Signal processing method for in-situ, scanned-beam particle...

Details Signal processing method for in-situ, scanned-beam particle... Signal processing method for in-situ, scanned-beam particle...

2005-06-14

2005-06-14

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For size of particles

By particle light scattering

Reexamination Certificate

active

06906799

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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