Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate

A technology for measuring atmospheric particulate matter and parameters, which is applied to measuring devices, particle and sedimentation analysis, particle suspension analysis, etc. It can solve the problems of complex detection structure and low measurement accuracy, and achieve the effect of improving sensitivity, reducing broadening effect, and being easy to adjust.

Inactive Publication Date: 2012-07-11
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for measuring multi-physical parameters of laser self-mixing atmospheric particles to solve the problems of complex detection structure and low measurement accuracy in the existing measurement technology for the microphysical characteristic parameters of atmospheric particles

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  • Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate
  • Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate
  • Laser self-mixing multi-physical parameter measurement method and device for atmospheric particulate

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Embodiment Construction

[0014] like figure 1 As shown, it includes a microchip laser 1 and a collimating lens 2 and a first converging lens 4 installed on the axis of its emitting end in sequence, and a device capable of emitting the microchip laser 1 is installed between the collimating lens 2 and the first converging lens 4. Light splitting is in the beam splitter 3 in the vertical direction of the emission optical axis. After the beam splitter 3 splits light, a second converging lens 5 is installed on the laser light path, and a photodetector 6 is installed at the focal point of the second converging lens 5. After the photodetector 6, the Electrically connected with signal amplifier 7, data acquisition card 8, spectrum analyzer 9 and computer, the output end of photodetector 6 is electrically connected with the input end of signal amplifier 7, and the output end of signal amplifier 7 is electrically connected with data acquisition card 8 respectively The input end of the spectrum analyzer 9 and th...

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Abstract

The invention discloses a laser self-mixing multi-physical parameter measurement method and a laser self-mixing multi-physical parameter measurement device for an atmospheric particulate. The laser self-mixing multi-physical parameter measurement device comprises a microchip laser, a collimating lens, a beam splitter, converging lenses, a photodetector, an amplifier, a data acquisition card and a spectrum analyzer. Laser emitted by the microchip laser is focused onto the atmospheric particulate to be measured through the collimating lens and the converging lens, and part of generated backwards-scattered light is fed back to the laser due to the reversibility principle of an optical path, so that parameters such as power and wavelength of the laser are changed, namely a laser self-mixing effect is achieved. In addition, the beam splitter is additionally arranged in the optical path to split a small part of laser beam for the photodetector to receive, and a laser self-mixing signal is acquired and analyzed by the amplifier, the data acquisition card and the spectrum analyzer. The laser self-mixing multi-physical parameter measurement device has a simple structure, and is easy to regulate; and the detection accuracy of an atmospheric particulate detection device is effectively improved.

Description

technical field [0001] The invention relates to the technical field of atmospheric particle monitoring, in particular to a rapid non-contact measurement method and device for multiple physical parameters of atmospheric particles. Background technique [0002] With the continuous development of the economy, particulate matter pollution has become the primary pollution source of the atmosphere. Atmospheric particulate matter concentration, particle size and movement speed, as important parameters that affect and characterize atmospheric air quality, have attracted more and more attention. Particulate matter in urban air mainly comes from soil wind and dust, industrial flue gas, construction dust, motor vehicle exhaust dust, etc., which have very serious harm to the ecological environment, industrial production, human health and other fields. Atmospheric particulate matter can absorb or reflect solar radiation, disturb the natural energy radiation balance, and reduce at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00G01N15/06G01N15/02
Inventor 桂华侨王秀利陆亦怀刘建国王杰伍德侠张静
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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