农业装备升降装置非接触式光纤位移传感器设计与试验  

Design and Experiment of Non-contact Fiber Optic Displacement Sensor for Lifting Device

作　　者：闫光[1,2] 卢建中 孟凡勇[1,2] 鹿利单 祝连庆[1,2] YAN Guang;LU Jianzhong;MENG Fanyong;LU Lidan;ZHU Lianqing(School of Instrument Science and Opto-electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China;Beijing Laboratory of Optical Fiber Sensing and System,Beijing Information Science and Technology University,Beijing 100016,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]北京信息科技大学光纤传感与系统北京实验室,北京100016

出　　处：《农业机械学报》2019年第2期147-152,194,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金面上项目(51675053);北京市属高等学校高层次人才引进与培养计划项目(IDHT20170510);长江学者与创新团队发展计划项目(IRT_16R07)

摘　　要：为了解决农业设备位移的宽量程、高灵敏度非接触测量问题,提出一种基于Peanut-shape迈克尔逊干涉结构的非接触式光纤位移传感器。分析了光纤Peanut-shape迈克尔逊干涉原理,设计了将磁场与Peanut-shape结构形成的全纤式迈克尔逊干涉相结合的传感器结构,并通过磁场仿真,得到磁场强度曲线。建立了传感器应变标定系统和位移测试系统。试验结果表明:Peanut-shape迈克尔逊干涉的光纤传感器应变灵敏度达到1. 82 pm/με,是普通光纤的1. 5倍,线性度为0. 997;位移测试得到的光谱曲线与磁场仿真曲线结果一致,可以实现位移的测量,且线性拟合度达到0. 999。In order to solve the problems of non-contact displacement measurement,wide-range and high sensitivity measurement in agricultural machinery equipment,a non-contact optical fiber displacement sensor based on Peanut shape Michelson interference structure was proposed.The Peanut shape fiber Michelson interference principle was analyzed,and the sensor structure combining the magnetic field and the Peanut shape structure in fiber-type Michelson interference was designed,and by simulating the magnetic field,the magnetic field strength curve was obtained,theoretical analysis shows that a good sine wave can be obtained within the range of 1~3 mm between the sensing detector and the magnetic scale.While there is a distance range from 0 mm to 1 mm,due to the large contact area,a sawtooth-like wave is obtained,according to results of theoretical analysis,the distance between the experimental sensor head and the magnetic scale is determined.The strain calibration system and a displacement test system of sensor were established.Experimental result showed that the Peanut shape Michelson interference fiber sensor strain sensitivity reached 1.82 pm/με,which was 1.5 times of that of bare fiber,and the linearity was 0.997;the spectral curve obtained by the displacement test was consistent with the magnetic field simulation curve,displacement measurement can be achieved,and linear fitting degree was 0.999.By encoding the permanent magnets,the direction of motion can be discerned.

关 键 词：农业设备 Peanut-shape 迈克尔逊干涉 磁场 光纤位移传感器 

分 类 号：TP212.12[自动化与计算机技术—检测技术与自动化装置]