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Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers

Patent ·
OSTI ID:871673
 [1]
  1. 1300 Mills St., Menlo Park, CA 94025
+ Show Author Affiliations

A high speed, digitally based, signal processing system which accepts directly coupled input data from a detector with a continuous discharge type preamplifier and produces a spectral analysis of the x-rays illuminating the detector. The system's principal elements are an analog signal conditioning section, a combinatorial logic section which implements digital triangular filtering and pileup inspection, and a microprocessor which accepts values captured by the logic section and uses them to compute x-ray energy values. Operating without pole-zero correction, the system achieves high resolution by capturing, in conjunction with each peak value from the digital filter, an associated value of the unfiltered signal, and using this latter signal to correct the former for errors which arise from its local slope terms. This correction greatly reduces both energy resolution degradation and peak centroid shifting in the output spectrum as a function of input count rate. When the noise of this correction is excessive, a modification allows two filtered averages of the signal to be captured and a corrected peak amplitude computed therefrom.

Research Organization:
X-RAY INSTRUMENTATION ASSOC
DOE Contract Number:
FG03-92ER81311
Assignee:
Warburton, William K. (1300 Mills St., Menlo Park, CA 94025)
Patent Number(s):
US 5774522
OSTI ID:
871673
Country of Publication:
United States
Language:
English

References (7)

Digital pulse-shape analyzer based on fast sampling of an integrated charge pulse journal January 1995
Digital techniques for real-time pulse shaping in radiation measurements
  • Jordanov, Valentin T.; Knoll, Glenn F.; Huber, Alan C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 353, Issue 1-3 https://doi.org/10.1016/0168-9002(94)91652-7
journal December 1994
A new pulse height analysis system based on fast ADC digitizing technique journal August 1993
Improving EDS Performance with Digital Pulse Processing book January 1995
Development and testing of a flash analog-to-digital converter based system for pulse shape discrimination of nuclear radiation pulses journal October 1994
X‐ray signal processing electronics for solid state detectors journal February 1995
An analog-to-digital conversion based on a moving window deconvolution journal January 1994

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