Method and a device for photothermally testing workpieces

Details Method and a device for photothermally testing workpieces Method and a device for photothermally testing workpieces

1996-07-02

1998-06-02

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503417, 2503418, G01N 2171, G01N 2101

Patent

active

057604002

ABSTRACT:
A method for photothermally testing workpieces, which includes the steps of directing an electromagnetic excitation beam to a desired measuring point on the workpiece surface, detecting and evaluating the heat in the form of thermal radiation which is generated by the excitation beam at the measuring point with the aid of a measuring head; directing two visible locating beams to the workpiece surface, the two locating beams intersecting at a point of intersection; and correcting the relative position between the workpiece and the measuring head so that the point of intersection and the desired measuring point coincide on the workpiece surface.

REFERENCES:
patent: 2659824 (1953-11-01), Burnham
"Thermal Wave Interferometry", C.A. Bennett, Jr. and R.R. Patty, Applied Optics, vol. 21 No. 1, Jan., 1982, pp. 49 to 54.

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