A FAST PHASEMETER FOR INTERFEROMETRIC APPLICATIONS WITH AN ACCURACY IN THE PICOMETER REGIME

Paul Köchert, Jens Flügge, Christoph Weichert, Rainer Köning, Eberhard Manske

Abstract

The lock-in principle is a preferred method to determine the phase difference between elec trical signals of heterodyne interferometer. A phase meter based on this method was devel oped at PTB allowing to detect fractions of an optical fringe in the range of a few picometers, which is verified by experimental results.

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IMEKO-TC14-2011-34.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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