Range imaging laser radar

Details Range imaging laser radar Range imaging laser radar

1989-08-14

1990-06-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 5, H01J 3150

Patent

active

049356160

ABSTRACT:
A laser source is operated continuously and modulated periodically (typicy sinusoidally). A receiver imposes another periodic modulation on the received optical signal, the modulated signal being detected by an array of detectors of the integrating type. Range to the target determined by measuring the phase shift of the intensity modulation on the received optical beam relative to a reference. The receiver comprises a photoemitter for converting the reflected, periodically modulated, return beam to an accordingly modulated electron stream. The electron stream is modulated by a local demodulation signal source and subsequently converted back to a photon stream by a detector. A charge coupled device (CCD) array then averages and samples the photon stream to provide an electrical signal in accordance with the photon stream.

REFERENCES:
patent: 3495087 (1970-02-01), Storer
patent: 3733129 (1973-05-01), Bridges
patent: 3761614 (1973-09-01), Bradley
patent: 3866052 (1975-02-01), Di Matteo et al.
patent: 4199253 (1980-04-01), Ross
patent: 4259017 (1981-03-01), Ross et al.

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