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Multiplexing of electronically scanned white-light interferometric strain sensors based on HB fibers

Application of electronic scanning to a sequence of coherence-multiplexed strain sensors is proposed in this paper. The sensors consist of a cascade of HB fibers spliced with their polarization axes rotated by certain angles. We theoretically analyzed the behavior of such chains as a function of their alignment and found the optimal alignment ensuring readout of every sensor with the maximum S/N ratio. The performance of parallel and serial multiplexing configurations was experimentally studied. As a receiving interferometer we used a Wollaston prism followed by a CCD camera and an image processing system while a stepped delay line made of calcite and crystalline quartz was used to match the group delays between sensing and receiving interferometers.