Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-12-17
1992-10-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356431, G01N 2188
Patent
active
051553716
ABSTRACT:
A device for detecting deformations in the surface of a workpiece includes a light source for illuminating the surface of the workpiece; a detector situated at a fixed predetermined distance from the light source and a displacing arrangement for effecting a relative movement between the workpiece and the light source. The detector comprises a photoreceiver for receiving reflected light from the workpiece and for generating a first output signal having a frequency dependent from the deformation of the workpiece. The photoreceiver is position-sensitive perpendicularly to a direction of the relative movement. A frequency analyzer is operatively connected to the receiver for receiving the first output signal from the photoreceiver and for generating a second output signal when the frequency of the first output signal exceeds a cutoff frequency. There is further provided a deformation indicator operatively connected to the frequency analyzer for receiving the second output signal therefrom and for indicating a deformation in the surface of a workpiece when the second output signal is received.
REFERENCES:
patent: 4092068 (1978-05-01), Lucas et al.
patent: 4376583 (1983-03-01), Alford et al.
patent: 4849645 (1989-07-01), Mendenko et al.
Burggraf Hubert
Krupka Rene
Rathjen Dirk
Krupp Atlas Elektronik GmbH
Nelms David C.
Shami K.
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