16 May 2007 Absolute method for an optical measurement of the earth gravitational axis: application to Watt balance
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Abstract
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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Karim Ouedraogo, Suat Topsu, Luc Chassagne, Patrick Juncar, Jamil Nasser, Yasser Alayli, "Absolute method for an optical measurement of the earth gravitational axis: application to Watt balance", Proc. SPIE 6585, Optical Sensing Technology and Applications, 65852G (16 May 2007); doi: 10.1117/12.722737; https://doi.org/10.1117/12.722737
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