Optoelectric distance measuring apparatus with delay and zero cr

Details Optoelectric distance measuring apparatus with delay and zero cr Optoelectric distance measuring apparatus with delay and zero cr

1988-08-05

1989-07-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, G01N 2186

Patent

active

048496448

ABSTRACT:
A distance measuring apparatus based on a time-of-flight measurement of a light pulse is provided. The apparatus includes a light pulse transmitter having a diode laser and a light pulse receiver having a photodiode. Connected to the photodiode is a pulse amplifier and a pulse detector. The pulse detector includes a delay line connected to the pulse amplifier and having a short-circuited end, a threshold valve and zero crossing detector connected to the delay line at a predetermined distance from its short-circuited end, and a timer circuit. The delay line conducts an electrical pulse from the pulse amplifier to its short-circuited end where the pulse is reflected and inverted. The threshold value and zero crossing detector determines when a combination of the electrical pulse and its inverted copy crosses a threshold value and a zero value.

REFERENCES:
patent: 4139301 (1979-02-01), Chaborski
patent: 4181431 (1980-01-01), Chaborski
patent: 4344705 (1982-08-01), Kompa et al.
patent: 4521107 (1985-06-01), Chaborski et al.
patent: 4553836 (1985-11-01), Meier et al.
patent: 4699508 (1987-10-01), Bolkow et al.
patent: 4734587 (1988-03-01), Schwarte
"New Simple Circuits to Eliminate Time Slewing", Review of Scientific Instruments, vol. 45, No. 10, Oct. 1974, pp. 1235-1238.

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