Abstract

Abstract Optical-fibre mechanical sensors show some advantages over existing technologies. Higher sensitivity, dielectric properties and compatibility with communication technologies are some of their common characteristics. Sensors based on fibre interferometers are very sensitive to phase changes along the light path produced by mechanical perturbations on the fiber. A Mach—Zehnder fibre interferometer has been mounted and tested. The interferometer performance has been studied, comparing its output with the signal measured with calibrated probes. Two kinds of vibrations have been measured: vibrations of a piezoelectric transducer and acoustic plane waves travelling through a water cell.

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