ABSOLUTE LENGTH-MEASURING SYSTEM BY AUTOMATIC INTERFERENCE-FRINGE-PEAK DETECTION WITH OPTICAL-COMB FIBER INTERFEROMETER

Hirokazu Matsumoto, Kiyoshi Takamasu

Abstract

Optical frequency comb has various characteristics such as short pulse, broad spectra, many spectral lines, and high temporal coherency. In this present, new absolute length-measuring technique with a high resolution of 0.1 µm is developed by using temporal-coherence interferometry of optical comb and a short translation stage for various length ranges. A new fiber Fabry-Perot etalon of a free spectral range of a frequency of 15 GHz is developed for improving the fine positioning in space. Moreover, interference-fringe-peak is automatically achieved by developing a new analog electric circuit. One position is measured round several milliseconds depending to the SN ratio of the signal detected for various ranges of the lengths measured.

Keywords

length/distance measurement, high repetition frequency, optical comb, absolute metrology

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DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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