Optical radar system

Details Optical radar system Optical radar system

1985-10-25

1989-04-04

Paschall, M. H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

372 36, 357 74, 357 81, G01C 308

Patent

active

048180998

ABSTRACT:
An optical radar system comprising a transmitter (20), a receiver (22), a signal processor (200) and means (202, 206) for conveying a return signal from the receiver to the signal processor. The transmitter comprises a laser diode (50), an avalanche transistor (52), a capacitor (56) and a trigger generator (58). The laser diode, avalanche transistor and capacitor are arranged so as to minimize the combined effects of self-inductance and stray capacitance, thereby enhancing the speed and power of the optical pulses. The receiver comprises a reverse biased photodiode capacitively coupled to a dual gate GaAsFET. The transmitter and reciever are connected to the signal processor via coaxial cable (206) and cable amplifiers (202). The cable amplifiers are selected to compensate for the high frequency attenuation of the coaxial cable, such that the combined cable/cable amplifier transmission system has an essentially flat frequency response up to 1000 MHz.

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