Optical fiber sensing device and method

Abstract

An optical fiber sensing device of the present disclosure includes: an optical fiber sensor system including a plurality of sensor units having different propagation delay times; a first light source for outputting an incident light to the optical fiber sensor system; a second light source for outputting a local light for combining with a transmitted light through the optical fiber sensor system; and a signal processing unit for detecting a change in an optical fiber using a received light signal I(t) obtained by combining the transmitted light and the local light, and, given that τi is an inter-optical-path propagation delay time difference at an i-th sensor unit of the sensor units, a change at the i-th sensor unit is derived using an autocorrelation between an optical intensity I(t) at the sensor unit and a signal I(t+τi) obtained by shifting the optical intensity I(t) by a time τi.

Dependencies are inferred from the claim text.