CN105675461A - Calibration method of PM2.5 (particulate matter 2.5) detector - Google Patents
Calibration method of PM2.5 (particulate matter 2.5) detector Download PDFInfo
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- CN105675461A CN105675461A CN201610048614.6A CN201610048614A CN105675461A CN 105675461 A CN105675461 A CN 105675461A CN 201610048614 A CN201610048614 A CN 201610048614A CN 105675461 A CN105675461 A CN 105675461A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000013618 particulate matter Substances 0.000 title abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 9
- 239000008187 granular material Substances 0.000 claims description 17
- OEYQBKYISMRWQB-UHFFFAOYSA-N Santal Chemical compound C=1C(OC)=CC(O)=C(C2=O)C=1OC=C2C1=CC=C(O)C(O)=C1 OEYQBKYISMRWQB-UHFFFAOYSA-N 0.000 claims description 10
- 235000019504 cigarettes Nutrition 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000012780 transparent material Substances 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G01N15/075—
Abstract
The invention discloses a calibration method of a PM2.5 (particulate matter 2.5) detector, characterized by comprising the following steps: (1), placing a PM2.5 detector calibration meter and the PM2.5 detector to be calibrated, into a closed container, and making a gas having initial PM2.5 concentration of 300-500 Mug/m<3>; (2), reading in real time PM2.5 concentration Ci on the PM2.5 detector calibration meter and duty ratio Di on the PM2.5 detector to be calibrated, calculating a particle count according to the duty ratio Di, polynomially fitting with the particle count Pi and the PM2.5 Ci, wherein i=1, 2...n-1; (3) writing a polynomial fitted above into the PM2.5 detector to be calibrated.The calibration method of the PM2.5 detector is simple to operate and low in investment; a calibration equation is made according to the PM2.5 concentration and the duty ratio and written into each PM2.5 detector to be calibrated, equipment runs according to the calibration equitation so that the concentration shown by the detector to be calibrated has good uniformity and accuracy.
Description
Technical field
The invention belongs to the technical field of Calibration of measuring instruments, it is specifically related to a kind of calibrate method of PM2.5 detector.
Background technology
In PM2.5 detector detection air, particle diameter is less than the detector of 2.5 μm of fine particle quality. Although fine particle is the component that in earth atmosphere composition, content is little, but Air quality and visibility meter etc. are had important impact by it. Fine particle particle diameter is little, and it is far away, thus that the impact of HUMAN HEALTH and atmosphere quality is bigger that some fine particle is rich in a large amount of poisonous and harmful substances and residence time length in an atmosphere, fed distance.
PM2.5 detector is mostly that the number of particulate matter is modeled to concentration. It is analog quantity that infrared PM2.5 detector exports: dutycycle. In for some time, normally 30 seconds, sensor exported lower level quantity. Dutycycle is more big, represents PM2.5 granule number more many, and concentration is more high. Cause the PM2.5 granule number quality calculating a constant volume inaccurate owing to granule number size is irregular. PM2.5 calibration steps directly duty cycle conversion be PM2.5 quality export. Laser sensor cost height, power consumption is big. For the amateur occasion of family, infrared PM2.5 detector is cheap, can better react PM2.5 concentration, and tolerance range is also enough.
PM2.5 detector needs calibration before use, more can accurately detect the pollution level of air. The calibrate of existing PM2.5 detector is divided into two parts: one is zero point correction, and two is span calibration. Test box is put into and treats relatively equipment, gas is purified, make the particle concentration of test box drop to infinite approach zero point. Starting automatic gas distribution system after setting particle sampler and concentration, the data then recording detector are in being temporary in database. Going out ug/ grain value under various concentration by test computed in software, write in micro-chip after generating form again, micro-chip only needs the PM2.5 granule density that can read in current environment by tabling look-up. But there is following technical disadvantages in prior art: (1) existing calibration means, cannot mass production;(2) accuracy of guarantee standard gas source concentration it is difficult to; (3) gas source needs to buy, and drops into bigger.
Summary of the invention
In order to solve the problems of the prior art, the present invention provides a kind of calibrate method of PM2.5 detector.
