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A Two-mode Interference Measurement for Nanometer Accuracy Absolute Distance Ranging

Abstract : We present a laser ranging system, under development, that uses a high frequency modulated beam to achieve sub-nm resolution by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular we show that the signal, which presents both optical and synthetic wavelength scales, is essential to achieve nm-scale accuracy, despite the significant long-term phase drifts in the 20 GHz detection chains. Then we present results obtained with the telemeter implemented on an optical table, for a distance of about four meters, implemented by folding the laser beam path to the target. The challenge here is to achieve a phase and amplitude measurement of two 20 GHz signals with a resolution well below 10-4 cycle and 10-4, respectively, despite the fact that the signal undergoes very strong (×3 ) amplitude changes.
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Contributor : Michel Lintz <>
Submitted on : Thursday, December 5, 2013 - 3:50:12 PM
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  • HAL Id : hal-00914565, version 1


Michel Lintz, Ha Phung, Alain Brillet, Christophe Alexandre. A Two-mode Interference Measurement for Nanometer Accuracy Absolute Distance Ranging. International Conference on Space Optics - ICSO, Oct 2012, Ajaccio, France. ⟨hal-00914565⟩



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