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An optical fiber pressure sensor based on the photoelastic effect using a new compensation technique is described in this paper. ’ h o optical sources and a polarization-splittingprism are incorporated into a sensor system to minimize output drifts. The four major factors-the optical source power, the fiber loss, the optical coupling loss, and the modal power distribution in fibers-are well compensated. The measurement range of 0-147 KPa has been obtained with accuracies of 0.2% within the temperature range of -10°C to 42°C and a resolution of 10 Pa has been achieved
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