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Uncertainty Analysis Method for Measuring Particulate Concentration in Air Based on Automatic Weighing of Filter Membrane

A technology of particle concentration and standard uncertainty, which is applied in particle suspension analysis, measuring devices, suspension and porous material analysis, etc., can solve problems such as inability to realize automation, improve repeatability and measurement accuracy, reduce volatilization, The effect of avoiding the influence of measurement results

Active Publication Date: 2021-06-15
HENAN PROVINCE INST OF METROLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem that the present invention aims at is: adopt filter membrane weighing method to measure the PM in the air in the prior art 2.5 When the concentration is high, the measurement process is affected by factors such as external temperature and humidity, and human factors, and automatic and batch detection cannot be realized; there is no measurement of PM in the air by the filter weighing method in the prior art. 2.5 Uncertain analysis of concentration, unable to effectively reduce PM 2.5 Factors affecting concentration measurement and improving the accuracy of measurement results

Method used

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  • Uncertainty Analysis Method for Measuring Particulate Concentration in Air Based on Automatic Weighing of Filter Membrane
  • Uncertainty Analysis Method for Measuring Particulate Concentration in Air Based on Automatic Weighing of Filter Membrane
  • Uncertainty Analysis Method for Measuring Particulate Concentration in Air Based on Automatic Weighing of Filter Membrane

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Embodiment 1

[0105] The invention provides a particulate matter sampling and weighing device, see Figure 1-Figure 6 , the device includes a box body 100, a membrane disc 200, a gas collection unit 300, a weighing unit 400, and a transfer unit 500. In this embodiment, the box body 100 is a constant temperature and humidity box body. Specifically, it can be purified by setting an air filter device Filter the air in the box, set up an air circulation system, so that the temperature and humidity in the entire box can be evenly distributed, and set up a constant temperature unit and a constant humidity unit to heat or cool the air, humidify or dehumidify the air; further in the box 100 A support plate 101 made of marble is provided in the middle of the structure, and various components are arranged on the support plate 101 .

[0106] Specifically, the transfer unit 500 in this embodiment includes a guide seat 501, a vertical rod 503 matched in the guide seat, a lower bracket 502 arranged at th...

Embodiment 2

[0119]This embodiment adopts the device and system described in Embodiment 1 to detect PM in the air 2.5 The concentration of particulate matter is detected, and the specific process is as follows:

[0120] S1. Using the device and system described in Embodiment 1 to detect the PM in the unit volume of the gas to be measured 2.5 The concentration of particulate matter (1) is first detected by using this device to detect PM 2.5 Concentration indication error of particle concentration

[0121] According to the measurement range of the instrument, select three concentration measurement points. With a calibrated standard PM 2.5 The measuring instrument and the sampling system of the present invention sample at the same time, and each measurement point is repeatedly operated 3 times, and 3 values ​​of the detection concentration of the standard device are respectively taken Arithmetic mean ρ of 1 3 numerical values ​​related to the detection concentration of this sampling sys...

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Abstract

The invention discloses an uncertainty analysis method for measuring the concentration of particulate matter in the air based on automatic weighing of a filter membrane. The present invention first adopts the described automatic weighing measurement system to be detected PM in the air 2.5 The concentration of particulate matter is detected, and then a mathematical model is established according to the detection results; then the source of uncertainty is analyzed according to the established mathematical model and the uncertainty components are measured; then the relative standard uncertainty and the relative expanded uncertainty are synthesized in turn . The measurement process of this system is controlled by computer without manual intervention, real-time display of concentration values, generation of various charts, and long-term storage. The present invention evaluates the uncertainty of the detection process on the basis of stored data, and comprehensively analyzes the uncertainty components introduced by systematic errors and random errors in the uncertainty evaluation, and finally obtains accurate and credible uncertain data . It provides a reliable method basis for online measurement.

Description

technical field [0001] The invention belongs to the technical field of air quality detection. Specifically, it relates to an uncertainty analysis method for measuring the concentration of particulate matter in the air based on automatic weighing of a filter membrane. Background technique [0002] With the development of my country's economy, air pollution is becoming more and more serious. The content of dust particles and harmful gases in the air is gradually increasing. Among them, respirable dust PM 10 , fine dust PM 2.5 After being inhaled, it will accumulate in the respiratory system and cause many diseases. Coarse particles can damage the respiratory system and induce asthma. Fine particulate matter may cause heart disease, lung disease, respiratory disease, and reduce lung function. The finer the particles, the more harmful they are to the human body, and they can even enter the alveoli and blood, which can be life-threatening in severe cases. PM 2.5 It also h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06
Inventor 樊玮邹君臣朱永宏王广俊闫继伟师恩洁路兴杰郝霞莉刘文思王琳
Owner HENAN PROVINCE INST OF METROLOGY