НOMODYNE QUADRATURE DISPLACEMENT INTERFEROMETER FOR A NEW KILOGRAM MASS STANDARD BASED ON THE WATT BALANCE
G.N. Vishnyakov1,2, V.L. Minaev1,3
1The All-Russian Research Institute for Optical and Physical Measurements, Moscow, Russia
2Bauman Moscow State Technical University, Moscow, Russia
3Higher School of Economics, National Research University, Moscow, Russia
Keywords: Watt balance, displacement interferometer, homodyne, quadrature signals
Abstract
In a new Russian kilogram mass standard based on the Watt balance, it is proposed to use an interferometer for measuring the displacements and velocities of the electromagnetic coil and the proofmass in the vertical direction. Based on the formalism of Jones matrices, the paper describes the optical scheme of a three-channel homodyne displacement interferometer with a quadrature principle of phase detection. The results of modeling an algorithm for compensating for nonlinear effects arising from quadratic detection of interference signals are considered. The results of experimental studies of the layout of a homodyne quadrature displacement interferometer are presented, and it is shown that the displacement measurement error according to the PV criterion does not exceed 0.2 nm.
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