Abstract
In the case of an extrinsic Fabry–Perot interferometric sensor, a phase compensatingtechnique is particularly necessary in applying the sensor to detecting an acoustic emissionsignal because of a fade-out problem. The technique makes it possible to maintain thephase at the quadrature point. In this paper, we developed the phase-stabilization controlsensor system, which is composed of a broadband light source, a fiber Fabry–Perot(FP) tunable filter and a control-circuit board. We verified the performance ofthe developed stabilization sensor system through two preliminary tests. Onewas a test on the stabilization of the phase and the other was a pencil-breaktest. Finally, the acoustic emissions of fracture signals generated by a tensiletest of a cross-ply composite specimen were successfully detected with the helpof the phase-stabilization control system, which solved the fade-out problem.
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