A phase-shift laser scanner based on a time-counting method for high linearity performance
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 robust...
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| Published in | Review of scientific instruments Vol. 82; no. 7; p. 075108 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.07.2011
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| Online Access | Get more information |
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| Summary: | 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. |
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| ISSN: | 1089-7623 |
| DOI: | 10.1063/1.3600456 |