Pulse delay measuring circuit

Details Pulse delay measuring circuit Pulse delay measuring circuit

1990-11-06

1992-04-07

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

342 91, 342135, 367 98, 375 94, 375 99, G01C 308, G01S 1308, G01S 1500, H03D 100

Patent

active

051022206

ABSTRACT:
A method of measuring a distance to an object includes generating first signal pulses to be bounced off the object and receiving the first signal pulses, after the first signal pulses have been bounced off the object, as second signal pulses. When the amplitude of the second signal pulses is above a predetermined value, the second signal pulses are differentiated and then supplied as differentiated second signal pulses to an input of an analog-to-digital converter. When the amplitude of the second signal pulses is not above the predetermined value, the second signal pulses are passed through to the input of the analog-to-digital converter unchanged. Signal pulses at the input to the analog-to-digital converter are converted into digital signals. The digital signals are summed over a period of time to generate a sum. The sum is used to determine the time delay between generating the first signal pulses and receiving the second signal pulses. The time delay is proportional to the distance to the object.

REFERENCES:
patent: 3164661 (1965-01-01), Dellon
patent: 3503680 (1970-03-01), Schenkerman
patent: 3954335 (1976-05-01), Bodlaj

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