Loss-compensation technique using a split-spectrum approach for opticalfiber air-gap intensity-based sensors,

摘要

Abstract: referencing technique compensating for fiber losses and source fluctuations in air-gap intensity-based optical fiber sensors is described and demonstrated in this paper. A resolution of 0.007 $mu@m has been obtained over a measurement range of 0 - 250 $mu@m for an intensity-based displacement sensor using this referencing technique. The sensor is shown to have minimal sensitivity to fiber bending losses and variations in the LED input power. A theoretical model for evaluation of step-index multimode optical fiber splice is proposed. The performance of the sensor as a displacement sensor agrees well with the theoretical analysis.!6