Method and apparatus for thermowave analysis

Details Method and apparatus for thermowave analysis Method and apparatus for thermowave analysis

1991-09-25

1993-04-27

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

356447, G01N 2117

Patent

active

052067106

ABSTRACT:
A method and apparatus for thermowave analysis employs a single laser beam, which has an additive, two-frequency, intensity modulation, and is directed onto the object. The amplitude of the mixed frequency of the discrete modulation frequencies, which is not contained in the exciting beam, is analyzed as response signal. By obtaining a reference signal from the exciting beam and forming the difference between this exciting beam and the measurement signal, noise suppression and a lowering of the limit of sensitivity are achieved in an advantageous manner.

REFERENCES:
patent: 4044257 (1977-08-01), Kreuzer
patent: 4579463 (1986-04-01), Rosencwaig et al.
patent: 4634290 (1987-01-01), Rosencwaig et al.
patent: 4636088 (1987-01-01), Rosencwaig et al.

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