Distance measurement and ranging instrument having a light emitt

Details Distance measurement and ranging instrument having a light emitt Distance measurement and ranging instrument having a light emitt

1997-07-31

1999-03-30

Felber, Joseph L.

Optics: measuring and testing

Range or remote distance finding

With photodetection

327514, G01C 308

Patent

active

058895833

ABSTRACT:
A circuit and apparatus for generating a light pulse from an inexpensive light-emitting diode (LED) for an accurate distance measurement and ranging instrument comprises an LED and a firing circuit. An optional pre-biasing circuit provides a reverse-bias signal to the LED to ensure the LED does not begin to emit light before a firing circuit can provide a sufficiently high current pulse of short duration as a forward current through the LED. The LED is driven by the firing circuit with a pulse of high peak power and short duration. The resulting light pulse from the LED can be inexpensively used to derive distance and ranging information for use in a distance measurement and ranging device.

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HP Infrared Discrete Emitters, Website http://hpcc998.external.hp.com:80/HP-COMP/ir/discrete.sub.-- index.html.

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