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Light-scattering-method-based PM2.5 monitor calibration method and device

A technology of light scattering method and calibration method, which is applied in the field of testing, can solve problems such as low calibration efficiency, complicated calibration process of PM2.5 monitors, and difficulty in traceability to quality standards, so as to save testing costs, fast measurement speed, and simple structure reasonable effect

Inactive Publication Date: 2016-05-11
ZHEJIANG MEASUREMENT SCI RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems of the prior art that the PM2.5 monitor calibration process is complicated, the calibration efficiency is low, and it is difficult to trace the source to the quality standard, the present invention provides a PM2.5 monitor calibration device and method based on the light scattering method to achieve Real-time online measurement, fast measurement speed, high sensitivity, good repeatability, low cost, and continuous determination

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  • Light-scattering-method-based PM2.5 monitor calibration method and device

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Embodiment 1

[0020] Such as figure 1 and 2 As shown, a PM2.5 monitor calibration device based on the light scattering method, which includes a monodisperse aerosol generator 1 , a detection module 3 , and a mixing chamber 4 connected in sequence. figure 1 The up and down direction is the Y-axis direction; the left-right direction is the X-axis direction; figure 2 The upper and lower directions are the Z-axis direction, the upper part is the rear, and the lower part is the front. In the figure: the double dotted line with arrows indicates the air flow; the thin solid line with the right arrow indicates the optical path. The detection module 3 includes: an optical scattering cavity 31 and a light generating part 32 . The optical scattering cavity 31 is a sealed cavity structure. The optical scattering cavity 31 is provided with an augmenting lens 325 , a pair of second diaphragms 326 and an optical trap 327 arranged in a line along the X-axis direction. Both sides of the second apertur...

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Abstract

The present invention provides a light-scattering-method-based PM2.5 monitor calibration method and device, and relates to the measuring technology. A light scattering signal generated by an aerosol particle group is converted into an electrical signal; total aerosol particle mass can be obtained according to direct proportion relation of cumulative voltage and cumulative mass of the aerosol particle group; a sample volume of a to-be-tested PM2.5 monitor is used as a standard volume, and standard mass concentration can be obtained according to the ratio of the total aerosol particle mass and the standard volume; an error value of a concentration display value of the to-be-tested PM2.5 monitor and the standard mass concentration is read by comparison, and a test result is judged. The light-scattering-method-based PM2.5 monitor calibration method solves the technical problems of complex calibration process, low calibration efficiency, difficulty in trace to the source of quality benchmark technology of PM2.5 monitors in the prior art. The beneficial effects are as follows: fast measuring speed, high sensitivity and accurate detection. Operation is simple and time saving, detection efficiency is improved, the light-scattering-method-based PM2.5 monitor calibration method is capable of tracing to the source of quality benchmark, can achieve online calibration, and saves testing costs, and the calibration device is reasonable in structure, low in cost, and easy to maintain.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a method and device for calibrating the concentration of a PM2.5 monitor. Background technique [0002] Particulate matter (particulate matter) PM2.5 refers to the particulate matter with an aerodynamic equivalent diameter of ≤2.5 μm in the ambient air, also known as fine particulate matter. PM2.5 in the air will cause great harm to human health through the lower respiratory tract. In addition, PM2.5 is also one of the important causes of atmospheric haze. When the mass concentration of PM2.5 exceeds 75 μg / m3, visibility will decrease and haze will appear, affecting normal traffic and life. At present, the construction of automatic air quality monitoring stations and the procurement of PM2.5 monitoring equipment are being carried out all over the country, and some areas have begun to publish the daily average value of PM2.5. my country has not issued corresponding standards for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/075
Inventor 李国水陈哲敏张建锋
Owner ZHEJIANG MEASUREMENT SCI RES INST
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