Application of vortex beam interference in displacement measurement

Aiming at the characteristics of vortex beam and plane wave interference, as well as vortex beam self-conjugate interference, this report presents methods for microscopic displacement measurements using petal-like interferograms of vortex beam interference, which has been validated by theoretical analysis, simulations and experiments. On the basis of verifying the linear relationship between interference fringe Angle and micro-displacement through experiments, further, the information processing of petal-like interferogram is explored, and the corresponding fringe extraction method and error correction method are proposed, which provides a new detection scheme and technical approach for eddy light interference detection to be applied to nano level micro-displacement measurement.