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Development of an automatic routine for calibration of thermographic phosphors

Abou Nada, Fahd Jouda LU ; Knappe, Christoph LU ; Xu, Xin; Richter, Mattias LU and Aldén, Marcus LU (2014) In Measurement Science & Technology 25(2).
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
laser induced phosphorescence, calibration, thermometry, thermographic phosphors
in
Measurement Science & Technology
volume
25
issue
2
publisher
IOP Publishing
external identifiers
  • wos:000332697800018
  • scopus:84892933069
ISSN
0957-0233
DOI
10.1088/0957-0233/25/2/025201
language
English
LU publication?
yes
id
025afb8c-65e4-4432-aa62-add46fd083a2 (old id 4251100)
date added to LUP
2014-01-22 21:50:38
date last changed
2017-01-01 06:15:33
@article{025afb8c-65e4-4432-aa62-add46fd083a2,
  abstract     = {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.},
  articleno    = {025201},
  author       = {Abou Nada, Fahd Jouda and Knappe, Christoph and Xu, Xin and Richter, Mattias and Aldén, Marcus},
  issn         = {0957-0233},
  keyword      = {laser induced phosphorescence,calibration,thermometry,thermographic phosphors},
  language     = {eng},
  number       = {2},
  publisher    = {IOP Publishing},
  series       = {Measurement Science & Technology},
  title        = {Development of an automatic routine for calibration of thermographic phosphors},
  url          = {http://dx.doi.org/10.1088/0957-0233/25/2/025201},
  volume       = {25},
  year         = {2014},
}