Method of an apparatus for nondestructuve workpiece testing

Details Method of an apparatus for nondestructuve workpiece testing Method of an apparatus for nondestructuve workpiece testing

1996-12-10

1998-11-24

Westin, Edward P.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250347, 2503581, 356381, G01N 1508

Patent

active

058411380

ABSTRACT:
A nondestructive workpiece testing method and apparatus are provided, wherein an electromagnetic, intensity modulated excitation beam is directed at a point of examination on a workpiece surface, and wherein thermal radiation emitted by the point of examination is detected and evaluated, the excitation beam being guided periodically in different directions in each one of which it is directed at a different point of examination on a workpiece surface. Moreover, an apparatus is provided for nondestructive workpiece testing, comprising an excitation source for the emission of an electromagnetic excitation beam, an optical means to modulate the intensity of the excitation beam and to direct the excitation beam at a point of examination on a workpiece surface, further comprising a detector means to detect the thermal radiation emitted by the point of examination. The optical means comprises modulating means for periodically deflecting the excitation beam in different directions as well as directional means for directing the excitation beam in each direction at a different point of examination on a workpiece surface.

REFERENCES:
patent: 3569696 (1971-03-01), Karlson
S. O. Kanstad and Per-Erik Nordal, "Experimental aspects of photothermal radiometry", Can. J. Phys., vol. 64, 1986, pp. 1155-1164.
C. A. Bennett, Jr. and R. R. Patty, "Thermal wave interferometry: a potential application of the photoacoustic effect", Applied Optics, vol. 21, No. 1, Jan. 1, 1982, pp. 49-54.

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