Theoretical analysis of the optimum wavelength combination in a two-wavelength combination source for optical fiber interferometric sensing

摘要

A two-wavelength combination source can be used to enhance the measurement precision in a white light interferometric system. However, for efficient operation, an optimum wavelength combination has to be chosen. In this paper, a detailed theoretical analysis showing the existence of an optimum wavelength difference in a two-wavelength combination source is presented, where such a wavelength difference forms the basis to construct an optimum wavelength combination. This theoretical analysis is useful in the process of fringe analysis in white light interferometry.