An Ultra-High-Resolution Bending Temperature Decoupled Measurement Sensor Based on a Novel Core Refractive Index-like Linear Distribution Doped Fiber

Sensors

Li Fan¹  Yunshan Zhang²  Zhaokui Wang²  Yulin Zhang²  Linxing Kong³  Xiafen Hu⁴  Dan Wu⁴ 

[1] Beijing Tianji Space Technology Co., Ltd., Beijing 100084, China;School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;School of Opto-Electronic Information Science and Technology, Yantai University, Yantai 264005, China;System Design Institute of Hubei Aerospace Technology Academy, Wuhan 430040, China;

关键词: high resolution;    bending sensor;    temperature sensor;    decoupling measurement;   

DOI  :  10.3390/s22083007

来源: DOAJ

【 摘 要 】

A high-resolution and high-sensitivity fiber optic sensor based on the quasi-linear distribution of the core refractive index is designed and fabricated, which enables decouple measurement of bending and of temperature. First, single-mode fiber doped with Al₂O₃, Y₂O₃, and P₂O₅ was drawn through a fiber drawing tower. The fiber grating was engraved on the fiber by a femtosecond laser. Modeling analysis was conducted from quantum theory. Experimental results show that the bending sensitivity of the grating can reach 21.85 dB/m⁻¹, which is larger than the reported sensitivity of similar sensors. In the high temperature range from room temperature to 1000 °C, the temperature sensitivity was 14.1 pm/°C. The doped grating sensor can achieve high temperature measurement without annealing, and it has a distinguished linear response from low temperature to high temperature. The bending resolution can reach 0.0004 m⁻¹, and the temperature resolution can reach 0.007 °C. Two-parameter decoupling measurement can be realized according to the distinctive characteristic trends of the spectrum. What’s more, the sensor exhibits excellent stability and a fast response time.

【 授权许可】

Unknown