ABSOLUTE MEASUREMENT OF BASE LINES UP TO 400 M USING TEMPORAL COHERENCE HETERODYNE INTERFEROMETER OF OPTICAL FREQUENCY COMB

H. Matsumoto, X. Wang, K. Takamasu

Abstract

A heterodyne interference system is developed for base-lines measurement by using an acoustic optical modulator and a stabilized optical-frequency comb. The temporal coherence interference with the optical-frequency comb happen at discrete positions, where a pair of pulse trains overlaps with each other. An optical delay of the interferometer with a piezo-electric transducer is realized to find the peak position of interference fringe pattern and the absolute distance is obtained with a high accuracy. The interferometer is applied to a distance of base-lines up to 403 m and the experimental result shows of possibility of measuring within an accuracy of several micrometers.

Keywords

optical frequency comb, absolute distance measurement, temporal coherence interferometry, heterodyne interferometry

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IMEKO-WC-2012-TC14-O12.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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