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High-concentration particle counting method by using space division and time correlation

A time-correlated and particle counting technology, which is applied in the analysis of materials, individual particle analysis, particle and sedimentation analysis, etc., can solve the problems of counting accuracy drop, signal overlap, pulse superposition, etc., and achieve counting error reduction and missed detection probability. Effect

Active Publication Date: 2020-01-10
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When using traditional detectors to collect signals, when the concentration of the gas to be measured is too high, signal overlap and pulse overlap will occur, resulting in a decrease in the final counting accuracy, and the counting error of each particle size file is also high, which cannot meet the national regulations. "JJF 1190-2008 Calibration Specifications for Dust Particle Counters" standard

Method used

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  • High-concentration particle counting method by using space division and time correlation
  • High-concentration particle counting method by using space division and time correlation
  • High-concentration particle counting method by using space division and time correlation

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Embodiment

[0036] Such as figure 1 As shown, the schematic diagram of the working principle of the high-concentration particle counter with space division and time correlation, its structure includes a laser source 1, an aspheric mirror 2, a spherical mirror 3, a photosensitive area 4, an optical trap 5, a spatial array structure detector 6, and a front Amplifier 7, time-correlated comparison circuit 8 and gas path system 9, etc. The direction of the optical path, the direction of the gas path, and the direction in which the detector collects optical signals are perpendicular to each other, and a cuboid sensor is placed at the intersection of the three paths for interaction. The laser light emitted by the laser source passes through the aspheric mirror to form a photosensitive area. The particles to be measured enter the photosensitive area at a uniform speed through the air pump system and then scatter light. Amplify small signals. The particle signals collected under normal condition...

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Abstract

The invention discloses a high-concentration particle counting method by using space division and time correlation. The method comprises the steps of: enabling a plurality of detectors to work at thesame time, and enabling optical signals generated by particles in different spaces to be collected by different detectors to greatly reduce the problems of missed measurement and wrong measurement during counting; and connecting a signal comparison circuit for screening and discriminating, wherein signals completely consistent with those entering and leaving a photosensitive area in time are generated by the same particle, particle signals with different amplitudes in the same time period are subjected to signal screening, small-amplitude signals generated by noise are filtered out, and only the signal with the highest amplitude is reserved as a real scattered light signal reflecting the particle. According to the counting method, the counting error is greatly reduced, and the particle size resolution and the counting efficiency are improved.

Description

technical field [0001] The invention relates to the field of particle counting, in particular to a high-concentration particle counting method using space division and time correlation. Background technique [0002] At present, there are more and more industries in my country that have requirements for air cleanliness, and the requirements are getting higher and higher. Automobile exhaust, industrial waste gas, etc. have seriously affected human health, industrial production and atmospheric climate. Effective monitoring of gas indicators and Standardized control is imminent, and these need to be monitored by high-concentration particle counters. The market demand for them is increasing and the prospects are broad. [0003] In a traditional particle counter, the particles to be measured enter the concentrating cavity through the sampling airflow, and the particles are scattered under the illumination beam. The scattered light signal is collected by the concentrating cavity, an...

Claims

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Application Information

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IPC IPC(8): G01N15/14
CPCG01N15/1429G01N15/1434G01N15/1456G01N2015/1493G01N2015/1486Y02A90/10
Inventor 王春勇陈旭豪李振华来建成纪运景严伟
Owner NANJING UNIV OF SCI & TECH
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