CN104359808B - A kind of long distance wireless PM2.5 concentration detection method - Google Patents

A kind of long distance wireless PM2.5 concentration detection method Download PDF

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CN104359808B
CN104359808B CN201410594946.5A CN201410594946A CN104359808B CN 104359808 B CN104359808 B CN 104359808B CN 201410594946 A CN201410594946 A CN 201410594946A CN 104359808 B CN104359808 B CN 104359808B
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image
concentration
imageing sensor
mtf
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CN104359808A (en
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王炳玲
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Shandong Huanxi Monitoring Co., Ltd.
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王炳玲
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Abstract

A kind of long distance wireless PM2.5 concentration detection method belongs to environment automatic monitoring field, is specifically related to a kind of PM2.5 concentration detection method;The method records the time in the image sequence and sequence that two imageing sensors obtain corresponding to each image respectively, calculate under the identical time again, the contrast of correspondence image in two image sequences, and then obtain modulation transfer function (MTF) sequence, take median or the meansigma methods of modulation transfer function (MTF) sequence again, obtain final modulation transfer function (MTF), finally according to the corresponding relation of final modulation transfer function (MTF) Yu PM2.5 concentration, obtain the concentration of PM2.5;Long distance wireless PM2.5 concentration detection method of the present invention, is possible not only to improve measurement result precision, and can reduce detection installation cost.

