Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1997-05-15

1998-12-22

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

342135, 327 72, G01C 308, G01S 1308

Patent

active

058524916

ABSTRACT:
A distance measuring apparatus measures the time an emitted optical pulse requires to go and return the distance to a target before being received by using the emission time and the reception time of the optical pulse, and obtains the distance to the target from the measured time. A converter converts an optical pulse received by a photodetector into an electrical signal. A divider divides the electrical signal pulse into two signal pulses. A delay element delays only one signal pulse. Both the undelayed and delayed pulses are applied to a threshold generator. The threshold generator generates and holds the value of signal intensity at the intersection of waveforms of the two pulses as a threshold value of the received signal pulse. A comparator generates a digital signal pulse indicating the reception time from the received signal pulse by using the generated threshold value.

REFERENCES:
patent: 3763436 (1973-10-01), Haw
patent: 5523835 (1996-06-01), Tanaka
patent: 5726742 (1998-03-01), Nourrcier

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