Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1976-04-27

1978-01-17

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 12R, G01C 308

Patent

active

040689514

ABSTRACT:
A distance measuring apparatus comprises a first modulating cavity for modulating a first electromagnetic carrier radiation, the modulated first electromagnetic carrier radiation being transmitted over a path the length of which is to be measured and received by a second modulating cavity which determines the modulation phase thereof. The second modulating cavity also modulates a second electromagnetic carrier radiation in accordance with the modulation phase of the received modulated first electromagnetic carrier radiation and transmits the modulated second electromagnetic carrier radiation back over the path the length of which is to be measured. The first modulating cavity detects the modulation phase of the received modulated second electromagnetic carrier radiation and produces therefrom an indication of the length of the path.

REFERENCES:
patent: 3305861 (1967-02-01), Webb
patent: 3521956 (1970-07-01), Froome et al.
patent: 3547539 (1970-12-01), Froome et al.
patent: 3573463 (1971-04-01), Goodwin et al.
patent: 3600090 (1971-08-01), Wood et al.
patent: 3701151 (1972-10-01), Sato et al.

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