The calibrate method of the PM2.5 detector of the present invention, the method comprises the following steps:
(1) putting into PM2.5 detector standard meter and PM2.5 detector to be calibrated in closed container, manufacturing PM2.5 starting point concentration is 300-500 μ g/m3Gas;
(2) PM2.5 concentration C on PM2.5 detector standard meter is read in real timeiWith dutycycle D on PM2.5 detector to be calibratedi, according to dutycycle DiCount particles number Pi, with granule number PiWith the concentration C of PM2.5iCarry out polynomial fitting, wherein i=1,2......n-1, n, n >=6;
(3) calibration equation that above-mentioned matching obtains is write PM2.5 detector to be calibrated.
The calibrate method of the present invention carries out in closed container, and PM2.5 detector to be calibrated and PM2.5 detector standard meter are in together in identical atmosphere surrounding, and PM2.5 detector standard meter is the detector calibrating certification through professional institution. PM2.5 starting point concentration is set as 300-500 μ g/m3, it is owing to the useful range of PM2.5 concentration is 0-500 μ g/m by PM2.5 detector to be calibrated3. Along with the carrying out of time, PM2.5 particulate matter can be landed and is attached on object, and in air, the concentration of PM2.5 can decline, and the PM2.5 concentration in closed container is a changing value, the PM2.5 detector standard meter PM2.5 concentration C of readingiWith dutycycle D on PM2.5 detector to be calibratediIt is real-time change, multiple PM2.5 concentration C will be obtained like thisi, and the dutycycle D on the PM2.5 detector to be calibrated of correspondencei. Dutycycle D on a PM2.5 detector to be calibratediCorresponding granule number Pi, granule number PiWith PM2.5 normal concentration CiCarrying out matching, the polynomial expression of acquisition writes PM2.5 detector to be calibrated.
Preferably, in the closed container of step (1), put at least two PM2.5 detectors to be calibrated. Put into multiple stage PM2.5 detector to be calibrated in closed container, the calibration of multiple stage PM2.5 detector can be completed simultaneously, it is to increase the efficiency of calibration. Every platform PM2.5 detector all reads Di, obtain granule number PiWith normal concentration CiPolynomial relation, and the granule number P by every platform PM2.5 detectoriWith normal concentration CiPolynomial expression write correspondingly in instrument.
Preferably, step (1) manufactures containing PM2.5 gas by lighting cigarette or santal in closed container. Light cigarette or santal makes closed container PM2.5 concentration rapid rise, and ensure that the basically identical property of PM2.5 particulate matter.
Preferably, in step (1), closed container is made up of transparent material, is provided with small fan in closed container. Closed container can have transparent glass to form, and is convenient to the carrying out of observation experiment outside. Small fan it is provided with, for blowing loose PM2.5 gas so that PM2.5 is evenly distributed in the space of closed container in closed container.
Preferably, PM2.5 detector standard meter and PM2.5 detector to be calibrated are connected to PC by serial ports line respectively, the concentration C of PC PM2.5 on reading PM2.5 detector standard meter in real timeiWith dutycycle D on PM2.5 detector to be calibratedi. PC connects PM2.5 detector standard meter and PM2.5 detector to be calibrated, automatically to obtain PM2.5 normal concentration CiWith dutycycle D on the PM2.5 detector to be calibrated of corresponding timei, obtain data accurately, rapidly.
Preferably, in step (2), dutycycle DiWith granule number PiMeet following relational expression: Pi=2.24 × 106Di 3-2.77×106Di 2+62600Di. Dutycycle DiWith granule number PiMeet relational expression be in the prior art disclosed in.
Preferably, in step (2), method of least squares is adopted to carry out polynomial fitting. Method of least squares is the optimal function coupling that the sum of squares by minimum error finds data, can obtain granule number PiWith normal concentration CiOptimum fit curve.
The useful effect of the present invention is: the calibrate method of PM2.5 detector of the present invention is simple to operate, it is little to drop into; According to the relation of PM2.5 concentration and dutycycle, extrapolating calibration equation, and write every platform detector to be calibrated, equipment works according to calibration equation so that detector concentration to be calibrated shows good consistence and accuracy.
Accompanying drawing explanation
Fig. 1 is the concentration C of PM2.5 in embodiments of the inventioni< 30 μ g/m3Time working curve;
Fig. 2 is the concentration of PM2.5 in embodiments of the invention is 30≤Ci≤140μg/m3Time working curve;
Fig. 3 is the concentration C of PM2.5 in embodiments of the inventioni> 140 μ g/m3Time working curve.
