Laser distance measuring device with phase delay measurement
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United States of America Patent
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Apr 4, 2006
Grant Date -
Jun 3, 2004
app pub date -
Aug 8, 2003
filing date -
Aug 9, 2002
priority date (Note) -
Expired
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Abstract
A laser distance measuring device (1) includes a laser diode (4) for emitting a high frequency intensity modulated measurement light beam (3) and connected with a signal generating unit (SGU) that generates a high frequency measurement signal (9) for high frequency signal transfer, at least one receiver photodetector (8a) for receiving a measurement light beam (3) reflected from a measurement object (5) and connected to a high frequency demodulator (13) for generating a low frequency phase delay signal (S1) containing phase information of the reflected intensity modulated measurement light beam (3), and a microcontroller (μC) for calculating a distance (D) from the phase delay signal (S1) and connected to the high frequency demodulator (13), with the microcontroller (μC) being connected to a control photodetector (8c) arranged in the measurement light beam (3) for low frequency transfer for determining an interference modulation component.
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