CN206974882U - Measure the device of Aerosol Extinction - Google Patents

Abstract

The utility model provides a kind of device for measuring Aerosol Extinction, belongs to atmosphere pollution detection technique field.It, which solves existing detection Aerosol Extinction device, needs to be equipped with the technical problem of specific contrast gas source.The present apparatus includes sampling unit, the detection unit being made up of LED emission sources, planoconvex spotlight, resonator, interferometric filter and photomultiplier, the analytic unit being made up of lock-in amplifier and data processing module, air processor is provided with sampling unit, can obtain contrast gas from air at testing location scene by the device is used to detect.The present apparatus has the advantages of simple in construction, accuracy in detection height, easy for installation.

Description

Measure the device of Aerosol Extinction

Technical field

The utility model belongs to atmosphere pollution detection technique field, is related to a kind of device for measuring Aerosol Extinction.

Background technology

In air, the particulate such as dust, smog, cloud cluster is to the chemical process of air, radiation balance, climate change Very important influence is suffered to daily life.Therefore, the detection to the optical characteristics of atmospheric aerosol particle is ground Study carefully a vital task of always atmospheric science, meteorological detection and environmental protection.

In recent years, the rapid development of China's economic is by global concern.However, this quickly economic growth Along with the change of social system, the industrialization and urbanization of height causes many particulates and greenhouse gases to be discharged into Air, a series of environmental problem is brought, there is serious negative effect to sustainable development, while to the daily life of people It is living that there is serious threat with health.The firsthand information of environmental change how is obtained, air physical property is provided exactly And its variation tendency, be current environment fields of measurement a urgent task.

Existing measurement Aerosol Extinction Coefficients major technique has：Laser radar technique and pulse cavity ring-down spectroscopy skill Art etc..Measured based on laser radar technique, can be with a variety of optical property parameters of Simultaneous Inversion aerosol, but cost is high, and it is uncomfortable In general measure, system bulk is big, ambient interferences are big etc..Measured based on pulse Research on Cavity Ring Down Spectroscopy, measurement accuracy is high, but institute It is high with laser cost.In order to solve the deficiency of above two metering system, have also been developed at present based on chamber enhanced spectrum skill The method and apparatus that art measures Aerosol Extinction.Patent name if number of patent application is 201620747266.7 is " one The device of the quick measurement Aerosol Extinction of kind ", the device are included by LED emission sources, planoconvex spotlight, resonator, interference filter The detection unit that mating plate and photomultiplier are formed, the analytic unit being made up of lock-in amplifier and data processing module, and use In the sampling unit of air inlet, the test philosophy of the device is the phase shift size for first testing out nitrogen, is testing out under test gas Phase shift size, analysis contrast is carried out by two groups of data to draw the Aerosol Extinction of under test gas.Although the device is tied Structure is simple, and can realize real-time monitoring, but still has some shortcomings：The test device needs offer standard when being tested Nitrogen gas, therefore the device needs to be equipped with nitrogen cylinder, needs to be changed after nitrogen is finished, otherwise can not enter as a comparison Row detection.In actual application, test device sometimes for being installed in some tall building roofs or other adverse circumstances, Installation difficulty can be greatly increased by setting up nitrogen cylinder, while frequently change nitrogen cylinder also labor intensive material resources.

Utility model content

The purpose of this utility model is above mentioned problem be present for existing technology, it is proposed that one kind measurement aerosol extinction The device of coefficient, the device are provided with gas treatment equipment on sampling unit, can be obtained by carrying out processing to normal atmospheric To contrast gas, it is used to detect without providing specific contrast gas.

The purpose of this utility model can be realized by following technical proposal：A kind of dress for measuring Aerosol Extinction Put, including sampling unit, the detection being made up of LED emission sources, planoconvex spotlight, resonator, interferometric filter and photomultiplier Unit, the analytic unit being made up of lock-in amplifier and data processing module, the sampling unit include three-way air valve, and described three The first interface connection resonator of breather valve, the second interface connection air intake pipe to be measured of the three-way air valve, described three The 3rd interface connection contrast gas inlet pipeline of breather valve, described contrast are provided with gas inlet pipeline for filtering contrast First particulate filter of particulate matter in gas, for eliminating contrast in gas the drier of moisture and contrast gas for eliminating The nitrogen dioxide filter of nitrogen dioxide in body.

Preferably, it is provided with the second particulate filter between the nitrogen dioxide filter and the 3rd interface.

Preferably, the air intake assembly for aiding in gas to enter resonator, the air inlet are provided with the resonator Component is membrane pump, and the membrane pump is arranged on the one end of resonator away from first interface by outlet pipe.

Preferably, it is provided with flow stabilizing valve on the outlet pipe.

