High-accuracy absolute distance measurement by two-wavelength double heterodyne interferometry with variable synthetic wavelengths
Abstract
We present an absolute distance measurement interferometer based on a two wavelength interferometer and a variable synthetic wavelength technique. The wavelength scanning range was 12 GHz, realized with a phase accuracy of 1.0 m{\lambda} by heterodyne detection at each measurement wavelength. This small wavelength scanning range enabled the use of distributed feedback laser diodes as an interferometer light source and a fast 20 ms wavelength scanning time by injection current control. We demonstrated a measurement range of up to 1.5 m and an accuracy better than 1.2 nm in comparison with a displacement measurement interferometer, corresponding to a relative accuracy of 10-9. In addition, we also proposed expanding the range of maximum measurement and compensation of refractive index of air for linear colliders.
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Cite
@article{arxiv.1402.5575,
title = {High-accuracy absolute distance measurement by two-wavelength double heterodyne interferometry with variable synthetic wavelengths},
author = {Yoshiyuki Kuramoto and Hiroshi Okuda},
journal= {arXiv preprint arXiv:1402.5575},
year = {2014}
}
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7 pages