Monitoring system for a predetermined field of view

Details Monitoring system for a predetermined field of view Monitoring system for a predetermined field of view

1981-12-15

1985-11-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Interference pattern analysis

250221, 350451, G02B 1318, G08B 1318

Patent

active

045544590

ABSTRACT:
A lift control system includes a spatial filter for producing a signal having various features, a discriminator for discriminating one or more features of the signal, and for producing a control signal when at least one of the features discriminated falls in a predetermined range, and active devices connected to the discriminator. The spatial filter is defined by a semi-spherical bowl having a plurality of openings or by a poly-face prism which is made from a plano-convex lens with its curved face so polished or cut as to have a plurality of flat faces.

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