Compact optical fiber temperature sensor with high sensitivity based on liquid-filled silica capillary tube

• DOI: 10.1364/ao.57.001061
• Publication Date: 2018-02-02T17:02:21Z
• Authors: Yu Mao; Yuxi Zhang; Ruikai Xue; Yi Liu; Kunjian Cao; Shiliang Qu
• Keywords: Fiber Bragg Grating; Repeatability

We propose a highly sensitive fiber temperature sensor based on section of liquid-sealed silica capillary tube inserted in single-multi-single-mode structure. The liquid polymer is filled into the through two micro-holes drilled by femtosecond laser. Then are blocked UV curable adhesive with ultra-small volume. Obvious Mach-Zehnder interference peaks were shown its transmission spectrum. proposed can be reliably used for actual point detection owing to high sensitivity (8.09 nm/°C), good linearity (99.93%), compact size, mechanical property, fabrication efficiency, and repeatability stability.