Abstract
The recently developed transmission-type extrinsic Fabry-Pérotinterferometric (TEFPI) optical fiber sensor can simply and effectivelycompensate for the difficult distinction of the measured direction ofconventional EFPI optical fiber sensors. The TEFPI optical fiber sensor signalis composed of fringes and signal level variations, which correspond to themeasured quantity and measured directions, respectively. In this paper, thesignal processing algorithm, the fringe tracking method, is presented forTEFPI optical fiber sensors with a signal that differs from conventionalinterferometric sensors. The algorithm is verified by application to simulatedand experimental sensor signals from strain measurements. The algorithmsuccessfully processed TEFPI optical fiber sensor signals by finding thecorrect positions of peaks, valleys and signal levels, and by calculatingthe exact measured quantity and directions.
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