Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1980-10-23
1983-09-13
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
343 12R, G01C 308
Patent
active
044038577
ABSTRACT:
Electromagnetic distance measurement, preferably utilizing optical signals. Signals from a main transmitter are transmitted from a first position to a second position and returned to the first position and simultaneously from the main transmitter along a first fixed length path. Two separate receiving channels are provided to receive the two signals. The phase difference between the two received signals is determined. A further auxiliary transmitter is provided and signals are subsequently transmitted from the auxiliary transmitter along second and third fixed length paths to the first and second receiving channels respectively. The phase difference between the received second and third path signals is determined, and the difference between the two phase differences obtained. This difference is then solely dependent on the distance between the two positions and the lengths of the first, second and third paths. Further, if the third path has a length equal to the sum of the lengths of the first and second paths, then the difference is dependent only on the distance between the first and second positions. The transmitted signals are in modulated form. Also, the received signals are heterodyned with a reference signal. Phase angle perturbations due to the electrical equipment is completely eliminated.
REFERENCES:
patent: 3428815 (1969-02-01), Thompson
patent: 3619058 (1971-11-01), Hewlett et al.
Buczinski S. C.
South African Inventions Development Corporation
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