Lofts : Liquid Core Capillary Based Optical Fiber Fluorescence Temperature Sensor

In this work, we demonstrate LOFTS, a Liquid core capillary based Optical fiber Fluorescence Temperature Sensor. The temperature sensitive solution is first sealed in capillary, which is then incorporated on the tip of an optical fiber to fabricate LOFTS only relying on extremely simple fabrication operations and cost-effective materials. Combining with excitation laser and fiber spectrometer, temperature can be quantitatively measured according to fluorescence signature, yielding the same excellent linear response to temperature in all liquid, gas and solid sample sensing. Proved by temperature sensing on various samples, the proposed LOFTS could measure temperature in high accuracy, good repeatability, stability and reproducibility, and has long conservation time for at least 3 months at 4 °C. This work provides an optimal optical fiber fluorescence temperature sensor in high temperature sensing performance, and more importantly, delivers a new design for simply and cost-effectively fabricated optical fiber fluorescence temperature sensors