Abstract
The relationship between the strain and the feedback voltage to a PZT phase modulator in an active homodyne Mach-Zehnder interferometric fibre optic sensor operating beyond the limit of the feedback electronics was linearized. The strain in a carbon fibre/epoxy composite bar during uniaxial tensile loading was measured in two ways: (1) interferometrically, using an embedded optical fibre as sensor, and (2) with conventional resistance strain gauges mounted on the specimen surface. The optically measured strain and the resistively measured strain were in good agreement when the optical fibre was oriented parallel to the carbon fibres. An instrument that combines high resolution with a long range was developed.
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