| 摘要 |
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 (122) 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. The use of the pre-biasing technique disclosed also allows for the substitution of a much cheaper light emitting diode (122) in lieu of a conventional laser diode in an alternative implementation of a light pulsed-based distance measuring and ranging instrument.
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