Distance measuring device and method
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United States of America Patent
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-
Sep 13, 1983
Grant Date -
N/A
app pub date -
Oct 23, 1980
filing date -
Oct 23, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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