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Study on Atmospheric Turbidity Measurement Methods and the Design of Its Device

Author: WangKun
Tutor: XiaoShaoRong
School: Nanjing University of Information Engineering
Course: Signal and Information Processing
Keywords: Scattering Turbidity Detect MSP430
CLC: X851
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
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Abstract


In recent years, due to the sustained and rapid development of the industry , air pollution is more and more serious , often air turbid aerosol is caused by one of the main reasons of atmospheric turbidity . In order to meet the needs of the people of the high standards of living environment , atmospheric environment detection technology is growing , many countries have made ??a lot of research on aerosol turbidity testing atmospheric photoelectric monitoring technology is one of the most active research direction . The detection method for the mainstream , the papers on the basis of extensive research study and explore using a single light source , dual detector , the four optical path measurement technology . As the light passes through the aerosol absorption and scattering , the light intensity changes , the thesis by periodic measurement of the dual detector 90 . The scattered light and transmitted light is strong, the experiments prove that the system can eliminate the impact of aging since the light source different from the instability and detector sensitivity , system errors can be reduced . The paper carried out in-depth study of aerosol scattering and transmission theory , based on the detection system hardware circuit design . MSP430 - based control chip , take advantage of its rich resources , the help of a small amount of external components , to achieve real-time detection of aerosol turbidity change . The modulated optical signal , and the receiving end in the detection of the signal amplification and filtering , to achieve effective elimination of the influence of the environmental interference signals on the measurement results by the pulse signal is applied to the laser tube . The system is simple , compact structure , high long-term reliability .

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring equipment > Atmospheric monitoring equipment
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