Light detecting apparatus having low noise automatic gain contro

Details Light detecting apparatus having low noise automatic gain contro Light detecting apparatus having low noise automatic gain contro

1994-08-25

1995-11-28

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214AG, 327187, H01J 4014

Patent

active

054710499

ABSTRACT:
A laser light detector is provided which can be used to detect pulsed laser light that is produced by a rotating laser light source on a construction job site. The laser light detector provides an easily-read display which is indicative of the present level or elevation of the laser light detector with respect to the plane of rotating laser light. The laser light detector has a very large dynamic range, while maintaining a very good signal-to-noise ratio, and can, therefore, be used at both short and long distances from the rotating laser light source. The laser light detector is not dependent upon the energy level received of laser light, or by the spot size of laser light as it reaches the light detectors. Multiple discrete steps of elevation indication are provided, which can easily be increased to a larger number of discrete steps, if so desired. The laser light detector is available with several options, including dead band adjustment, normal or offset on-grade displaying, and averaging.

REFERENCES:
patent: 3812386 (1974-05-01), Porter
patent: 4851660 (1989-07-01), Juds et al.
patent: 4884939 (1989-12-01), Nielsen
patent: 5004339 (1991-04-01), Pryor et al.
patent: 5189484 (1993-02-01), Koschmann et al.

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