Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test
Patent
1982-07-26
1985-06-04
Yasich, Daniel M.
Thermal measuring and testing
Leak or flaw detection
With heating or cooling of specimen for test
356 43, 356376, 356381, 374 55, 374 57, G01N 2141, G01N 2572
Patent
active
045211183
ABSTRACT:
A method for measuring thermal waves in a sample is disclosed. More particularly, thermal waves, which may be used for imaging, are generated in a sample through local periodic heating as, for example, by impinging an intensity modulated beam of energy on the surface of the sample. A laser probe is focused on a portion of the heated area on the surface of the sample in a manner such that the beam is reflected from the surface. The angular displacement of the reflected beam, resulting from the local angular change in surface conditions of the sample due to the thermal waves are monitored. By this arrangement, the displacement of the reflected beam can be used to detect the thermal waves.
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Therma-Wave, Inc.
Yasich Daniel M.
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