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Real-time online measurement system and method of particle size and chemical components of atmospheric particulate

A technology for atmospheric particulate matter and chemical composition, which is applied in particle and sedimentation analysis, individual particle analysis, measurement devices, etc. and chemical composition information

Active Publication Date: 2015-06-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, the light scattering technology still has the following problems and deficiencies in the online monitoring of atmospheric particulate matter: (1) The light scattering technology realizes the measurement of the particle size and number concentration of atmospheric particulate matter, and it is difficult to obtain information such as the chemical composition of atmospheric particulate matter; (2) The existing light scattering particle size measurement results are easily affected by parameters such as particle refractive index and particle shape, which reduces the accuracy of particle size measurement; (3) It is difficult to obtain the particle size and chemical composition of a single particle at the same time points information

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  • Real-time online measurement system and method of particle size and chemical components of atmospheric particulate
  • Real-time online measurement system and method of particle size and chemical components of atmospheric particulate
  • Real-time online measurement system and method of particle size and chemical components of atmospheric particulate

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Embodiment Construction

[0035] Such as figure 1 As shown, the measurement system of the present invention includes: a laser 1, a collimating lens 2, an aperture 3, a first detector 4, a second detector 5, a third detector 6, a fourth detector 7, an optical trap 8, Signal processing circuit 9, computer 10. Among them, the laser 1 is a 650nm, 30mW semiconductor laser; the optical trap 8 is a Brewster optical trap; the detector is a high-sensitivity avalanche photodiode; the collimator lens 2 is an aspheric collimator lens that matches the divergence angle of the laser 1; The optical trap 8 should achieve an absorption efficiency of the outgoing laser light greater than 0.99, so as to avoid interference of stray light on the signal measurement results of each detector. Sampling particulate matter 11 should ensure that a single laser beam passes through, so as to avoid real-time measurement and analysis of individual atmospheric particulate matter information.

[0036] The laser light emitted by the la...

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Abstract

The invention relates to a real-time online measurement system and method of the particle size and the chemical components of atmospheric particulate. The device consists of a laser, photoelectric detectors and a signal processing circuit, wherein the particle size and the chemical components of a single-particulate matter can be measured on line at same time by signals through the single laser and the four detectors. The method is simple to implement, does not need film sampling and off-line analysis, and effectively expands the real-time online sensing method of multiple physical and chemical parameters of the atmospheric particulate based on a light scattering principle.

Description

technical field [0001] The invention relates to a real-time on-line measurement system and method for the particle size and chemical composition of atmospheric particles, and is especially suitable for rapid non-contact measurement of microphysical and chemical parameters of atmospheric particles. Background technique [0002] With the rapid growth of my country's economy and the continuous acceleration of urbanization, atmospheric particulate matter is currently the primary pollutant in most cities in my country, and haze pollution is showing a significant upward trend. At present, the air pollution of my country's urban agglomerations is a special type of combined atmospheric pollution in which coal smoke and motor vehicle exhaust pollution coexist. Concentrations of atmospheric particulate matter make the atmosphere cloudy and reduce visibility. "Not seeing the blue sky" has become a common worry in many cities. Air pollution also poses new threats to human health, and the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/10G01N21/47
Inventor 桂华侨李德平程寅王杰王焕钦余同柱刘建国陆亦怀鲁岸立张礁石黄书华伍德侠
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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