Enhancement of Distributed Fiber Optic Vibration Sensors

Abstract

The paper deals with the enhancement of sensor system utilizing the standard single mode optical fiber as a distributed sensor of the mechanical vibrations. Many up-to-date solutions are based on detection of backscattered signals from interrogating optical pulses sent down the sensing optical fiber. Previous solutions suffer from insufficient frequency of optical pulses that is limited by the length of sensing fiber and so is the sample frequency from single point along the fiber, which makes classification of an event less accurate and false alarms may arise. This article presents a technique of information enrichment based on frequency-time division principle.