Denoising of Laser Self-Mixing Interference by Improved Wavelet Threshold for High Performance of Displacement Reconstruction

This article proposes an improved wavelet threshold denoising for laser self-mixing interference signals. The function exhibits smoothness and continuity near the threshold. By replacing hard or soft with threshold, it can eliminate generation of fake peaks due to local oscillation induced by as well loss over-smoothness Compared denoising, theoretical simulations experimental results demonstrate that displacement vibrations are reconstructed based on denoising.