Correlation Processing of the Signals of the Single-Fiber Intermode Interferometer with a Small Number of Excited Modes

Abstract

Possibilities of obtaining quantitative information about the deformation influence on the SFMI with a small number of excited modes by using a correlation method are investigated. It was shown that usage of diffusive scatterer allows us to transform the radiation of SFMI to a speckle field which can easily be processed. The working range of the SFMI deformation measurements is 0 – 160 µm with precision up to 10 µm.

Using a multimode polymer optical fiber as a high sensitivy strain sensor

“…In [2,3] it has been shown, theoretically and experimentally, that the correlation coefficient between two speckle patterns at the output of multimode fiber before and after deformation, respectively, is associated with maximal additional phase difference between guided modes by:…”

Correlation Processing of Speckle Pattern in Multimode Polymer Optical Fiber for Deformation Monitoring in Nanometer Range

“…In [19,20] it has been shown, theoretically and experimentally, that the correlation coefficient between two speckle patterns at the output of multimode fiber before and after deformation, respectively, is associated with maximal additional phase difference between guided modes by:…”