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Laser signal real-time continuous extracting method for atmospheric suspended particle

A laser signal and atmospheric particle technology, applied in the analysis of materials, scattering characteristics measurement, instruments, etc., can solve the problems of not fine detection interval, different experimental results, inaccurate measurement data, etc., and achieve the effect of advanced functions

Inactive Publication Date: 2008-12-31
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Using this method is not conducive to continuous data sampling. Since the cut-off diameter of each stage of the multi-stage impactor is related to the gas mass flow rate during work, the experimental results of vacuum pumps with different pumping speeds are different.
The later measurement data will be very inaccurate, the detection interval is not fine, and the measurement results cannot be monitored and observed in real time.

Method used

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  • Laser signal real-time continuous extracting method for atmospheric suspended particle
  • Laser signal real-time continuous extracting method for atmospheric suspended particle
  • Laser signal real-time continuous extracting method for atmospheric suspended particle

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Embodiment Construction

[0029] See attached picture.

[0030] The present invention involves three aspects: 1. Sample injection and flow system, absorbing aerosol samples to generate collimated particle flow; 2. Optical measurement system, forming a focused spot suitable for particle size and measurement; 3. Electrical signal processing system , Processing photoelectric signal, airflow control circuit.

[0031] The main technical indicators of the present invention are as follows: 1. The range of measuring particle size: 0.5 to 10 microns. 2. Particle types: solid and non-volatile liquid particles. 3. Maximum particle concentration: 0.5 micron: the particle overlap rate is less than 10% at a concentration of 1500 / cm3; 10.0 micron: the particle overlap rate is less than 10% at a concentration of 600 / cm3. 4. Flow rate: aerosol sample: 1.0±0.2L / Min, shell flow: 4.0±0.1L / Min, total airflow: 5.0±0.1L / Min. 6. Flow control: The built-in brushless DC pump is controlled by the feedback of total flow and sh...

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Abstract

Red semiconductor diode laser in 650- 675nm wavelength as scattered light source for aerosol particles passing through collimating lens, adjustment of activizer, cylindrical lens A and B forms horizontal, prolated facula on focal plane. Two beam: o light and e light with equal energy are obtained after light passes through yttrium vanadate crystal positioned behind cylindrical lens B. aerosol particles in atmosphere passes through two faculas formed by o light and e light one by one, generating scattered light, which collected by a half ellipsoid mirror forms two strong scattering peaks. Avalanche photodiode transfers received signal to electric system. The invention detects particle distribution in diameter of 0.5-10micros in aerodynamics and content of particles possessing biology characteristic.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a signal collection method for suspended particles in the atmosphere. Background technique [0002] In places where the environment is polluted, what people breathe is not pure air but aerosol, which has an important impact on people's life and health. Atmospheric aerosols (Aerosols) refer to solid or liquid particles suspended in the atmosphere. Some phenomena that are usually seen, such as: dust, smoke, smoke, fog, haze, etc., all belong to the category of aerosols. The harmfulness of aerosol to the human body mainly depends on its composition, concentration, source and particle size. Aerosol particle sizes range from 0.001 to 100 μm. The properties of aerosol particles of different sizes are often very different. For example, the floating life of coarse particles with large diameters in the atmosphere is very short, about a few hours, while the lifespan of fine parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/53G01N15/00
Inventor 连悦刘文清刘建国黄书华张天舒董凤忠陆钒
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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