Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1979-09-26
1981-06-23
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
343 7A, 343 12R, G01C 308
Patent
active
042747368
ABSTRACT:
With an electrooptical distance meter a reference signal is timeshifted by means of an electronic phase shifter (20), until it has a given phase relation to the measurement signal. Both signals are compared in phase by a double balanced mixer (22), the output of which directs the electronic phase shifter (20) by a control loop (20, 22, 23). The phase shift is measured after frequency conversion by two additional double balanced mixers (24, 25). Thus handy precision distance meters with measurement frequencies about 500 MHz may be built, comprising control loops for laser diode transmitter (1), avalanche diode receiver (13), phase shifter (20) and intermediate frequency, as well as a processor (5, 29) control for automatic function of the instrument.
REFERENCES:
patent: 3508828 (1970-04-01), Froome et al.
patent: 3577144 (1971-05-01), Girault
patent: 3832056 (1974-08-01), Shipp et al.
patent: 4077718 (1978-03-01), Graham, Jr. et al.
patent: 4093380 (1978-06-01), White
A. W. Kondraschkow, "Electrooptical Dist. Meas." (German), Berlin, 1961, Veb Verlag fur Bauwesen, p. 169; 356-5.
Buczinski Stephen C.
Kern & Co. AG
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