Spurious electromagnetic energy discriminator for electro-optica

Details Spurious electromagnetic energy discriminator for electro-optica Spurious electromagnetic energy discriminator for electro-optica

1986-08-21

1988-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356381, G01N 2186

Patent

active

047711825

ABSTRACT:
An electro-optical system for inspecting an object includes a source producing a beam of electromagnetic energy, for example, a laser. It also includes a means for discriminating between electromagnetic energy of the beam scattered from objects within a predetermined distance of a plane intersected by the beam of electromagnetic energy and electromagnetic energy not so scattered. Thus, spurious electromagnetic energy scatteed by other objects near the inspected object are ignored.

REFERENCES:
patent: 3994589 (1976-11-01), Nodwell et al.
patent: 4074104 (1978-02-01), Fulkerson
patent: 4204772 (1980-05-01), Balasubramanian
patent: 4326804 (1982-04-01), Mossey
patent: 4630927 (1986-12-01), Fulkerson

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