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 ...
0 IntroductionThe cavity ring-down(CRD)technique has been successfully used for measurement of absorption[1]and highreflectivity[2].In this technique,a ring-down cavity(RDC),one kind of passive resonator,is built first.Then a laserpulse or continuous wave
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