title: A phase-shift laser scanner based on a time-counting method for high linearity performance.
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.
authors.affiliation: Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Republic of Korea.
authors.forename: Heesun
authors.initials: H
authors.lastname: Yoon
authors.forename: Hajun
authors.initials: H
authors.lastname: Song
authors.forename: Kyihwan
authors.initials: K
authors.lastname: Park