Patent ID: 6522984
Filing Date: 2003-02-18
Classification: G01N,G01R

Abstract:
A method of pole-zero correction for digital radiation spectrometers, comprising the steps of:(a) setting an analog attenuator; (b) sampling and averaging a number of waveforms that contain samples representing preamplifier response before and after a pile-up free detector event and obtaining a discrete waveform therefrom; (c) correcting the averaged discrete waveform for DC offset; (d) unfolding any known responses of analog and digital networks in the signal chain; (e) selecting a portion of the discrete waveform that represents a clean preamplifier response; (f) determining if the portion is a straight line; (g) if the answer to step (f) is â€œyesâ€ , turning off the pole-zero attenuator; (h) if the answer to step (f) is â€œnoâ€ , exponentially fitting the discrete preamplifier data and determining the preamplifier time constant; and (i) setting the digital pole-zero corrector with parameters corresponding to the preamplifier time constant.