Lightspeed-related measurement apparatus

Details Lightspeed-related measurement apparatus Lightspeed-related measurement apparatus

1991-01-04

1992-11-10

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

342127, G01S 1308

Patent

active

051628627

ABSTRACT:
Time of transit of a propagated electric signal at lightspeed is used as a measure of distance from a transmitter (laser 32) to a receiver (photodetector 39) via a target (reflector 14). A continuous modulating signal of fixed frequency (10.700 MHz) is transmitted. The distance traversed is measured by a timer which compares the phase at transmission with that at reception. The invention involves a heterodyne down-conversion technique involving two crystal oscillators (30, 31), which are phase-locked to assure that one regulates the other to keep their frequencies in linear proportional relationship, both being at the transmitter location, which transfer the phase difference to a 10.45 kHz frequency, thereby facilitating high resolution and precision mesurement by extending the time measure representing distance.

REFERENCES:
patent: 4044353 (1977-08-01), Levy
patent: 4146328 (1979-03-01), Hullein et al.
patent: 4238795 (1980-12-01), Schiek et al.

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