Description

A kind of long distance wireless PM2.5 concentration detection method
Technical field
A kind of long distance wireless PM2.5 concentration detection method belongs to environment automatic monitoring field, is specifically related to a kind of PM2.5 concentration Detection method.
Background technology
Haze is directly related with PM2.5 particulate matter, by detecting the concentration of PM2.5, haze weather can be carried out quantitative assessment.
Tradition PM2.5 detection method is to be distributed haze monitor in multiple different locations, and this mode precision is higher, but due to mist Haze monitor equipment is complicated, with high content of technology so that testing cost improves the most accordingly.
Showing after deliberation, the concentration of PM2.5 is linear with air visibility, therefore can evaluate letter by air visibility Number obtains the concentration of PM2.5.The patent of invention of Application No. 201410200873 " is evaluated based on non-reference picture definition PM2.5 concentration detector ", it is proposed that a kind of detection apparatus and method utilizing image information to judge PM2.5 concentration, this The bright technical scheme that have employed non-reference picture, obtains the fuzzy accumulated probability of image by measuring multiple targets, then with visibility The fuzzy accumulated probability of clear place image compares, and determines final goal thing, and laser ranging unit measures the distance of final goal thing, PM2.5 concentration display unit calculates PM2.5 concentration by visibility with PM2.5 concentration relationship.
This method can give this area and utilize image to enlighten to the technology monitoring PM2.5, but, its shortcoming is: due to Using the mode of non-reference picture, what therefore measurement result relied on is statistical result, and order of accuarcy is relatively low, additionally, the method institute Corresponding device needs multiple targets and laser range finder, adds the cost of detection device.
Summary of the invention
In order to solve the problems referred to above, the invention discloses a kind of long distance wireless PM2.5 concentration detection method, the present invention is possible not only to Improve measurement result precision, and detection installation cost can be reduced.
The object of the present invention is achieved like this:
A kind of long distance wireless PM2.5 concentration detection method,
Corresponding device includes the laser instrument along the light direction of propagation, pin hole, collimator objective, rectangular raster and Amici prism; Also include the first image-forming objective lens being arranged on Amici prism transmitted light path, the first imageing sensor and sender unit, arrange The second image-forming objective lens on Amici prism reflected light path, the second imageing sensor, signal receiving device and signal processor;
Described pin hole is positioned at the focal position of collimator objective;Rectangular raster and the first imageing sensor lay respectively at the first imaging thing The object plane of mirror and image planes, rectangular raster and the second imageing sensor lay respectively at object plane and the image planes of the second image-forming objective lens;Described Distance between Amici prism and the second imageing sensor is 1000m~1500m;
The laser beam that laser instrument sends forms point source after needle passing hole, then forms directional light after being collimated by collimator objective, is irradiated to On rectangular raster, being divided into two-way from the light of rectangular raster outgoing through Amici prism, road first image-forming objective lens is imaged onto the first figure As sensor surface, another road second image-forming objective lens is imaged onto the second image sensor surface;
The picture signal that first imageing sensor receives is sent to signal receiving device through sender unit, and the second image passes Pass to signal processor together with the picture signal that the picture signal that sensor receives receives with signal receiving device and carry out computing;
Said method comprising the steps of:
Step a, the first imageing sensor, to rectangular raster imaging, obtain the first image sequence, and record in the first image sequence Every time corresponding to piece image;
Step b, the first image sequence and corresponding time are sent to signal receiving device through sender unit, then transmit To signal processor;
Step c, the second imageing sensor, to rectangular raster imaging, obtain the second image sequence, and record in the second image sequence Every time corresponding to piece image;
Step d, the second image sequence and corresponding Time Transmission are to signal processor;
Step e, in signal processor, by the time corresponding to piece image every in the first image sequence and the second image sequence In every time corresponding to piece image contrast, by image in the first image sequence of the identical time with in the second image sequence Image sets composograph pair in row;
Step f, calculate the contrast of each image pair two width image respectively, and in each image pair, utilize and belong to the second figure As the contrast of the image of sequence, divided by the contrast of the image belonging to the first image sequence, the modulation obtaining correspondence image pair passes Delivery function;
Step g, the median taking modulation transfer function (MTF) in step f or the meansigma methods of calculating modulation transfer function (MTF), finally modulated Transmission function;
Step h, corresponding relation according to final modulation transfer function (MTF) Yu PM2.5 concentration, obtain the concentration of PM2.5.
Above-mentioned long distance wireless PM2.5 concentration detection method, in step h, final modulation transfer function (MTF) is corresponding with PM2.5 concentration closes System, is obtained by scaling method.
Described scaling method, obtains the concentration value of PM2.5, by claim 1 by existing PM2.5 concentration detection method Step a, to the method for step g, obtains final modulation transfer function (MTF), then forms final modulation transmission letter with the concentration value of PM2.5 Number-PM2.5 concentration array.
