Method and apparatus for examining sheet material

Details Method and apparatus for examining sheet material Method and apparatus for examining sheet material

1975-12-15

1977-10-18

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250563, 356200, G01N 2116, G01N 2118, G01N 2130, G01N 2132

Patent

active

040543773

ABSTRACT:
Method and apparatus for examining sheet material to detect faults therein in which the surface of the sheet material is scanned by a moving beam of electromagnetic radiation which raditation is thereafter directed to a photoelectric cell to produce therefrom a wideband electric signal comprising both high and low frequency components in which the said wideband signal is electronically processed to provide a quotient signal corresponding to the high frequency component divided by the low frequency component and applying said quotient signal to an amplitude discriminator the output of which indicates the presence of a fault in the sheet material by generation a signal of digital form in response to a disturbance in the wideband signal exceeding in amplitude a given proportion of the amplitude of said low frequency component.

REFERENCES:
patent: 3496365 (1970-02-01), Mounce
patent: 3565536 (1971-02-01), Wuellner et al.

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