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25 October 2016 Measuring atmospheric visibility cavity attenuated phase shift spectroscopy
Guo Jie, Shan-Shan Ye, Xiao Yang, Ye-Xing Han, Huai-Wu Tang, Zhi-Wei Yu
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Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 101561B (2016) https://doi.org/10.1117/12.2246856
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
In the paper, an accurate and sensitive cavity attenuated phase shift spectroscopy (CAPS) system was used to monitor the atmospheric visibility coefficient in urban areas. The CAPS system, which detects the atmospheric visibility within a 10 nm bandpass centered at 532 nm, comprises a green LED with center wavelength in 532nm, a resonant optical cavity (36 cm length), a Photo Multiplier Tube detector and a lock in amplifier. The performance of the CAPS system was evaluated by measuring of the stability and response of the system. The minima (~0.06 Mm-1) in the Allan plots show the optimum average time(~80s) for optimum detection performance of the CAPS system. The 2L/min flow rate, the CAPS system rise and fall response time is about 15 s, so as to realize the fast measurement of visibility. By comparing the forward scatter visibility meter measurement results, the CAPS system measurement results are verified reliably, and have high precision measurement. These figures indicate that this method has the potential to become one of the most sensitive on-line analytical techniques for atmospheric visibility detection.
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Guo Jie, Shan-Shan Ye, Xiao Yang, Ye-Xing Han, Huai-Wu Tang, and Zhi-Wei Yu "Measuring atmospheric visibility cavity attenuated phase shift spectroscopy", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561B (25 October 2016); https://doi.org/10.1117/12.2246856
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KEYWORDS
Spectroscopy
Atmospheric particles
Phase shifts
Visibility
Aerosols
Mass attenuation coefficient
Spectroscopic atmospheric monitoring techniques
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