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A pm2.5 monitoring method based on modulation transfer function

A modulation transfer function, MTF-PM2.5 technology, applied in measurement devices, suspension and porous material analysis, particle suspension analysis, etc. The effect of monitoring real-time performance, reducing the amount of calculation, and simple operation

Active Publication Date: 2016-11-23
SHAANXI MING LU OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This method can give the technical enlightenment of using images to monitor PM2.5 in the field. However, its disadvantages are: due to the use of no reference images, multiple targets and laser rangefinders are required, not only the detection cost is high, but also the test The steps are cumbersome, the amount of calculation is large, and the real-time performance is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] The PM2.5 monitoring method based on the modulation transfer function of the present embodiment comprises the following steps:

[0022] Step a, Calibration:

[0023] Place the test plate with the black and white stripe pattern in front of the imaging system, and the imaging system will image it. The contrast of the object-space pattern is C1, and the contrast of the image-space pattern is C2. At a certain moment, the modulation transfer function (MTF) is obtained For C2 / C1, at the same time, use the existing PM2.5 detection technology to detect the concentration of PM2.5, and get the MTF-PM2.5 concentration array; connect all the MTF-PM2.5 concentration arrays under different PM2.5 concentrations into curve to obtain the MTF-PM2.5 concentration curve;

[0024] Among them, the method of obtaining the MTF-PM2.5 concentration curve is: directly connect the MTF-PM2.5 concentration array with a straight line in the order of PM2.5 concentration from small to large; this stra...

specific Embodiment 2

[0027] The PM2.5 monitoring method based on the modulation transfer function of the present embodiment comprises the following steps:

[0028] Step a, Calibration:

[0029] Place the test plate with the black and white stripe pattern in front of the imaging system, and the imaging system will image it. The contrast of the object-space pattern is C1, and the contrast of the image-space pattern is C2. At a certain moment, the modulation transfer function (MTF) is obtained For C2 / C1, at the same time, use the existing PM2.5 detection technology to detect the concentration of PM2.5, and get the MTF-PM2.5 concentration array; connect all the MTF-PM2.5 concentration arrays under different PM2.5 concentrations into curve to obtain the MTF-PM2.5 concentration curve;

[0030] Among them, the method of obtaining the MTF-PM2.5 concentration curve is: according to the number n of the MTF-PM2.5 concentration array, use an n-degree polynomial to fit;

[0031] The polynomial fitting method...

specific Embodiment 3

[0035] The PM2.5 monitoring method based on the modulation transfer function of the present embodiment is after the MTF-PM2.5 concentration curve has been drawn, the PM2.5 monitoring method performed, only includes step b, monitoring: monitoring the air quality, Substitute the MTF monitoring value into the MTF-PM2.5 concentration curve to obtain the PM2.5 concentration value.

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Abstract

The invention discloses a modulation-transfer-function-based PM2.5 (Particulate Matter 2.5) monitoring method, belongs to the field of automatic monitoring of environment, and particularly relates to a PM2.5 monitoring method. The monitoring method comprises the following steps: drawing a MTF-PM2.5 (Modulation Transfer Function-Particulate Matter 2.5) concentration curve by calibrating first, and then substituting an MTF monitoring value into the MTF-PM2.5 concentration curve to obtain a PM2.5 concentration value; or on the premise that the MTF-PM2.5 concentration curve is drawn, directly substituting the MTF monitoring value into the MTF-PM2.5 concentration curve to obtain the PM2.5 concentration value. The PM2.5 is monitored by using the modulation-transfer-function-based PM2.5 monitoring method disclosed by the invention, the cost can be reduced, the calculation amount can be reduced, and the monitoring real-time performance can be improved.

Description

technical field [0001] A PM2.5 monitoring method based on a modulation transfer function belongs to the field of environmental automatic monitoring, and specifically relates to a PM2.5 monitoring method. Background technique [0002] Haze is directly related to PM2.5 particulate matter. By monitoring the concentration of PM2.5, the haze weather can be quantitatively evaluated. [0003] The traditional PM2.5 monitoring method is to distribute smog monitors in different locations. This method has higher accuracy, but the cost of smog monitors also increases accordingly. [0004] Studies have shown that the concentration of PM2.5 has a linear relationship with the visibility of the air, so the concentration of PM2.5 can be obtained by evaluating the visibility of the air. The invention patent with the application number of 201410200873 "PM2.5 Concentration Detector Based on No Reference Image Clarity Evaluation" proposes a detection device and method for judging PM2.5 concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06
Inventor 石朝力
Owner SHAANXI MING LU OPTICAL TECH