TITLE

A phase-shift laser scanner based on a time-counting method for high linearity performance

AUTHOR(S)
Yoon, Heesun; Song, Hajun; Park, Kyihwan
PUB. DATE
July 2011
SOURCE
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p075108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In the phase-shift measurement method, the distance light travels can be obtained via the phase difference between the reference and the measured signals. In this paper, a multiple-step phase demodulation method with time counting is proposed for measuring the phase difference, with resulting robustness against electric noise. When the phase differences are close to 2nπ (n = 0, 1, 2, ...), 2π ambiguity problems commonly occur; here, a time-counting method using a 180°-shifted reference signal is proposed in order to resolve this problem.
ACCESSION #
63502330

 

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