Sensitive gas tube near UV photon-counting detector based on excited-state photoionization

N. S. Kopeika, J. Peleg, M. Cohen, A. Abramovitch

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Photoionization of excited states is the mechanism of detection in gas tube UV photon counting detectors of high sensitivity and variable spectral response. Because of bias to the prebreakdown region, noise current is on the order of only 10-14 A(DOT)Hz(-1/2). Spectral response varies according to gas quantum structure and pressure. High gas pressures shift spectral response to shorter wavelengths while lower pressures shift it to longer wavelengths and broaden it. One detector version is therefore almost solar blind. Another exhibits almost flat spectral response over most of the near UV band. In all cases, response falls off strongly with increasing wavelengths at longer UV wavelengths. Picowatt UV radiant powers yield about 1000 counts per minute. Response gamma is fairly constant up towards the microwatt radiant power range before falling off.

Original languageEnglish
Title of host publicationX-Ray and UV Detectors
Number of pages8
ISBN (Print)0819416029, 9780819416025
StatePublished - 1 Jan 1994

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


  • near ultra violet detectors
  • photon counting
  • solar blind
  • ultra violet detectors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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