Method and apparatus for detecting thermal waves

Details Method and apparatus for detecting thermal waves Method and apparatus for detecting thermal waves

1985-11-14

1987-01-06

Yasich, Daniel M.

Thermal measuring and testing

Leak or flaw detection

With heating or cooling of specimen for test

356432, 374 57, 374121, G01N 2141, G01N 2500

Patent

active

046342907

ABSTRACT:
A method and apparatus is disclosed for detecting thermal waves. This system is based on the measurement of the change in reflectivity at the sample surface which is a function of the changing surface temperature. The apparatus includes a radiation probe beam that is directed on a portion of the area which is being periodically heated. A photodetector is aligned to sense the intensity changes in the reflected radiation probe beam which results from the periodic heating. These signals are processed to detect the presence of thermal waves.

REFERENCES:
patent: 4243327 (1981-01-01), Frosch et al.
patent: 4358201 (1982-11-01), Makosch

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