Humidity-insensitive temperature sensor based on a quartz capillary anti-resonant reflection optical waveguide

作者：Shuangqiang Liu, Yingke Ji, Lugui Cui, Weimin Sun, Jun Yang, Hanyang Li · 发表于：Optics Express · 年份：2017 · DOI：10.1364/oe.25.018929 · 被引用次数：42 · 研究领域：Advanced Fiber Optic Sensors、Photonic and Optical Devices、Spectroscopy and Laser Applications

A compact, humidity-insensitive, fiber optic temperature sensor based on a quartz capillary, antiresonant reflecting optical waveguide was proposed and experimentally demonstrated. The transmission spectral responses of the proposed sensor were experimentally investigated regarding temperature variation and environmental humidity. Resonant dips exhibited temperature sensitivity as large as 201 pm/°C from -30 to 45 °C in a humid environment. By coating a sufficiently thick gold film onto the sensor surface, the humidity cross-sensitivity issue was effectively resolved. This proposed sensor was anticipated to find potential applications in humid environments, and moreover, immunity to humidity-sensitivity ensures its applicability in marine environments.