Laser curtain having an array of parabolic mirrors each focusing

Details Laser curtain having an array of parabolic mirrors each focusing Laser curtain having an array of parabolic mirrors each focusing

1987-06-12

1989-08-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356386, G01N 2186, G01V 904

Patent

active

048556084

ABSTRACT:
A laser beam fanned into a triangular plane configuration by mirrors, succeeding additional mirrors focusing the laser curtain rays back onto a spot, the spot having a light detecting, electrical transmitting element such that a square wave pulse is generated as the laser timely sweeps the collecting mirror, a breach in the square wave occurring when the laser ray curtain is penetrated breaking a laser beam, thus said penetration being detected, a system of three laser curtains in X, Y, and Z coordinates, having means of traversing an object to be measured, determining the exterior of each of its six sides.

REFERENCES:
patent: 3484615 (1969-12-01), Novo et al.
patent: 3744915 (1973-07-01), Sick
patent: 3997269 (1976-12-01), Moulton
patent: 4351437 (1982-09-01), Long
patent: 4402609 (1983-09-01), Fetzer et al.
patent: 4432648 (1984-02-01), Musto et al.
patent: 4555633 (1985-11-01), Bjovkelund

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