本文介绍了天津大学在光纤传感技术研究领域的最新进展。主要为:基于白光干涉实现了非本征光纤法珀和FBG 并行解调,法珀腔长测量误差0.81 μm,FBG 波长测量误差14 pm;基于光纤有源内腔结构实现了乙炔气体传感,灵敏度优于100 ppm;基于保偏光纤实现了分布式传感,灵敏度可达6 cm;基于边缘滤波器开发了光纤光栅解调仪,波长分辨力可达1.2 pm,扫描速率超过200 kHz;采用全光纤OCT 技术实现了牙齿模型的二维、三维扫描;实现了光纤陀螺光纤环的温度、振动等动态特性检测。

The recent progress of fiber sensing techniques in Tianjin University is introduced in this paper. Parallel demodulation for Extrinsic Fabry-Perot Interferometer (EFPI) and Fiber Bragg Grating (FBG) sensors is realized based on white light interference, with EFPI measurement precision of 0.81 μm and FBG wavelength measurement precision of 14 pm. Concentration detection of acetylene is realized by using intra-cavity fiber laser with sensitivity less than 100 ppm. Distributed sensing based on polarization maintaining fiber is realized with resolution of 6 cm. FBG demodulation equipment is developed by using edge filter, with wavelength resolution of 1.2 pm and scan rate more than 200 kHz. Two-dimension and three-dimension scanning of tooth model is realized by using all-fiber optical coherence tomography (OCT). And the dynamic characteristics like temperature and oscillation detection of fiber ring are realized for fiber optic gyroscope.