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《Opto-Electronic Engineering》 2016-11
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Signal Smoothing for Accurate Extraction of Low Signal-to-noise Ratio Cavity Ring-down Signal

HE Xing;LUAN Yinsen;DONG Lizhi;YANG Ping;XU Bing;TANG Guomao;Institute of Optics and Electronics, Chinese Academy of Sciences;Key Laboratory on Adaptive Optics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
In cavity ring-down technique, a signal smoothing method based on spatial filters which have been used in digital image processing is presented for accurate cavity decay time extraction of low signal-to-noise ratio decay signal. Its smoothing procedure was derived and its smoothing efficiency was compared with other smoothing methods. Derivation showed the mean value spatial filter had the highest smoothing efficiency. The application of decay signal smoothing was also analyzed. The combination of the mean value spatial filter with the weighted least square methods was recommended when processing low signal-to-noise ratio decay signals. This method was tested in experiment and achieved almost the same results with the Levenberg-Marquardt algorithm.
【Key Words】: cavity ring-down decay time extraction signal smoothing
【Fund】: 四川省杰出青年基金资助项目(2012JQ0012);; 国家重点科研装备开发项目资助(ZDYZ2013-2)
【CateGory Index】: TP391.41
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