Laser-based coordinate measuring device and laser-based method for measuring coordinates
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United States of America Patent
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Jun 5, 2018
Issued Date -
Jan 26, 2017
app pub date -
Oct 6, 2016
filing date -
Jul 23, 1999
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Abstract
A method for measuring a distance includes modulating the light beam at a first frequency, receiving a second beam by the optical detector to produce a first electrical signal having the first frequency and a first phase; modulating the light beam at a second frequency different than the first frequency; receiving the second beam by the optical detector to produce a second electrical signal having the second frequency and a second. After these steps, the retroreflector is moved while modulating the light beam continuously at the second frequency; and a first distance to the retroreflector is determined based at least in part on a the first and second frequencies and phases.
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