Zhong Nianbing, Liao Qiang, Zhu Xun, Zhao Mingfu, Huang Yun, Chen Rong
Chongqing University of Technology, Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Chongqing 400054, China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China.
Sci Rep. 2015 Jun 26;5:11508. doi: 10.1038/srep11508.
Although the numerous advantages of polymer optical fibers have been exploited in the fields of sensors and telecommunications, such fibers still experience a critical problem: the temperature dependency. Therefore, we explored the temperature-independent operation of a polymer fiber-optic evanescent wave sensor immersed in distilled water. We investigated variations in the surface morphology, deformation trajectory, refractive index, and weight of the fiber-sensing region with varying water temperature. We also examined the spectral transmission and transmitted light intensity of fibers subjected to a heating-cooling treatment. We observed that the light-transmission modes and sensitivity of the sensor were affected by changes in the surface morphology, diameter, and refractive index of the sensing region caused by changes in temperature. The transmitted light intensity of the sensor was maintained at a constant level after five cycles of the heating-cooling treatment, after which the fibers exhibited a smooth surface, low refractive index, and large fiber diameter. Consequently, we utilized the heating-cooling-treated fiber to realize a temperature-independent, U-shaped polymer fiber-optic evanescent wave sensor. The temperature independence was evaluated using glucose solutions in the range of 10 to 70 °C. The fabricated sensor showed significant temperature independence and high degree of consistency in measuring solutions.
尽管聚合物光纤的众多优点已在传感器和电信领域得到应用,但此类光纤仍面临一个关键问题:温度依赖性。因此,我们探索了浸没在蒸馏水中的聚合物光纤倏逝波传感器的与温度无关的运行情况。我们研究了随着水温变化,光纤传感区域的表面形态、变形轨迹、折射率和重量的变化。我们还检查了经过加热 - 冷却处理的光纤的光谱透射率和透射光强度。我们观察到,传感器的光传输模式和灵敏度受到温度变化引起的传感区域表面形态、直径和折射率变化的影响。经过五个加热 - 冷却循环后,传感器的透射光强度保持在恒定水平,此后光纤呈现出光滑的表面、低折射率和较大的光纤直径。因此,我们利用经过加热 - 冷却处理的光纤实现了一种与温度无关的U形聚合物光纤倏逝波传感器。使用10至70°C范围内的葡萄糖溶液评估了温度无关性。所制备的传感器在测量溶液时表现出显著的温度无关性和高度的一致性。