Distance measuring apparatus with phase detection
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United States of America Patent
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Jan 19, 1993
Grant Date -
N/A
app pub date -
Jan 22, 1991
filing date -
Jan 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A distance measuring apparatus has a photoelectric light transmitter (11) and a photoelectric light receiver (12) which alternately direct light via a measurement path (14) and a reference path (15) to a single photoreceiver (20). The distance from a target (13) is determined by measurement of the transit time differences via the measurement path (14), on the one hand, and via the reference path (15), on the other hand. The light transmitter (11) contains two laser diodes (18, 19) which can be electronically switched in a complementary manner of which the one sends the light trains to the measurement path (14) and the other sends light trains to the reference path (15). Both light wave trains are alternately received by the same photoreceiver (20) which is connected to an electronic processing circuit.
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