We propose an alternative design to the wavemeters based on scanning Michelson interferometers. Using realistic
experimental parameters, we show that a relative accuracy of one part in 6x10-8 can be reached with a
displacement of the target mirror of only 360 &mgr;m. This improvment becomes possible thanks to the significant
advances in polarimetry that permit measurement of the ellipsometric parameters &psgr; and &Dgr; with an accuracy of
0.07° with readily-available commercial equipment. This leads to an interpolation rate of &lgr;/10000. The proposed method has been setup and the chief parameters limiting its accuracy are determined.
We show how a Fabry Perot interferometer could be used to determine the gravitational axis of the earth g with an
high sensitivity. Our method lie g axis to an optical beat frequency value between two lasers. The principle is
described and a budget error is presented. The sensitivity of the sensor is estimated to be below of 85 nrad/MHz.
This method could be used as a high sensitivity and absolute tilt sensor or even as a seismometer. This sensor is
dedicated to the french watt balance project as described in this paper.
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