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

Abstract

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.

Inventors:
 [1]
  1. 1300 Mills St., Menlo Park, CA 94025
Publication Date:
Research Org.:
X-RAY INSTRUMENTATION ASSOC
OSTI Identifier:
871673
Patent Number(s):
US 5774522
Assignee:
Warburton, William K. (1300 Mills St., Menlo Park, CA 94025)
DOE Contract Number:  
FG03-92ER81311
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; digitally; based; speed; x-ray; spectrometer; direct; coupled; continuous; discharge; preamplifiers; signal; processing; accepts; directly; input; data; detector; type; preamplifier; produces; spectral; analysis; x-rays; illuminating; principal; elements; analog; conditioning; section; combinatorial; logic; implements; digital; triangular; filtering; pileup; inspection; microprocessor; values; captured; compute; energy; operating; pole-zero; correction; achieves; resolution; capturing; conjunction; peak; value; filter; associated; unfiltered; latter; correct; former; errors; arise; local; slope; terms; greatly; reduces; degradation; centroid; shifting; output; spectrum; function; count; rate; noise; excessive; modification; allows; filtered; averages; corrected; amplitude; computed; therefrom; x-ray spectrometer; energy resolution; digitally based; greatly reduces; output spectrum; direct coupled; spectral analysis; signal processing; analog signal; x-ray energy; peak value; count rate; input data; signal conditioning; speed x-ray; peak amplitude; energy values; directly coupled; filtered signal; signal process; combinatorial logic; greatly reduce; x-rays illuminating; discharge type; /378/250/

Citation Formats

Warburton, William K. Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers. United States: N. p., 1998. Web.
Warburton, William K. Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers. United States.
Warburton, William K. Thu . "Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers". United States. https://www.osti.gov/servlets/purl/871673.
@article{osti_871673,
title = {Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers},
author = {Warburton, William K},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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