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Development of an automatic routine for calibration of thermographic phosphors

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Author

Summary, in English

An automated routine for the continuous calibration of thermographic phosphors was developed as a replacement for the conventional calibration scheme that relied on fixed temperature points. The automated calibration routine was validated using Mg 3 F 2 GeO 4 :Mn as a calibration phosphor. Hardware and software aspects of the calibration process were addressed in this development. The hardware aspect included a new substrate design using a high performance alloy, the Hastelloy-C alloy, whereas the software aspect included an automated acquisition system which was capable of acquiring simultaneous thermocouple temperatures and phosphor decay waveform in real time. The design of the calibration process eliminates the need for a system in thermal equilibrium during a phosphor calibration measurement. Temperature ramping rates of up to 4 K min −1 were employed in the oven without a delay in the temperature response being measured between the phosphor and the thermocouples involved. In addition, the automated calibration setup allowed for detailed investigations on the effect of heat being delivered to the phosphor coating by the laser. These findings were confirmed by a simple heat transfer model, based on lumped system analysis. In comparison to the data acquisition performed at several fixed points with the conventional calibration scheme, the experiment duration was shortened by a factor of 4 with the overall accuracy improved by 1–2 K.

Department/s

Publishing year

2014

Language

English

Publication/Series

Measurement Science & Technology

Volume

25

Issue

2

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • laser induced phosphorescence
  • calibration
  • thermometry
  • thermographic phosphors

Status

Published

ISBN/ISSN/Other

  • ISSN: 0957-0233