Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1996-08-23
1998-08-04
Felber, Joseph L.
Optics: measuring and testing
Range or remote distance finding
With photodetection
327314, 327325, 250214R, G01C 308
Patent
active
057902445
ABSTRACT:
A pre-biasing technique for a transistor-based avalanche circuit which improves the initial rate of rise in the current applied through a laser diode or other light emitting device in a laser based distance measurement and ranging instrument and, therefore, the sharpness of the leading edge of the laser pulse produced. Since the timing of the flight time of a laser pulse to a target and back to the ranging instrument is determined with reference to the leading edge of the emitted laser pulse, the inherent precision obtainable is enhanced by the production of a sharper leading edge pulse. Through the use of the pre-biasing technique disclosed, the very rapid rise time pulse which may be achieved also allows for the substitution of a much cheaper light emitting diode in lieu of a conventional laser diode in an alternative implementation of a light pulsed-based distance measuring and ranging instrument.
REFERENCES:
patent: 5548112 (1996-08-01), Nakase et al.
patent: 5578815 (1996-11-01), Nakase et al.
patent: 5652651 (1997-07-01), Dunne
Felber Joseph L.
Kubida William J.
Laser Technology, Inc.
Pinto James A.
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