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Proceedings Paper

Application of pulse cavity ring-down spectroscopy technique for aerosol extinction measurement
Author(s): Jie Guo; Jindong Xiang; Liming Wang; Jie Shao; Qingying Zheng; Zhen Zhou
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Paper Abstract

In recent years, there has been a rapid rise in the use of pulse cavity ring-down spectroscopy to determine the optical properties of atmospheric aerosols. In the present work ,we describes the design and performance of a CRDS system for measuring extinction coefficients of atmospheric aerosols. CRDS based methods can achieve impressive sensitivity owing to the long effective path lengths involved. More importantly, the method is not affected by laser intensity fluctuations since the rate of attenuation of light is the measured variable rather than absolute irradiance. The extinction coefficient is a function of the cavity ring-down time. Determining an accurate decay time is critical to precise measurements of the extinction coefficients. The average and standard deviation of the decay time (τ0 is measured 6 hours ,cavity filled only with dry nitrogen) is about 42.21μs and 0.16μs, respectively. Moreover, a minimum detectable aerosol extinction coefficient of 0.41Mm-1 is achieved. Allan deviation plots for the value of τ0 measurements, close to a flicker noise. The minima(~5.8x10-4μs) in the Allan plots indicate the optimum average time(~60s) for optimum detection performance. To test the performance of the CRDS system, we monitored the optical properties of ambient aerosols on the campus of the Zhejiang Normal University from January 3rd to January 7th, 2014. During this period, the average value of the extinction coefficient is 816.8Mm-1, a maximum value more than 1800 Mm-1, and a minimum aerosol extinction coefficient of 119.27 Mm-1 is detected.

Paper Details

Date Published: 19 November 2014
PDF: 7 pages
Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92741S (19 November 2014);
Show Author Affiliations
Jie Guo, Zhejiang Normal Univ. (China)
Jindong Xiang, Zhejiang Normal Univ. (China)
Liming Wang, Zhejiang Normal Univ. (China)
Jie Shao, Zhejiang Normal Univ. (China)
Qingying Zheng, Kunshan Hexin Mass Spectrometry Technology Co., Ltd. (China)
Zhen Zhou, Kunshan Hexin Mass Spectrometry Technology Co., Ltd. (China)

Published in SPIE Proceedings Vol. 9274:
Advanced Sensor Systems and Applications VI
Tiegen Liu; Shibin Jiang; Niels Neumann, Editor(s)

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