Abstract
For an extrinsic Fabry-Perot interferometric sensor, the compensating demodulation technique to maintain the sensitivity at the quadrature is particularly necessary in applying the interferometer to detecting acoustic emission signals because of signal-fading problems. In this paper, we developed the stabilization control sensor system that is composed of an EDFA (erbium-doped fiber amplifier) source, a Fabry-Perot (FP) tunable filter and a control-circuit board. As an application of the system, we detected a simulated acoustic emission signal induced by a lead pencil-break with the stabilization control sensor system. Finally, the acoustic emissions of fracture signals generated by a tensile test of a cross ply composite specimen were successfully detected with this sensor system.
