Calibration procedure for focal plane array cameras and noise equivalent material loss for quantitative thermographic NDT

Journal Article · Sat Mar 01 00:00:00 EST 1997 · Materials Evaluation

OSTI ID:471095

Marinetti, S; Maldague, X ^[1]; Prystay, M ^[2]

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1. Univ. Laval, Quebec City, Quebec (Canada). Electrical and Computer Engineering Dept.
2. National Research Council of Canada, Boucherville, Quebec (Canada)

In this paper, a complete procedure is proposed for the calibration of a focal plane array in quantitative infrared nondestructive testing (NDT). This procedure includes vignetting correction and gray level conversion into temperature. A noise analysis is also presented in the context of pulsed infrared thermography applied to NDT. In this analysis, the authors introduce a new parameter, the noise equivalent material loss (NEML). The NEML is a global figure of merit which allows the comparison of different experimental set-ups for infrared pulsed thermography. Theory, experimental validation of the proposed concepts, and comparison with a few infrared scanning thermal imagers are presented as well.

• OSTI ID: 471095
• Journal Information: Materials Evaluation, Vol. 55, Issue 3; Other Information: PBD: Mar 1997
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
INFRARED THERMOGRAPHY
NONDESTRUCTIVE TESTING
CALIBRATION
CAMERAS
CORROSION
DEFECTS