Envelope peak detection algorithm based on the CEEMDAN in white light interferometry

Abstract

White light scanning interferometry (WLSI) is a key non-contact three-dimensional (3D) morphometry method. The traditional envelope peak detection (EPD) algorithm is a typical WLSI surface recovery algorithm without phase calculation, but its accuracy is susceptible to noise and fitting errors. In this paper, we propose an improved EPD algorithm based on the complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) to solve the above problem. The proposed algorithm can accurately locate the position of the envelope peak. The simulation and experiment results demonstrate that the proposed method is effective in improving the accuracy of the measurements.