Abstract

A frequency-modulated continuous-wave technique is used to detect phases of backscattered signals in a single-mode fiber. A distributed interferometric sensor system employing this technique is presented, and interrogation of 28 sensing regions is demonstrated. Spatial resolution 0.7 m and a sensitivity of 3 $\text{mrad}\sqrt{\text{Hz}}$ are achieved.

© 1992 Optical Society of America

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