Embodiment
The calibrate method of the PM2.5 detector of the present invention, the method comprises the following steps:
(1) putting into PM2.5 detector standard meter and PM2.5 detector to be calibrated in closed container, manufacturing PM2.5 starting point concentration is 300-500 μ g/m3Gas, owing to PM2.5 particulate matter is along with the carrying out of experiment, can land or be attached on article so that the PM2.5 concentration in closed container space reduces, and PM2.5 concentration finally can be reduced to tens μ g/m3. In closed container, multiple stage PM2.5 detector to be calibrated can be put into, it may be achieved calibrate while multiple stage PM2.5 detector to be calibrated, it is to increase efficiency, saved the time. Manufacture containing PM2.5 gas by lighting cigarette or santal in closed container. By the concentration lighting cigarette or santal can make the PM2.5 rapid rise in container need to us, it is provided with small fan in closed container, for blowing loose PM2.5 gas so that PM2.5 is evenly distributed in vessel space.
(2) PM2.5 detector standard meter and PM2.5 detector to be calibrated are connected to PC by serial ports line, the concentration C of PC PM2.5 on reading PM2.5 detector standard meter in real timeiWith dutycycle D on PM2.5 detector to be calibratedi; According to dutycycle DiCount particles number Pi, dutycycle DiWith granule number PiMeet following relational expression: Pi=2.24 × 106Di 3-2.77×106Di 2+62600Di; Then with granule number PiWith the concentration C of PM2.5iCarry out method of least squares polynomial fitting, wherein i=1,2......n-1, n, n >=6. In order to the accuracy of matching data, the granule number P that will obtainiWith the concentration C of PM2.5iPiecewise fitting, the curve of a PM2.5 detector piecewise fitting to be calibrated is as Figure 1-3. The PM2.5 detector calibration equation to be calibrated obtained is:
When the concentration C of PM2.5i< 30 μ g/m3, calibration equation is: Ci=27.242In (Pi)-15.984, R2=0.9875;
As the concentration 30≤C of PM2.5i≤140μg/m3, calibration equation is: Ci=0.000001Pi 4-0.0004Pi 3+0.0483Pi 2-0.8468Pi+ 69.406, R2=0.9977;
When the concentration C of PM2.5i> 140 μ g/m3, calibration equation is: Ci=38.560608In (Pi)-1.363007, R2=0.990776;
(2) calibration equation that above-mentioned matching obtains is write PM2.5 detector to be calibrated.
Use the PM2.5 detector after above-mentioned calibration, measure the PM2.5 concentration in 10 regions, place, it may also be useful to the laser PM2.5 detector of standard is as ginseng ratio, and the numerical value of the PM2.5 concentration of measurement is as shown in table 1.As shown in Table 1, it may also be useful to the calibrate method of the present invention calibrate after PM2.5 detector to the measured value phase difference of the measured value of PM2.5 and the laser PM2.5 detector of standard at-4 to 3 μ g/m3Between, thus, the PM2.5 detector accuracy after showing to use the calibrate method of the present invention to calibrate is higher, can be used for the calibrate of PM2.5 detector.
Table 1 calibrate after PM2.5 detector and the measuring result of laser PM2.5 detector of standard
Being only the preferred embodiments of the present invention described in upper, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the calibrate method of a PM2.5 detector, it is characterised in that, the method comprises the following steps:
(1) putting into PM2.5 detector standard meter and PM2.5 detector to be calibrated in closed container, manufacturing PM2.5 starting point concentration is 300-500 μ g/m3Gas;
(2) concentration C of PM2.5 on PM2.5 detector standard meter is read in real timeiWith dutycycle D on PM2.5 detector to be calibratedi, according to dutycycle DiCount particles number Pi, with granule number PiWith the concentration C of PM2.5iCarry out polynomial fitting, wherein i=1,2......n-1, n, n >=6;
(3) calibration equation that above-mentioned matching obtains is write PM2.5 detector to be calibrated.
2. the calibrate method of PM2.5 detector according to claim 1, it is characterised in that, in the closed container of step (1), put at least two PM2.5 detectors to be calibrated.
