基于数据序列匹配的光纤应变传感器原位校准方法  

In-situ Calibration Method of Fiber Grating Strain Sensor Based on Data Sequence Matching and Statistical Analysis

作　　者：蔡静怡 武洁雅 赵春柳 康娟 龚华平 CAI Jingyi;WU Jieya;ZHAO Chunliu;KANG Juan;GONG Huaping(Institute of Optoelectronic Technology,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,杭州310018

出　　处：《光子学报》2022年第6期195-203,共9页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2020YFF0217803)。

摘　　要：针对光纤光栅应变传感器测量桥梁结构应变的准确性问题,提出一种原位校准方法。采用等强度悬臂梁模拟桥梁结构,以砝码为激励源,以电阻应变片作为参考传感器,以光纤光栅应变传感器作为被校准传感器,将这两个传感器安装在靠近的位置进行测量和比对。由于不同传感器特征有差异,被校准传感器的测值序列与参考值序列通常存在数据错位,导致无法判断传感器应变响应的一致性。为此,基于动态时间规整算法的数据序列匹配方法,对电阻应变片和光纤光栅应变传感器的应变数据进行了匹配分析,其数据的匹配率在96%以上。此外,还对数据序列进行了跳点的剔除,避免了突变干扰等因素的影响。结果表明,该方法有效解决了传感器的应变响应是否具有一致性的问题,可以实现光纤光栅应变传感器的原位校准,原位校准结果与静态标定结果基本相同。Strain measurement is an important problem in bridge health assessment.Fiber Bragg grating is a kind of optical fiber passive components with wavelength modulation effect,and has small volume,high corrosion resistance,good electrical insulation measurement precision,good stability,short response time,and the advantages of distributed measurement.Along with the development of technology,optical fiber Bragg grating sensor for structural health monitoring,space exploration,power system measurement,medical equipment improvement,and other fields has been widely concerned.However,in the process of monitoring bridge strain,the sensitivity of FBG strain sensor will decrease due to long-time use.The resistance strain gauge has the advantages of high precision,good consistency and good repeatability,and is commonly used as the strain sensor.Therefore,in practical process,the resistance strain gauge can usually be used as the reference sensor and the FIBER Bragg grating strain sensor as the sensor to be calibrated.Therefore,an in-situ calibration method is proposed for the accuracy of fiber Bragg grating strain sensor in measuring bridge structural strain.The resistance strain gauge was used as the reference sensor,and the FIBER Bragg grating strain sensor was used as the sensor to be calibrated.The temperature was kept unchanged to avoid the wavelength drift of the fiber Bragg grating strain sensor caused by temperature change.The cantilever beam with equal strength is used to simulate the bridge structure,and the weight is used as the excitation source to simulate the loading and unloading process of the bridge load.By referring to the strain measurement of the response of the sensor and the sensor to be calibrated,the two sensors are installed in a close position to measure and compare.In the actual bridge measurement process,due to uncontrollable environmental factors affecting the measurement results,abnormal jump points appear in the strain output waveform,which can affect the calibration coefficient generated by the

关 键 词：光纤布拉格光栅 原位校准 数据序列匹配 应变传感器 数据错位 

分 类 号：TB92[一般工业技术—计量学]