Physics – Instrumentation and Detectors
Scientific paper
2006-09-21
Nucl.Instrum.Meth.A575:395-401,2007
Physics
Instrumentation and Detectors
14 pages, 5 figures, submitted to Applied Optics
Scientific paper
10.1016/j.nima.2007.02.101
In this paper, we report on new high-precision absolute distance measurements performed with frequency scanned interferometry using a pair of single-mode optical fibers. Absolute distances were determined by counting the interference fringes produced while scanning the frequencies of the two chopped lasers. High-finesse Fabry-Perot interferometers were used to determine frequency changes during scanning. Dual lasers with oppositely scanning directions, combined with a multi-distance-measurement technique previously reported, were used to cancel drift errors and to suppress vibration effects and interference fringe uncertainties. Under realistic conditions, a precision about 0.2 microns was achieved for a distance of 0.41 meters.
Riles Keith
Yang Hai-Jun
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