3. the calibrate method of PM2.5 detector according to claim 1, it is characterised in that, step (1), in closed container, manufactures containing PM2.5 gas by lighting cigarette or santal.
4. the calibrate method of PM2.5 detector according to claim 1, it is characterised in that, in step (1), closed container is made up of transparent material, is provided with small fan in closed container.
5. the calibrate method of PM2.5 detector according to claim 1, it is characterized in that, PM2.5 detector standard meter and PM2.5 detector to be calibrated are connected to PC by serial ports line respectively, the concentration C of PC PM2.5 on reading PM2.5 detector standard meter in real timeiWith dutycycle D on PM2.5 detector to be calibratedi。
6. the calibrate method of PM2.5 detector according to claim 1, it is characterised in that, in step (2), dutycycle DiWith granule number PiMeet following relational expression: Pi=2.24 × 106Di 3-2.77×106Di 2+62600Di。
7. the calibrate method of PM2.5 detector according to claim 1, it is characterised in that, in step (2), adopt method of least squares to carry out polynomial fitting.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891080A (en) * | 2016-06-27 | 2016-08-24 | 广东美的制冷设备有限公司 | Calibration method for dust sensor and calibration device |
| CN106525676A (en) * | 2016-11-17 | 2017-03-22 | 深圳市翠云谷科技有限公司 | Particle concentration detection method of particle two-phase flows |
| CN107655800A (en) * | 2017-10-09 | 2018-02-02 | 上海迪勤智能科技有限公司 | A kind of PM2.5 on-line monitoring systems and its check scaling method |
| CN107727545A (en) * | 2017-09-29 | 2018-02-23 | 四川长虹电器股份有限公司 | Smoke Sensor threshold values calibration system and its calibration method |
| CN108333087A (en) * | 2018-02-27 | 2018-07-27 | 法雷奥汽车空调湖北有限公司 | Automobile-used PM2.5 sensor accuracies adjusting apparatus and control logic |
| CN109520899A (en) * | 2018-11-27 | 2019-03-26 | 四川长虹电器股份有限公司 | A kind of air particle concentration detection method and device |
| CN109765338A (en) * | 2018-12-29 | 2019-05-17 | 北京英视睿达科技有限公司 | The bearing calibration of diffusivity environmental contaminants monitoring device and system and replacing options |
| CN110967446A (en) * | 2018-09-28 | 2020-04-07 | 比亚迪股份有限公司 | Parameter targeting method and device, storage medium and electronic equipment |
| CN111664896A (en) * | 2020-07-04 | 2020-09-15 | 北京耀邦环保技术开发有限公司 | Oil smoke concentration measuring device and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891080A (en) * | 2016-06-27 | 2016-08-24 | 广东美的制冷设备有限公司 | Calibration method for dust sensor and calibration device |
| CN106525676A (en) * | 2016-11-17 | 2017-03-22 | 深圳市翠云谷科技有限公司 | Particle concentration detection method of particle two-phase flows |
| CN107727545A (en) * | 2017-09-29 | 2018-02-23 | 四川长虹电器股份有限公司 | Smoke Sensor threshold values calibration system and its calibration method |
| CN107655800A (en) * | 2017-10-09 | 2018-02-02 | 上海迪勤智能科技有限公司 | A kind of PM2.5 on-line monitoring systems and its check scaling method |
| CN108333087A (en) * | 2018-02-27 | 2018-07-27 | 法雷奥汽车空调湖北有限公司 | Automobile-used PM2.5 sensor accuracies adjusting apparatus and control logic |
| CN110967446A (en) * | 2018-09-28 | 2020-04-07 | 比亚迪股份有限公司 | Parameter targeting method and device, storage medium and electronic equipment |
| CN109520899A (en) * | 2018-11-27 | 2019-03-26 | 四川长虹电器股份有限公司 | A kind of air particle concentration detection method and device |
| CN109765338A (en) * | 2018-12-29 | 2019-05-17 | 北京英视睿达科技有限公司 | The bearing calibration of diffusivity environmental contaminants monitoring device and system and replacing options |
| CN111664896A (en) * | 2020-07-04 | 2020-09-15 | 北京耀邦环保技术开发有限公司 | Oil smoke concentration measuring device and method |
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