Method and apparatus for balancing out disturbances in distance

Details Method and apparatus for balancing out disturbances in distance Method and apparatus for balancing out disturbances in distance

1978-05-19

1980-10-21

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 12R, 343 14, G01C 308

Patent

active

042291020

ABSTRACT:
A method and apparatus are provided for balancing out interference caused by stray coupling between the internal circuits of a distance measuring apparatus of the phase-type in a simple manner which produces a substantial increase of the usable measuring range. At least two groups of mutually separate distance measurements are performed, with each group including at least one measurement operation. For each pair of groups of distance measurements, one measuring group is effected with the transmitter signal in a first phase and the other measuring group is effected with the transmitter unit of the transmitter section supplied with a transmitter signal in a second phase which is displaced substantially 180.degree. relative to the first phase. The mean value or the mean values of the measuring results in each measurement group are thereafter formed, with this calculation being made either by hand or automatically. Preferably, the invention includes a controllable phase shifter to provide the phase shift of the measurement signals supplied to the transmitter.

REFERENCES:
patent: 2982167 (1961-05-01), Friden et al.
patent: 3619058 (1971-11-01), Hewlett
patent: 3634860 (1972-01-01), Rittenbach
patent: 3723002 (1973-03-01), Everest et al.
patent: 3740141 (1973-06-01), Dewitt, Jr.
patent: 3874296 (1975-04-01), Hedemark
patent: 4025193 (1977-05-01), Pond et al.

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