Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-10-18
1998-01-20
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25055938, 250214B, 356 503, G01C 308
Patent
active
057104247
ABSTRACT:
The present invention relates to an apparatus and a method for detecting pulses of light energy from at least two fields of view. A first detector having a first bias detects a pulse received at a first point in time. A second detector having a second bias, different from the first bias, detects a pulse received at a second point in time. A processor compares an output of the first detector with a first threshold to produce a signal representing receipt of a pulse from a first field of view. The processor also compares an output of the second detector with a second threshold, different from the first threshold, to produce a signal representing receipt of a pulse from a second field of view. Because the detectors are biased with different biases, the detected pulses are easily distinguished. Thus, multiple fields of view can be detected without complex hardware. The detectors can be biased with opposite polarities so that background noise is cancelled out. In a system and method for detecting pulses of light energy from at least two fields of view, a transmitter transmits pulses of light energy into a first field of view and into a second field of view. A single transmitter can be used to emit signals towards multiple fields of view. Thus, the transmitter only has to emit signals once for multiple samples, increasing the number of samples that can be taken per sample period.
REFERENCES:
patent: 3885872 (1975-05-01), Howe, Jr. et al.
patent: 4049961 (1977-09-01), Marcy
patent: 4333147 (1982-06-01), Regueiro et al.
patent: 4630109 (1986-12-01), Barton
patent: 4926170 (1990-05-01), Beggs et al.
patent: 5302835 (1994-04-01), Bendett et al.
patent: 5343032 (1994-08-01), Chirovsky et al.
patent: 5347456 (1994-09-01), Zhang et al.
Nati, Jr. Salvatore F.
Theodoras, II James T.
Giles Alan L.
Imra America Inc.
Westin Edward P.
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