Internal temperature monitor for work pieces

Details Internal temperature monitor for work pieces Internal temperature monitor for work pieces

1992-05-27

1993-07-13

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

By a vibratory effect

374117, 73643, G01K 1124, G01K 1122

Patent

active

052267300

ABSTRACT:
A method and apparatus for measuring the internal temperature of a work piece comprises an excitation laser for generating laser pulses which are directed through a water cooled probe, and in an optical fiber, to a first surface of the work piece. The laser is of sufficient intensity to ablate the surface of the work piece, producing a displacement and a resulting ultrasonic pulse which propagates within the thickness of the work piece to an opposite surface. The ultrasonic pulse is reflected from the opposite surface and returns to the first surface to create a second displacement. A second continuous laser also shines its light through an optical fiber in the probe into the first surface and is used in conjunction with signal processing equipment to measure the time between the first and second displacements. This time is proportional to the time-of-flight of the ultrasonic pulse in the work piece which, with a known or detected thickness of the work piece, can be used to calculate the internal temperature of the work piece.

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