The development of precision manufacturing puts forward higher requirements for the measurement accuracy of grating heterodyne interference displacement measurement, while its nonlinear error is one of the main factors that influence measurement accuracy. A synthetic model of nonlinear error including six error sources is established, and the influence of various nonlinear error sources is analyzed according to the phase expression of nonlinear error derived from the model. When the installation error γ = θ = 1 deg and the performance of optical elements α = β = 0.5 deg, dε1 = 0.1 deg, dε2 = − 0.1 deg, Tp = 0.95, Rp = 0.05, Rs = 0.98, Ts = 0.02, ηp = 0.4, ηs = 0.35, nonlinear error will reach 2.32 nm. We provide a theoretical basis for compensating the nonlinear error of grating interferometers. |
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CITATIONS
Cited by 2 scholarly publications.
Error analysis
Diffraction gratings
Interferometers
Polarization
Diffraction
Complex systems
Heterodyning