Preferably, it is provided with pressure sensor on the outlet pipe.

Preferably, the outside of the detection unit is provided with thermostat.

Preferably, the thermostat is insulating box, the resonator is arranged in insulating box.

The technical scheme provided by this disclosed embodiment can include the following benefits：

The utility model on contrast gas inlet pipeline by setting the first particulate filter, drier and titanium dioxide Nitrogen filter, the particulate matter that will enter in the air in admission line, moisture and nitrogen dioxide composition remove, be allowed to it is most of into It is divided into nitrogen, other gas componants of remaining small part will not then have an impact to testing result, therefore can turn into contrast gas and use. Can obtain gas after setting said apparatus, during detection from the air of detection site scene to carry out processing and be used as contrasting gas and making With, it is not necessary to it is additionally provided contrast gas.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model embodiment one；

Fig. 2 is the structural representation of the utility model embodiment two；

Fig. 3 is the structural representation of the utility model embodiment three；

Fig. 4 is the structural representation of the utility model embodiment four；

Fig. 5 is the structural representation of the utility model embodiment five；

Fig. 6 is the structural representation of the utility model embodiment six；

In figure, 100, LED modulation modules；110、LED；120th, planoconvex spotlight；130th, resonator；140th, photomultiplier； 150th, outlet pipe；160th, membrane pump；170th, flow stabilizing valve；180th, pressure sensor；200th, three-way air valve；201st, first interface； 202nd, the 3rd interface；203rd, second interface；210th, the first particulate filter；220th, drier；230th, gas inlet pipe is contrasted Road；240th, air intake pipe；250th, the second particulate filter；260th, nitrogen dioxide filter；300th, lock-in amplifier； 310th, data processing module；400th, insulating box.

Embodiment

It is specific embodiment of the utility model and with reference to accompanying drawing below, the technical solution of the utility model is made further Description, but the utility model is not limited to these embodiments.

Fig. 1 is a kind of measurement Aerosol Extinction device shown in the embodiment of the present disclosure one, and it is single that the device includes sampling Member, the detection unit being made up of LED emission sources, planoconvex spotlight 120, resonator 130, interferometric filter and photomultiplier 140, The analytic unit being made up of lock-in amplifier 300 and data processing module 310, the sampling unit include three-way air valve 200, institute The first interface 201 for stating three-way air valve 200 connects resonator 130, and the second interface 203 of the three-way air valve 200 connects to be measured Air intake pipe 240, the 3rd interface 202 connection contrast gas inlet pipeline 230 of the three-way air valve 200, the contrast It is provided with gas inlet pipeline 230 and contrasts the first particulate filter 210 of particulate matter in gas, for eliminating for filtering Contrast the drier 220 of moisture and the nitrogen dioxide filter 260 for eliminating contrast nitrogen dioxide in gases in gas.

When Aerosol Extinction detects in air, be first shut off three-way air valve 200 second connects the device Mouth 203, and open the triple feed inlet of three-way air valve 200 so that contrast gas is entered in resonator 130, afterwards LED emission sources On LED modulation modules 100 control LED110 transmitting light extraction the contrast gas in resonator 130 is detected.Contrast gas Source be detection site air, after air enters contrast gas inlet pipeline 230, first pass through the first particulate filter 210 filter out particulate matter, and removing moisture in air is dried in drying device 220, it is noted here that due to drying The gas channel of device 220 is thinner, is easily blocked by particulate matter, therefore air needs to first pass through the first particulate filter 210 and Row filtering.The air dried by drier 220 enters nitrogen dioxide filter 260, removes the nitrogen dioxide in air.It is many Well known, the nitrogen containing component in air is mainly nitrogen (accounts for main), nitrogen dioxide and nitric oxide, wherein nitric oxide production account for Than can be ignored substantially, as long as therefore contrast gas can be used as instead of standard nitrogen to carry out after exclusion nitrogen dioxide Detection.Treated contrast gas is detected after entering resonator 130, and is produced phase shift data and be recorded in data processing In module 310.

After the detection data generation for contrasting gas, the 3rd interface 202 of three-way air valve 200 is closed, and open three-way air valve 200 second interface 203, the contrast gas in resonator 130 is discharged, when it is under test gas that resonator 130 is interior, carried out again Detection, and phase shift data record caused by detection is done into comparative analysis with phase shift data caused by contrast gas and obtains the current ground Aerosol Extinction in point air.

