准确检测液位的光纤Bragg光栅弹性膜片传感器  

Fiber Bragg Grating Elastic Diaphragm Sensor for Accurate Detection of Liquid Level

作　　者：杜锋 姚建南 陶奕霏 许愿 丁超[2] 刘洋[2] DU Feng;YAO Jiannan;TAO Yifei;XU Yuan;DING Chao;LIU Yang(Jiangsu Vocational College of Electronic Information,Huai’an 223003,China;Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument,Intelligent Fiber Sensing Technology of Chongqing Municipal Engineering Research Center of Institutions of Higher Education,Chongqing Key Laboratory of Optical Fiber Sensing and photoelectric Detection,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]江苏电子信息职业学院,江苏淮安223003 [2]现代光电检测技术与仪器重庆市高校重点实验室,智能光纤感知技术重庆市高校工程研究中心,重庆市光纤传感与光电检测重点实验室,重庆理工大学,重庆400054

出　　处：《压电与声光》2024年第5期794-800,共7页Piezoelectrics & Acoustooptics

基　　金：江苏省产学研合作项目(BY2013015);重庆市科技局创新发展联合基金(市教委)(CSTB2022NSCQ-LZX0059);重庆市高校创新研究群体项目(CXQT21035);国家自然基金项目(52176178)。

摘　　要：为了准确测量液位,研制了一种耦合光纤布喇格光栅和弹性膜片的液位传感器。该传感器由两个光纤光栅(FBG_1和FBG_2)、弹性膜片、弹性橡胶密封垫片、空心管(导气管)和光纤光栅固定装置组成。光纤光栅固定装置材料为聚甲基丙烯酸甲酯。FBG_1和FBG_2固定在弹性膜片表面。FBG_1用于监测液位高度和温度。将FBG_2封装在不锈钢毛细管中进行温度检测,消除液相温度变化对液位测量的负面影响。为了提高传感器检测液位的线性度,实验研究了弹性膜片厚度对液位测量结果的影响,并在此基础上研究了液位变化率和外部振动对液位测量精度的影响。结果表明,当弹性膜片厚度为2 mm时,传感器检测液位的线性范围为0~380 cm,灵敏度为(19.65±6.3)pm/cm。该传感器可在0~100 cm/min液位变化速率和0~5.27 mm/s外部振动强度范围内准确监测液位,最大检测误差为7.2%。To detect liquid levels accurately,a liquid-level sensor is fabricated by coupling fiber Bragg grating(FBG)and an elastic diaphragm.The sensor is composed of two FBGs(FBG_1 and FBG_2),an elastic diaphragm,an elastic rubber sealing gasket,a hollow tube(an air duct),and an FBG fixing device.The FBG fixing device is composed of polymethyl methacrylate.FBG_1 and FBG_2 are fixed to the surfaces of elastic diaphragms.FBG_1 is used to monitor the liquid level and temperature.FBG_2 is encapsulated in a stainless-steel capillary tube to detect the temperature and mitigate the adverse effect of liquid-phase temperature changes on liquid-level measurement.The effect of the elastic-diaphragm thickness on liquid-level measurement is experimentally investigated to improve the linearity of the sensor’s liquid-level measuring capabilities.Additionally,we investigate the effect of the liquid-level change rate and external vibration on the liquid-level measurement accuracy.The results show that under an elastic-diaphragm thickness of 2 mm,the sensor’s linear range for detecting the liquid level is 0-380 cm,with a sensitivity of(19.65±6.3)pm/cm.The sensor can accurately monitor the liquid level within a liquid-level change rate of 0-100 cm/min and an external vibration intensity of 0-5.27 mm/s,with a maximum detection error of 7.2%.

关 键 词：光纤布喇格光栅 液位传感器 测量范围 精度 灵敏度 

分 类 号：TN384[电子电信—物理电子学] TN253