Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-09-27
1992-05-05
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
374 5, 250341, G01N 2171
Patent
active
051110482
ABSTRACT:
A method and apparatus for detecting a defect in a workpiece are disclosed. The workpiece is positioned with a surface of the workpiece to be inspected in an optical path of an infrared radiation detector. A selected portion of the workpiece is heated by scanning with electromagnetic radiation for a selected duration to cause an increase in radiance from any defect present in the selected portion. Any defects, present in the workpiece selected portion, which may cause a failure of the workpiece, may be detected and distinguished from minor surface anomalies by analyzing a transient response of the irradiance received by the infrared radiation detector.
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Thermal & Infrared Nondestructive Testing of Composites and Ceramics Donald R. Green Materials Evaluation vol. 29, No. 11 (Nov. 1971) pp. 241-247.
Bantel Thomas E.
Devitt John W.
Kania Janet S.
Sparks Joseph M.
Beyer James E.
Fields Carolyn E.
General Electric Company
Moore, Jr. Charles L.
Squillaro Jerome C.
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