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Proceedings Paper

Impacts of PM concentrations on visibility impairment
Author(s): Guo Jie; Mei-mei Wang; Ye-Xing Han; Zhi-Wei Yu; Huai-Wu Tang
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Paper Abstract

In the paper, an accurate and sensitive cavity attenuated phase shift spectroscopy (CAPS) sensor was used to monitor the atmospheric visibility. The CAPS system mainly includes a LED light source, a band-pass filter, an optical resonant cavity (composed of two high mirror, reflectivity is greater than 99.99%), a photoelectric detector and a lock-in amplifier. The 2L/min flow rate, the optical sensor rise and fall response time is about 15 s, so as to realize the fast measurement of visibility. An Allan variance analysis was carried out evaluating the optical system stability (and hence the maximum averaging time for the minimum detection limit) of the CAPS system. The minima (~0.1 Mm-1) in the Allan plots show the optimum average time (~100s) for optimum detection performance of the CAPS system. During this period, the extinction coefficient was correlated with PM2.5 mass (0.88), the extinction coefficient was correlated with PM10 mass (0.85). The atmospheric visibility was correlated with PM2.5 mass (0.74). The atmospheric visibility was correlated with PM10 mass (0.66).

Paper Details

Date Published: 4 November 2016
PDF: 7 pages
Proc. SPIE 10026, Real-time Photonic Measurements, Data Management, and Processing II, 100261C (4 November 2016); doi: 10.1117/12.2247767
Show Author Affiliations
Guo Jie, Hangzhou Zetian Technology Co., Ltd. (China)
Mei-mei Wang, Hangzhou Zetian Technology Co., Ltd. (China)
Ye-Xing Han, Hangzhou Zetian Technology Co., Ltd. (China)
Zhi-Wei Yu, Hangzhou Zetian Technology Co., Ltd. (China)
Huai-Wu Tang, Hangzhou Zetian Technology Co., Ltd. (China)


Published in SPIE Proceedings Vol. 10026:
Real-time Photonic Measurements, Data Management, and Processing II
Ming Li; Bahram Jalali; Keisuke Goda; Kevin K. Tsia, Editor(s)

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