Fig. 2 shows embodiment two, and the difference of embodiment two and embodiment one is embodiment two in three-way air valve The second particulate filter 250 is provided between 200 the 3rd interfaces 202 and nitrogen dioxide filter 260.Currently used dioxy Change nitrogen filter 260 using activated carbon as filter medium, unavoidably can be by the particle in activated carbon after air entered activated carbon Thing is brought into resonator 130, after the contrast gas in resonator 130 carries particulate matter, testing result can be caused to produce inclined Difference.Embodiment two is the improvement project of embodiment one, and the second particulate filter is set after nitrogen dioxide filter 260 250 may filter that the particulate matter that contrast gas is taken out of from activated carbon so that testing result accurate and effective.

Fig. 3 shows the embodiment three of this case, and the difference of embodiment three and embodiment one and embodiment two is embodiment Three are connected with membrane pump on the one end of resonator 130 away from the first interface 201 of three-way air valve 200 by outlet pipe 150 160, more quickly the residual gas in resonator 130 can be extracted out by membrane pump 160 so that produced in resonator 130 Negative pressure, the gas for being easy to be detected are entered in resonator 130.

Fig. 4 shows the example IV of this case, and further improvement of the example IV in embodiment three, example IV is in reality On the basis of applying example three, flow stabilizing valve 170 is provided with outlet pipe 150.Can according to equation PV=nRT under normal state of gas Know that gas pressure can have an impact to testing result, when contrasting gas and pressure difference during air detection to be measured, can cause Aerosol Extinction caused by two groups of data comparisons calculating is inaccurate.The present embodiment sets flow stabilizing valve on outlet pipe 150 After 170, it is ensured that air pressure of the air to be measured with contrast gas in detection in resonator 130 is identical, so as to ensure to detect As a result accurate and effective.

Fig. 5 shows the embodiment five of this case, and embodiment five is another improvement project of embodiment three, and embodiment five exists On the basis of embodiment three, pressure sensor 180 is provided with outlet pipe 150, pressure sensor 180 can test out resonance Air pressure test result is simultaneously sent on data processing module 310 by air pressure in chamber 130.According to equation PV under normal state of gas =nRT understands that the state of air pressure and gas is linear, and the difference of air pressure can when being detected by under test gas and contrast gas Effects of air pressure coefficient is calculated, and the coefficient is eliminated in data processing module 310, is accurately and effectively detected knot Fruit.

Fig. 6 shows the embodiment six of this case, and embodiment six is the further improvement project of example IV and embodiment five, Embodiment six is provided with thermostat, according to Standard Gases on the basis of example IV and embodiment five outside detection unit Equation PV=nRT understands that temperature can be had an impact to gaseous state, and testing result is had an impact, and work as contrast under body state During gas temperature difference both when gas and air detection to be measured, testing result can produce deviation.Embodiment six is single in detection It is first outside thermostat is set after, it is ensured that contrast gas is identical with the temperature both during air detection to be measured during detection, from And ensure testing result accurate and effective.Preferably, setting insulating box 400 in detection unit, and resonator 130 is placed in perseverance In incubator 400, to ensure that it is constant that the gas temperature in resonator 130 is always ensured that.

Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.

Claims (7)

1. a kind of device for measuring Aerosol Extinction, including sampling unit, by LED emission sources, planoconvex spotlight, resonator, The detection unit that interferometric filter and photomultiplier are formed, the analysis list being made up of lock-in amplifier and data processing module Member, it is characterised in that the sampling unit includes three-way air valve, and the first interface connection resonator of the three-way air valve is described The second interface of three-way air valve connects air intake pipe to be measured, the 3rd interface connection contrast gas inlet of the three-way air valve Pipeline, it is described contrast gas inlet pipeline on be provided with for filter contrast gas in particulate matter the first particulate filter, Nitrogen dioxide filter for the drier of moisture in elimination contrast gas and for eliminating contrast nitrogen dioxide in gases.

2. the device of measurement Aerosol Extinction according to claim 1, it is characterised in that the nitrogen dioxide filtering The second particulate filter is provided between device and the 3rd interface.

3. the device of measurement Aerosol Extinction according to claim 1 or 2, it is characterised in that on the resonator The air intake assembly for aiding in gas to enter resonator is provided with, the air intake assembly is membrane pump, and the membrane pump is by going out Feed channel is arranged on the one end of resonator away from first interface.

4. the device of measurement Aerosol Extinction according to claim 3, it is characterised in that set on the outlet pipe It is equipped with flow stabilizing valve.

5. the device of measurement Aerosol Extinction according to claim 3, it is characterised in that set on the outlet pipe It is equipped with pressure sensor.

6. the device of the measurement Aerosol Extinction according to claim 4 or 5, it is characterised in that the detection unit Outside be provided with thermostat.

7. the device of measurement Aerosol Extinction according to claim 6, it is characterised in that the thermostat is perseverance Incubator, the resonator are arranged in insulating box.