Signal processing method for in-situ, scanned-beam particle monitoring
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United States of America Patent
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Jun 14, 2005
Grant Date -
Apr 24, 2003
app pub date -
Sep 9, 2002
filing date -
Sep 7, 2001
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Abstract
A novel method for analyzing the pulse train resulting from a scanned beam particle monitor is described. The method enhances signal-to-noise ratio and significantly reduces particle false alarm rate. Performed in the time domain, the method filters noise pulses that do not occur at the scanner frequency. The analysis further identifies particle-pulse-envelopes (PPE's) by performing a forward-looking and backward-looking autocorrelation. Gaussian fits are subsequently applied to identified particle-pulse envelopes, to determine particle characteristics, such as size and speed.
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