Detector device for a rotating light beam

Details Detector device for a rotating light beam Detector device for a rotating light beam

1985-08-05

1987-06-30

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356152, 33293, G01C 308

Patent

active

046766340

ABSTRACT:
A detector device for a rotating light beam, which beam defines a reference plane, includes a pair of adjacent detector elements which provide detection signals when illuminated by the beam. If the beam is above or below a first reference band, the detection signals differ sufficiently in amplitude to actuate a comparator. An averaging circuit determines if the beam is above or below the first reference band during a certain number of a set of immediately preceding rotations of the beam, and appropriate visual and audible indication are produced. The device may also provide an indication that the beam is above or below a second reference band which is aligned with, but wider than, the first reference band. The widths of the reference bands may be adjusted.

REFERENCES:
patent: 3711716 (1973-01-01), Koyano et al.
patent: 3767923 (1973-10-01), Bardwell
patent: 4023908 (1977-05-01), Johnson et al.
patent: 4030832 (1977-06-01), Rando et al.
patent: 4062634 (1977-12-01), Rando et al.
patent: 4200787 (1980-04-01), Carson
patent: 4240208 (1980-12-01), Pehrson

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