1 北京理工大学 机械与车辆学院激光微纳制造研究所, 北京 100081
2 北京特种机械研究所, 北京 100143
提出一种干涉式全光纤传感器, 能够同时实现对折射率和轴向拉力或温度进行双参数测量。传感器由一个微腔和一个纤芯失配衰减器组成。其中微腔结构是由飞秒激光加工光纤纤芯形成, 直径和深度分别是6μm 和2.5μm。该干涉式传感器可以获得20dB的高品质干涉对比度。传感器透射谱波长为1496.68nm和1533.18nm的两个衰减峰对应的折射率灵敏度分别为-29.91nm/RIU和-16.72nm/RIU, 拉力灵敏度分别为-1.55pm/με和-0.31pm/με。实验结果表明, 传感器通过灵敏度矩阵可以同时测量折射率和轴向拉力或温度两个参数。
飞秒激光加工 光纤传感器 马赫-曾德干涉仪 femtosecond laser fabrication optical fiber sensor Mach-Zehnder interferometer
Author Affiliations
Abstract
A fiber inline interferometric refractive index (RI) sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 \mu m are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to ~361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is ~20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.
060.2280 Fiber design and fabrication 060.2370 Fiber optics sensors 220.4610 Optical fabrication Chinese Optics Letters
2013, 11(11): 110603
Author Affiliations
Abstract
A high temperature sensor based on an ultra-abrupt tapered fiber Michelson interferometer fabricated by the fusion-splicing method is proposed. The sensor consists of a single abrupt taper and the cleaved surface is used as the reflection mirror. The thermal characteristic is investigated at 25 to 1 000 oC. The sensitivity of the sensor is observed to vary with the temperature, that is, 25 and 78 pm/ C at 25–300 and 300–1 000 oC, respectively. The Michelson interferometer sensors have the advantages of simple structure, cost effectiveness, compactness, and simple fabrication process.
280.4788 Optical sensing and sensors 060.2370 Fiber optics sensors 120.3180 Interferometry Chinese Optics Letters
2012, 10(12): 122801
1 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2 Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
3 Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA
4 Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
