Apparatus and method for surface inspection with test and refere

Details Apparatus and method for surface inspection with test and refere Apparatus and method for surface inspection with test and refere

1988-01-27

1989-07-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356368, G02F 101, H01J 4014

Patent

active

048453560

ABSTRACT:
Apparatus for comparing a test surface 23 with a reference surface 8 comprising detector means 16.17, a test channel TC for receiving radiation from the test surface 23 and a reference channel RC for receiving radiation from the reference surface 8. A selector means 12 is provided to pass radiation from the test channel means TC and the reference channel means RC to the detector means. Varying means 5 is provided to vary the radiation passed along the test channel TC and reference channel RC. Cycle means is provided to cycle the selector means 12 between a first state in which more radiation from the test channel TC than the reference channel RC is passed to the detector means and vice versa. Control means is provided to control the radiation varying means 5 to provide a zero or minimum variation of radiation received by the detector means as the selector means 12 is cycled.

REFERENCES:
patent: 3743431 (1973-07-01), Cushing et al.
patent: 3892494 (1975-07-01), Baker et al.
patent: 4714348 (1987-12-01), Makosch

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