Abstract
A software-based temperature-compensated fiber-optic white-light interferometric (WLI) strain sensor is presented. Measurement error of this sensor is studied theoretically and experimentally. The results quantitatively indicate how the CCD camera pixel resolution, interference fringe pattern center determination errors, strain sensing sensitivity, sensing fiber and compensating fiber lengths affect the measurement errors. Measurement accuracy limitation for the individual strain and temperature sensors with specified highly birefringent fibers and WLI decoding system is also investigated. The main sources of the central fringe position measurement error as well as solutions for further improvements are particularly discussed. Critical factors for sensor design and potential for civil and composite structure monitoring are highlighted by comparing sensitivities, fiber length limitation, power budget and dynamic ranges with those of other fiber interferometers. The analysis provides a convenient way for sensor design to satisfy applications with different accuracy requirements.
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