Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1980-03-07
1982-08-17
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
307246, 343 13R, 372 81, G01C 308, G01S 1310
Patent
active
043447058
ABSTRACT:
Distance measuring apparatus based on the pulse travel time method comprising a light pulse generator for generating periodic light pulses, a transmitting optical system for transmitting the light pulses, a receiving optical system for receiving the echo pulses produced by reflection of the light pulses at a target object, a photoelectric transducer for converting each echo pulse to an electrical measuring pulse, means for generating electrical reference pulses in predetermined time relationship to the transmitted light pulses, a time transformation stage operating by the sampling method and comprising a sampling pulse generator for generating periodic sampling pulses whose period is slightly different to the period of the transmitted light pulses, a first sampling circuit receiving the sampling pulses and the reference pulses and producing time-transformed reference pulses by periodically sampling a large number of successive reference pulses by means of the sampling pulses, and a second sampling circuit receiving the sampling pulses and the measuring pulses and producing time-transformed measuring pulses by periodically sampling a large number of successive measuring pulses by means of the sampling pulses, the second sampling circuit being directly connected to the output of the photoelectric transducer to receive the measuring pulses without intervening amplification, and time measuring means for measuring the time interval between corresponding edges of each time-transformed reference pulse and an associated time-transformed measuring pulse.
REFERENCES:
patent: 3305862 (1967-02-01), Samuel et al.
patent: 3601488 (1971-08-01), Ripart
patent: 3723002 (1973-03-01), Everest et al.
patent: 3900261 (1975-08-01), Wingate
patent: 3951549 (1976-04-01), Fowler et al.
patent: 4125835 (1978-11-01), Barry
Kompa Gunter
Stock Don J. R.
Baker Joseph J.
Buczinski S. C.
Endress u. Hauser GmbH u. Co.
Ferguson Jr. Gerald J.
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