Enhanced color ratio calibration approach for two-dimensional surface thermometry using laser-induced phosphorescence
Knappe, Christoph LU ; Lindén, Johannes LU
; Richter, Mattias
LU
and Aldén, Marcus
LU
(2013)
In Measurement Science & Technology
24(8).
- Abstract
- An alternative concept for calibrating spectral image intensity ratios is described, which provides simple, but effective means of compensation for systematic errors, caused by nonlinearities in signal detection. The method relies on image segmentation by means of
signal thresholds, where pixels are organized into different subgroups according to their corresponding signal count value. Instead of defining one global spectral ratio per calibration
temperature, the phosphor-coated target surface is illuminated inhomogeneously and resulting image ratios are calibrated individually for each pixel intensity subgroup. This allows the
exploitation of high intensity regions on the camera chip which offer great precision... (More) - An alternative concept for calibrating spectral image intensity ratios is described, which provides simple, but effective means of compensation for systematic errors, caused by nonlinearities in signal detection. The method relies on image segmentation by means of
signal thresholds, where pixels are organized into different subgroups according to their corresponding signal count value. Instead of defining one global spectral ratio per calibration
temperature, the phosphor-coated target surface is illuminated inhomogeneously and resulting image ratios are calibrated individually for each pixel intensity subgroup. This allows the
exploitation of high intensity regions on the camera chip which offer great precision advantages, but suffer from systematic errors caused by signal nonlinearities. Temperature calibration data of BaMg2Al16O27:Eu in the temperature range between 270 and 470 K was
used to assess and compare the potential of both calibration approaches. In comparison to the conventional, e.g. global calibration approach, accuracy improvements of up to 39% were
gained even while keeping average signal intensities below 15% of the detector’s full dynamic range. Image ratio evaluations, based on segregated pixel subgroups, could help improve measurement accuracy also for other techniques, relying on the calibration of measured
quantities. In two-dimensional phosphor thermometry, it helps bridge the current precision gap between two-color ratio methods and more elaborate lifetime-imaging approaches. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4022183
- author
- Knappe, Christoph
LU
; Lindén, Johannes
LU
; Richter, Mattias
LU
and Aldén, Marcus
LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- laser-induced phosphorescence, thermographic phosphors, thermometry, ICCD detectors, BAM
- in
- Measurement Science & Technology
- volume
- 24
- issue
- 8
- article number
- 085202
- publisher
- IOP Publishing
- external identifiers
-
- wos:000321943100022
- scopus:84880774868
- ISSN
- 0957-0233
- DOI
- 10.1088/0957-0233/24/8/085202
- language
- English
- LU publication?
- yes
- id
- d7609b61-0e08-4fce-be60-e833c1a59ab3 (old id 4022183)
- alternative location
- http://iopscience.iop.org/0957-0233/24/8/085202
- date added to LUP
- 2016-04-01 14:09:42
- date last changed
- 2022-01-27 23:06:45
@article{d7609b61-0e08-4fce-be60-e833c1a59ab3,
abstract = {{An alternative concept for calibrating spectral image intensity ratios is described, which provides simple, but effective means of compensation for systematic errors, caused by nonlinearities in signal detection. The method relies on image segmentation by means of<br/><br>
signal thresholds, where pixels are organized into different subgroups according to their corresponding signal count value. Instead of defining one global spectral ratio per calibration<br/><br>
temperature, the phosphor-coated target surface is illuminated inhomogeneously and resulting image ratios are calibrated individually for each pixel intensity subgroup. This allows the<br/><br>
exploitation of high intensity regions on the camera chip which offer great precision advantages, but suffer from systematic errors caused by signal nonlinearities. Temperature calibration data of BaMg2Al16O27:Eu in the temperature range between 270 and 470 K was<br/><br>
used to assess and compare the potential of both calibration approaches. In comparison to the conventional, e.g. global calibration approach, accuracy improvements of up to 39% were<br/><br>
gained even while keeping average signal intensities below 15% of the detector’s full dynamic range. Image ratio evaluations, based on segregated pixel subgroups, could help improve measurement accuracy also for other techniques, relying on the calibration of measured<br/><br>
quantities. In two-dimensional phosphor thermometry, it helps bridge the current precision gap between two-color ratio methods and more elaborate lifetime-imaging approaches.}},
author = {{Knappe, Christoph and Lindén, Johannes and Richter, Mattias and Aldén, Marcus}},
issn = {{0957-0233}},
keywords = {{laser-induced phosphorescence; thermographic phosphors; thermometry; ICCD detectors; BAM}},
language = {{eng}},
number = {{8}},
publisher = {{IOP Publishing}},
series = {{Measurement Science & Technology}},
title = {{Enhanced color ratio calibration approach for two-dimensional surface thermometry using laser-induced phosphorescence}},
url = {{http://dx.doi.org/10.1088/0957-0233/24/8/085202}},
doi = {{10.1088/0957-0233/24/8/085202}},
volume = {{24}},
year = {{2013}},
}