Ultrasensitive liquid level sensor based on slice-shaped composite long period fiber grating

• 作者: Xiren Jin Zeju Rui Zihang Xiang Chupeng Lu Shuo Zhang Xian Xu Mingyang Lü Yiwei Ma Cuiting Sun Xinghua Yang Tao Geng Weimin Sun Libo Yuan
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Instrumentation, Measurement, and Optical Sensing
• 页码范围: 37-42
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL202220.011202

摘要

In this paper,a novel liquid level sensor with ultra-high sensitivity is proposed.The proposed sensor is configured by a slice-shaped composite long period fiber grating[SSC-LPFG].The SSC-LPFG is prepared by polishing two opposite sides of a composite multimode-single-mode-multimode fiber structure using a CO2 laser.The method improves the sensitivity of the sensor to external environment.Based on the simulation calculation,a liquid level sensor with a length of 3 mm is designed.The experimental transmission spectrum agrees well with the simulation result.The experimental results show that the sensitivity reaches 7080 pm/mm in the liquid level range of 0-1400 μm in water.The temperature sensitivity is 24.52 pm/℃ in the range of 20℃-90℃.Due to the ultra-high sensitivity,good linearity,and compact structure,the SSC-LPFG has potential application in the field of high-precision liquid level measurement.