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Response Regime Studies on Standard Detectors for Decay Time Determination in Phosphor Thermometry

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Author

Summary, in English

This work compares the extent of linear response regimes from standard time-resolving optical detectors for phosphor thermometry. Different types of Photomultipliers (ordinary and time-gated) as well as an Avalanche Photodiode are tested and compared using the phosphorescent time decay of CdWO4 that ranges from 10 mu s down to a few ns within a temperature span of 290 to 580 K. Effects originating from incipient detector saturation, far from obvious to the operator's eye, are revealed as a change in evaluated phosphorescence decay time. Since the decay time of thermographic phosphors itself is used for temperature determination - systematic temperature errors up to several tens of Kelvins may be introduced by such detector saturation. A detector mapping procedure is suggested in order to identify linear response regions where the decay-to-temperature evaluation can be performed unbiased. Generation of such a library is highly recommended prior to any quantitative measurement attempt. Using this detector library, even signals collected in the partly saturated regime can be corrected to their unbiased value extending the usable detector operating range significantly. Further, the use of an external current-to-voltage amplifier proved useful for most applications in time-based phosphor thermometry helping to limit saturation effects whilst maintaining a reasonable bandwidth and signal outputs.

Department/s

Publishing year

2013

Language

English

Pages

879-884

Publication/Series

Temperature: Its Measurement and Control in Science and Industry, Vol 8

Volume

1552

Document type

Conference paper

Publisher

American Institute of Physics (AIP)

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • thermographic phosphor
  • laser-induced phosphorescence
  • lifetime
  • decay
  • time
  • time-resolved
  • saturation

Conference name

9th International Temperature Symposium on Temperature - Its Measurement and Control in Science and Industry

Conference date

2012-03-19 - 2012-03-23

Status

Published

ISBN/ISSN/Other

  • ISSN: 1551-7616
  • ISSN: 0094-243X