Laser transmitter incorporating target dither

Details Laser transmitter incorporating target dither Laser transmitter incorporating target dither

1997-04-11

1999-11-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250235, 250236, 359196, G02B 2608

Patent

active

059775343

ABSTRACT:
A laser beam transmitting system is provided comprising at least one target, a laser detection module, an optical system, a rotary encoder, a dither zone memory, and a controller. The optical system is arranged to generate a reference laser beam selectively in one of a search mode and a target dither mode and to direct a laser beam reflected from the target to the laser detection module. The search mode is characterized by movement of the reference beam through a rotational arc defined about a central rotational axis and the target dither mode is characterized by movement of the reference beam through a selected discrete portion of the rotational arc. The rotary encoder is arranged to produce a rotary signal indicative of a rotary position of the reference beam relative to the rotational arc. The controller is programmed to identify a position of the at least one target based upon the reflected laser beam signal and the rotary signal, establish a dither zone associated with the target position, store data indicative of the established dither zone in the dither zone memory, establish a dither time associated with the dither zone, and cause the optical system to operate in the target dither mode wherein the reference beam moves within the dither zone for an amount of time equal to the dither time.

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"MinuteMarker General Construction/Interior Laser System Model 1462" Brochure, Published Oct. 26, 1996.

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