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Improvement of the contrast-to-noise ratio in pulse-phase thermography by frequency dependent windowing

: Netzelmann, Udo; Müller, David

Fulltext (PDF; )

Maldague, X.P.V.:
QIRT 2020, 15th Quantitative InfraRed Thermography Conference. Online resource : Porto (Portugal), 21-30 September 2020, virtual conference
Online im WWW, 2020
ISSN: 2371-4085
Paper QIRT-2020-016, 10 pp.
Quantitative InfraRed Thermography Conference (QIRT) <15, 2020, Online>
Conference Paper, Electronic Publication
Fraunhofer IZFP ()
pulsed phase thermography; Contrast-to-noise ratio; Pulse phase thermography

Two modified algorithms for pulsed phase thermography were defined. The principle is to mask out parts of the thermal signal that only add noise but no significant information. The algorithms were tested on synthetic signals from a circular hidden defect and experimentally by flash excited thermography on a steel and a polymer sample. A significant improvement of the contrast-to-noise ratio of defects was obtained for higher analysis frequencies.