Abstract
The Plastic Optical Fiber (POF) sensors can be low-cost or cost-competitive solutions to other sensing techniques due to their advantages, such as immunity to electromagnetic interference, compactness, lightweight, multiplexing capabilities. Scientists and engineers have already developed POF sensors capable of sensing strain, deflection, pressure, refractive index, and more. These make them suitable for structural health monitoring, medicine, environmental, chemical applications. Real-life implementations are subjected to various external factors, including vibrations, environmental conditions, light source fluctuations, component aging. Such factors may influence the fabricated sensor performance. To compensate for these factors, the academic community has explored solutions that utilize an optical coupler to split the optical signal, which then serves as a reference. For large-scale applications, these increase costs significantly. This research explores the influence of extrinsic losses (introduced by manufacturing procedures) and environmental conditions (ambient temperature) on the transmission capacities of the refractive index (RI) evanescent wave absorption POF sensor. The sensor was fabricated using polishing methods and characterized by means of transmission capacities and RI sensitivity (in the range of 1.3330 – 1.4167) at different fabrication stages and extreme ambient temperatures. The findings presented in this paper will be used for the further development of evanescent wave absorption POF sensors, which can be used e.g. for measuring solution concentration, water contamination, etc.
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