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Updated: Jul 6, 2026
11:34
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
Surface temperature-field imaging with laser-induced thermographic phosphorescence
A C Edge1, G Laufer, R H Krauss
1Aerospace Research Laboratory, University of Virginia, 570 Edgemont Road, Charlottesville, Virginia 22903, USA.
Applied Optics
|March 14, 2008
Summary
This study enhances thermographic phosphor (TP) technology for high-temperature imaging of metallic surfaces up to 1300 K. The improved technique offers accurate remote temperature measurements with minimal uncertainty.
Area of Science:
- Materials Science
- Optical Engineering
- Thermodynamics
Background:
- Remote temperature measurement of heated metallic surfaces is crucial for industrial applications.
- Existing thermographic phosphor (TP) techniques have limitations at higher temperatures.
Purpose of the Study:
- To extend the Dy(+3):YAG thermographic phosphor (TP) technique for higher temperature imaging.
- To assess the performance and accuracy of TP at elevated temperatures.
Main Methods:
- Utilized a Dy(+3):YAG thermographic phosphor (TP) bonded to metallic surfaces.
- Excited the TP using 355 nm radiation and recorded emission from two excited states.
- Normalized digital emission images to correct for illumination and coating variations.
Main Results:
- The TP material demonstrated survival through heating and cooling cycles up to 1400 K.
- Temperatures ranging from 300 K to 1300 K were accurately determined.
- Achieved uncertainties of +/-7-13% at 20 microm and +/-0.7-4% at 500 microm spatial resolution.
Conclusions:
- The extended TP technique provides reliable remote temperature imaging for heated metallic surfaces.
- The method is suitable for applications requiring high-temperature measurements with good spatial resolution.
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