Optical test apparatus for examining an object

Details Optical test apparatus for examining an object Optical test apparatus for examining an object

1982-02-09

1984-06-19

Sikes, William L.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250563, 250572, 250237G, 356239, G01N 2100

Patent

active

044550863

ABSTRACT:
Test apparatus and method for testing for faults in, for example, transparent sheet material in which two parallel beams of light separated by a distance "w" are passed through a grating having, for example, light transmitting and absorbing areas separated by a distance "w", so that as the two beams are scanned across the object and the grating the light output through the grating is generally constant. If, however, there are faults which displace one beam with respect to the other, then the spacing between the beams will change so the light output will vary from the norm. Furthermore, if there is a fault which would cause attenuation of the two beams, then the light output will again vary from the norm.

REFERENCES:
patent: 2867149 (1959-01-01), Goddard
patent: 3185022 (1965-05-01), Holeman
patent: 3788750 (1974-01-01), Maltby, Jr. et al.
Sira, "Lasers in the Glass Industry", Glass, vol. 51, No. 9, pp. 309-312, Sep. 1974.

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