Above-mentioned scaling method, also includes the step that multiple final modulation transfer function (MTF)-PM2.5 concentration arrays fit to curve.
Beneficial effect:
The first, owing to, gathering image when, have recorded imaging time, it is ensured that be used for calculating modulation transfer function (MTF) simultaneously Two width image stringent synchronization, be conducive to improve measurement result precision.
The second, use modulation transfer function (MTF) as evaluation function due to the method, substantially belong to the detection method having reference picture, Relative to non-reference picture detection method, it is not necessary to carry out statistical calculation, therefore it is equally beneficial for improving measurement result precision.
3rd, owing to the method is without carrying out statistical calculation, therefore corresponding device both without configuring multiple target, again without Configuration laser range finder, has the most again the beneficial effect reducing equipment cost.
Accompanying drawing explanation
Fig. 1 is the index path of device corresponding to the inventive method.
In figure: 1 laser instrument, 2 pin holes, 3 collimator objectives, 4 rectangular rasters, 5 Amici prisms, 6 first image-forming objective lens, 7 One imageing sensor, 8 sender units, 9 second image-forming objective lens, 10 second imageing sensors, 11 signal receiving devices, 12 signal processors.
Detailed description of the invention
Below the specific embodiment of the invention is described in further detail.
Specific embodiment one
The long distance wireless PM2.5 concentration detection method of the present embodiment,
Corresponding device includes the laser instrument 1 along the light direction of propagation, pin hole 2, collimator objective 3, rectangular raster 4 and light splitting Prism 5;Also including the first image-forming objective lens 6 being arranged on Amici prism 5 transmitted light path, the first imageing sensor 7 and signal are sent out Injection device 8, the second image-forming objective lens 9 being arranged on Amici prism 5 reflected light path, the second imageing sensor 10, signal receives Device 11 and signal processor 12;
Described pin hole 2 is positioned at the focal position of collimator objective 3;Rectangular raster 4 and the first imageing sensor 7 lay respectively at The object plane of one image-forming objective lens 6 and image planes, rectangular raster 4 and the second imageing sensor 10 lay respectively at the thing of the second image-forming objective lens 9 Face and image planes, index path is as shown in Figure 1;The described distance between Amici prism 5 and the second imageing sensor 10 is 1000m~1500m;
The laser beam that laser instrument 1 sends forms point source after needle passing hole 2, then forms directional light after being collimated by collimator objective 3, It is irradiated on rectangular raster 4, is divided into two-way from the light of rectangular raster 4 outgoing through Amici prism 5, road first image-forming objective lens 6 are imaged onto the first imageing sensor 7 surface, and another road second image-forming objective lens 9 is imaged onto the second imageing sensor 10 surface;
The picture signal that first imageing sensor 7 receives is sent to signal receiving device 11 through sender unit 8, and second Signal processing is passed to together with the picture signal that the picture signal that imageing sensor 10 receives receives with signal receiving device 11 Device 12 carries out computing;
Said method comprising the steps of:
Step a, the first imageing sensor 7, to rectangular raster 4 imaging, obtain the first image sequence, and record the first image sequence Every time corresponding to piece image in row;
Step b, the first image sequence and corresponding time are sent to signal receiving device 11 through sender unit 8, then Pass to signal processor 12;
Step c, the second imageing sensor 10, to rectangular raster 4 imaging, obtain the second image sequence, and record the second image sequence Every time corresponding to piece image in row;
Step d, the second image sequence and corresponding Time Transmission are to signal processor 12;
Step e, in signal processor 12, by the time corresponding to piece image every in the first image sequence and the second image sequence In row, every time corresponding to piece image contrasts, by image in the first image sequence of the identical time with at the second image Image sets composograph pair in sequence;
Step f, calculate the contrast of each image pair two width image respectively, and in each image pair, utilize and belong to the second figure As the contrast of the image of sequence, divided by the contrast of the image belonging to the first image sequence, the modulation obtaining correspondence image pair passes Delivery function;
Step g, take the median of modulation transfer function (MTF) in step f, obtain final modulation transfer function (MTF);
Step h, corresponding relation according to final modulation transfer function (MTF) Yu PM2.5 concentration, obtain the concentration of PM2.5.
Above-mentioned long distance wireless PM2.5 concentration detection method, in step h, final modulation transfer function (MTF) is corresponding with PM2.5 concentration closes System, is obtained by scaling method.Specifically, obtained the concentration value of PM2.5 by existing PM2.5 concentration detection method, pass through Claim 1 step a, to the method for step g, obtains final modulation transfer function (MTF), then forms final with the concentration value of PM2.5 Modulation transfer function (MTF)-PM2.5 concentration array.
Above-mentioned scaling method, also includes the step that multiple final modulation transfer function (MTF)-PM2.5 concentration arrays fit to curve.
Specific embodiment two
The long distance wireless PM2.5 concentration detection method of the present embodiment, different from specific embodiment one are, described step g For: take the meansigma methods of modulation transfer function (MTF) in step f, obtain final modulation transfer function (MTF).
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structure change made under the enlightenment of the present invention Or method improvement, every have same or like technical scheme, within each falling within protection scope of the present invention with the present invention.

