A Light Scattering Particle Counter and Its Particle Size Distribution Algorithm
A particle counter, light scattering technology, applied in particle size analysis, individual particle analysis, particle and sedimentation analysis, etc., can solve the problem of reducing the accuracy of the counter, reduce noise and background value, improve accuracy and efficiency, stray light reduced effect
Active Publication Date: 2016-06-15
CHINA JILIANG UNIV
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Problems solved by technology
In the above-mentioned patents, only the size of the particles is identified according to the amplitude of the voltage pulse signal, and the particle size distribution of the particle group is counted. The algorithm is simple, which will lead to a decrease in the accuracy of the counter.
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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0024] Such as Figures 1 to 4 The light scattering particle counter, a light scattering particle counter, includes a sensor body 1, an optical path 2, an air path 3, a photoelectric conversion module 4, a preamplifier circuit 5, a main control board 6, a display 7, and a storage module 8. The optical path includes a laser light source 21, and a collimating lens group 22, a diaphragm 23, a photosensitive area 24, and an optical trap 25 are arranged in sequence in the forward direction of the light beam emitted by the laser light source; the gas path is along the flow direction of the gas It includes an air inlet pipe 31, a photosensitive area 24, an air outlet pipe 33, and a pump 34 in sequence; the photoelectric conversion module includes a photoelectric conversion module housing 41, and the photoelectric conversion module also includes a foc...
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The invention discloses a light scattering particle counter, which includes a sensor body, an optical path, a gas path, a photoelectric conversion module, and a preamplifier circuit. Lens group, diaphragm, photosensitive area, light trap; the gas path includes the air inlet pipe, photosensitive area, air outlet pipe and pump in sequence along the gas flow direction; multiple filters in a certain spatial position are arranged in the light trap, and the filter There are N pieces in total, and the N is an integer greater than 0. Among the filters, the n-1th filter and the n-1th light beam form an acute angle, and the n-1th filter absorbs part and then guides the remaining The next part of the nth light beam strikes the nth filter at an acute angle, where n is an integer ranging from 2 to N in sequence. Due to the improvement of the light trap, the beam of the laser light source passing through the diaphragm is absorbed with great efficiency, so that the stray light in the photosensitive area of the sensor body is greatly reduced, and the accuracy and reliability of counting are improved.
Description
technical field [0001] The invention relates to a light-scattering particle counter and an algorithm thereof, in particular to a light-scattering particle counter for measuring particle size distribution in clean air and a particle size distribution algorithm thereof. Background technique [0002] At present, the technical scheme of the existing light-scattering particle counter, such as the invention patent of CN101162195A owned by Suzhou Huada Instrument Equipment Co., Ltd.--"Dust Particle Counter and Its Application Method" and the medical equipment of the Academy of Military Medical Sciences of the Chinese People's Liberation Army The research institute has an invention patent with the publication number CN101639435A - "Particle Counter", which is mainly as follows: The photoelectric sensor for measuring dust particles is usually composed of an illumination system, a scattered light collection system, a photoelectric converter, and an air circuit system. Among them, the i...
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IPC IPC(8): G01N15/14G01N15/02
Inventor 陈红岩宋熠金沈红源
Owner CHINA JILIANG UNIV