研究目的
The parameters assessment of the differential easing method for remote measurement of the aerosol pollution disperse composition parameters in the atmospheric boundary layer under the industrial enterprise.
研究成果
The developed aerosol lidar system allows for the measurement of laser radiation weakening signals at three wavelengths, from which the average volume and superficial diameter values of aerosol particles can be derived. This method is useful for monitoring and correcting the product disperse composition and for the monitoring of dust cleaning equipment.
研究不足
The method demands the application of three lasers and is applicable in the area where the easing effectiveness factor dependence on wavelength is most strongly expressed. The method's accuracy is limited by the relative accuracy of ε=11%.
1：Experimental Design and Method Selection:
The study employed a three-wave laser system for differential easing and scattering to measure aerosol particles' size distribution.
2：Sample Selection and Data Sources:
Cement aerosol was used as the sample for experimental checking.
3：List of Experimental Equipment and Materials:
The aerosol lidar system included semiconductor lasers with 405 and 655 nm wavelengths, a YAG-Nd laser with 1064 nm wavelength, photo detectors, interference light filters, beam splitters, light fiber, rotary prism, plane glass plates, lens objective, and telescope spherical mirror.
4：Experimental Procedures and Operational Workflow:
Laser radiation at three wavelengths was directed into the atmosphere, and the scattered radiation was gathered by a telescope, focused into a light fiber, and then split into beams directed through interference filters to photo detectors.
5：Data Analysis Methods:
The differential easing method was used to determine the aerosol particles' size distribution function based on the spectral transmittance measurement for two fixed wavelengths.
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semiconductor lasers
405 and 655 nm wavelengths
Used as probing radiation sources at specific wavelengths for differential easing and scattering measurements.
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YAG-Nd laser
1064 nm wavelength
Used as a probing radiation source at a specific wavelength for differential easing and scattering measurements.
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photo detectors
Used to detect and register the scattered laser radiation.
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interference light filters
Used to filter specific wavelengths of light before detection by photo detectors.
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beam splitters
Used to split the laser beam into multiple paths for simultaneous measurement at different wavelengths.
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light fiber
Used to transmit the gathered scattered radiation to the detection system.
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rotary prism
Part of the optical layout for directing laser beams.
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plane glass plates
Used to direct part of the laser radiation to photo detectors for monitoring laser radiation power.
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lens objective
Used to focus the gathered scattered radiation into the light fiber.
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telescope spherical mirror
12 cm diameter
Used to gather the scattered laser radiation from the atmosphere.
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