Location deviation compensation based on maximum cross correlation in optical frequency domain reflectometry

Abstract

A location deviation compensation algorithm based on maximum cross correlation is proposed for optical frequency domain reflectometry. The characteristic change of fiber under test and the auxiliary interferometer induced by strain/temperature causes location deviation in the optical frequency domain reflectometry system, which in turn leads to demodulation errors. Compared to current available compensated methods, this algorithm simultaneously compensates the location deviation caused by the fiber under test and the auxiliary interferometer. The temperature variation experiments of the fiber under test and the auxiliary interferometer were carried out, respectively, and results show that the algorithm minimized the demodulation errors introduced by the location deviation.

Influence of spectral splicing on the spatial resolution of optical frequency domain reflectometry

“…In 1998, M. Froggatt et al proposed the method that the Rayleigh scattering of optical fiber is equivalent to a random periodic weak reflection fiber grating [3][4], and the temperature/strain at any position of optical fiber can be detected through cross-correlation operation. The optical fiber temperature/strain sensor based on OFDR technology can realize fully distributed and high spatial resolution sensing measurement [5]. After years of research, the distributed fiber optical sensing technology based on OFDR has formed a basic system scheme and signal demodulation algorithm.…”