Light beam receiver with interference signal suppression

Details Light beam receiver with interference signal suppression Light beam receiver with interference signal suppression

2008-03-31

2010-11-23

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC

Reexamination Certificate

active

07838813

ABSTRACT:
An improved laser light beam receiver rejects unwanted pulses of optical energy, such as strobe lights or other flashes of light, that can occur on a jobsite. The receiver analyzes a light beam reception by using a photosensitive light beam detector arrangement and a separate photoelectric detector serving as an interference signal detector. This additional detector is not easily able to detect the light beams needed in normal operation. On the other hand, the additional detector does detect mostly all interfering light flashes—caused by flash lamps and other similar devices—whose threshold limit is either at the same level or below that of the light beam detector arrangement. An evaluating circuit such as a microcontroller correlates the time of reception of the light beam detector arrangement and the interference signal detector in order to discard the result if the times of reception correspond to a major extent.

REFERENCES:
patent: 5471049 (1995-11-01), Cain
patent: 6873413 (2005-03-01), Douglas
patent: 7110092 (2006-09-01), Kasper et al.
patent: 7394527 (2008-07-01), Essling et al.
patent: 2006/0082790 (2006-04-01), Zalusky
Kodenshi Corp., “Pin Photodiodes,” Aug. 2007 (2 pages).

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