Claims (4)

1. a long distance wireless PM2.5 concentration detection method,
Corresponding device includes the laser instrument (1) along the light direction of propagation, pin hole (2), collimator objective (3), rectangular raster And Amici prism (5) (4);Also include the first image-forming objective lens (6) being arranged on Amici prism (5) transmitted light path, first Imageing sensor (7) and sender unit (8), the second image-forming objective lens (9) being arranged on Amici prism (5) reflected light path, Second imageing sensor (10), signal receiving device (11) and signal processor (12);
Described pin hole (2) is positioned at the focal position of collimator objective (3);Rectangular raster (4) and the first imageing sensor (7) Lay respectively at object plane and the image planes of the first image-forming objective lens (6), rectangular raster (4) and the second imageing sensor (10) position respectively Object plane and image planes in the second image-forming objective lens (9);Between described Amici prism (5) and the second imageing sensor (10) Distance is 1000m~1500m;
The laser beam that laser instrument (1) sends forms point source after needle passing hole (2), then is formed by after collimator objective (3) collimation Directional light, is irradiated on rectangular raster (4), is divided into two-way from the light of rectangular raster (4) outgoing through Amici prism (5), and one Road the first image-forming objective lens (6) is imaged onto the first imageing sensor (7) surface, another road the second image-forming objective lens (9) imaging To the second imageing sensor (10) surface;
The picture signal that first imageing sensor (7) receives is sent to signal receiving device (11) through sender unit (8), Transmit together with the picture signal that the picture signal that second imageing sensor (10) receives receives with signal receiving device (11) Computing is carried out to signal processor (12);
It is characterized in that, said method comprising the steps of:
Step a, the first imageing sensor (7), to rectangular raster (4) imaging, obtain the first image sequence, and record first Every time corresponding to piece image in image sequence;
Step b, the first image sequence and corresponding time are sent to signal receiving device (11) through sender unit (8), Pass to signal processor (12) again;
Step c, the second imageing sensor (10), to rectangular raster (4) imaging, obtain the second image sequence, and record second Every time corresponding to piece image in image sequence;
Step d, the second image sequence and corresponding Time Transmission are to signal processor (12);
Step e, in signal processor (12), by the time corresponding to piece image every in the first image sequence and the second figure Time as corresponding to piece image every in sequence contrasts, by image in the first image sequence of the identical time with second Image sets composograph pair in image sequence;
Step f, calculate the contrast of each image pair two width image respectively, and in each image pair, utilize and belong to the second figure As the contrast of the image of sequence, divided by the contrast of the image belonging to the first image sequence, the modulation obtaining correspondence image pair passes Delivery function;
Step g, the median taking modulation transfer function (MTF) in step f or the meansigma methods of calculating modulation transfer function (MTF), finally modulated Transmission function;
Step h, corresponding relation according to final modulation transfer function (MTF) Yu PM2.5 concentration, obtain the concentration of PM2.5.
Long distance wireless PM2.5 concentration detection method the most according to claim 1, it is characterised in that final in step h Modulation transfer function (MTF) and the corresponding relation of PM2.5 concentration, obtained by scaling method.
Long distance wireless PM2.5 concentration detection method the most according to claim 2, it is characterised in that described demarcation side Method, obtains the concentration value of PM2.5, by claim 1 step a to step g by existing PM2.5 concentration detection method Method, obtains final modulation transfer function (MTF), then forms final modulation transfer function (MTF)-PM2.5 concentration array with the concentration value of PM2.5.
Long distance wireless PM2.5 concentration detection method the most according to claim 3, it is characterised in that also include multiple Final modulation transfer function (MTF)-PM2.5 concentration array fits to the step of curve.
CN201410594946.5A 2014-10-30 2014-10-30 A kind of long distance wireless PM2.5 concentration detection method Active CN104359808B (en)

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EP1510798B1 (en) * 2003-08-28 2006-12-27 Siemens Aktiengesellschaft Wavelength modulation spectroscopy method and system
CN1327209C (en) * 2005-02-25 2007-07-18 天津大学 Flow-type imaging particle measurer and its measuring method
CN1800820A (en) * 2005-12-20 2006-07-12 上海理工大学 Pollutant gas concentration field measurement method in environmental wind tunnel
JP5046076B2 (en) * 2005-12-22 2012-10-10 独立行政法人日本原子力研究開発機構 Remotely selected image measurement method for aerosols containing specific substances
CN101718670B (en) * 2009-12-10 2011-05-18 天津同阳科技发展有限公司 Device and method for simultaneously monitoring flue gas particles and polluted gases on line
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Inventor after: Wang Bingling

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