Use lithium battery power supply.Content of nitrogen dioxide measuring method provided by the invention is the direct nitrogen dioxide carried out based on photometry
The measuring method of concentration does not need progress nitrogen dioxide and converts to nitric oxide production gas process, do not need to carry out complicated gas
The processing of body advance sample, method are simple and efficient, and measurement result is accurate.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of content of nitrogen dioxide detection device, it is characterised in that: including air intake, the air intake connection first enters gas branch
Road and second enters gas branch, and described first enters gas branch and second enters the entrance that gas branch is connected to branch gating component, and second
Enter gas branch road and is provided with nitrogen dioxide filter;It further comprise photometer and data processor, branch gating component goes out
Mouth is connected to photometer, and the photometer includes light source;The data processor obtains the luminosity information of photometer acquisition and counts
Calculate content of nitrogen dioxide.
2. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: the processor includes:
Data acquisition unit: for acquiring the luminosity information of photometer measurement;
Calibration coefficient computing unit: photometer calibration coefficient, institute are calculated for the luminosity information based on standard nitrogen dioxide gas
State the nitrogen dioxide gas that standard nitrogen dioxide gas is known concentration;
Content of nitrogen dioxide computing unit: for based under test gas luminosity information and calibration coefficient computing unit calculate determine
Coefficient is marked, content of nitrogen dioxide is calculated.
3. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: photometer further comprise gas chamber and
Detector, the detector use silicon photoelectric diode, and the gas chamber uses White's type long light path gas chamber.
4. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: the content of nitrogen dioxide measurement dress
Setting further comprises temperature sensor and pressure sensor, and temperature sensor and pressure sensor are connected to photometer, for surveying
Measure the temperature and pressure in photometer.
5. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: the content of nitrogen dioxide measurement dress
Setting further comprises air pump, and the air pump is connected to photometric outlet.
6. content of nitrogen dioxide detection device as claimed in claim 5, it is characterised in that: air pump selects membrane pump.
7. content of nitrogen dioxide detection device as claimed in claim 5, it is characterised in that: the content of nitrogen dioxide measurement dress
Setting further comprises capillary flow straightener, is arranged in the gas circuit between photometer outlet and air pump.
8. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: the content of nitrogen dioxide measurement dress
Setting further comprises the wetting balance pipe being arranged between branch gating component and photometer in gas circuit.
9. content of nitrogen dioxide detection device as claimed in claim 8, it is characterised in that: the wetting balance pipe uses membrane type
Osmos tube.
10. content of nitrogen dioxide detection device as described in claim 1, it is characterised in that: branch gating component is three energizations
Magnet valve.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109358005A (en) * | 2018-12-13 | 2019-02-19 | 青岛海纳光电环保有限公司 | Content of nitrogen dioxide detection device and method |
CN111289453A (en) * | 2020-03-17 | 2020-06-16 | 南通鑫铭环保技术有限公司 | Detection device for nitrogen dioxide and use method thereof |
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2018
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109358005A (en) * | 2018-12-13 | 2019-02-19 | 青岛海纳光电环保有限公司 | Content of nitrogen dioxide detection device and method |
CN111289453A (en) * | 2020-03-17 | 2020-06-16 | 南通鑫铭环保技术有限公司 | Detection device for nitrogen dioxide and use method thereof |
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Address after: 379 Hedong Road, Qingdao High-tech Zone, Shandong Province Patentee after: Qingdao Laoying Haina Photoelectric Environmental Protection Group Co., Ltd. Address before: High tech Zone of Shandong Province, Qingdao City, 266109 East Road No. 379 Patentee before: Qingdao Haina Guangdian Environmental Protection Co., Ltd. |
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