基于空间耦合传输方法的FBG传感器转子涡动测温误差及其影响因素研究  

Temperature Measurement Error and Its Influencing Factors of FBG Sensor under Rotor Whirling Conditions Based on Space-Coupled Transmission Method

作　　者：陈思彤 黄俊斌[1] 顾宏灿[1] 姚高飞 徐丹[2] 李哲宇 CHEN Sitong;HUANG Junbin;GU Hongcan;YAO Gaofei;XU Dan;LI Zheyu(College of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China;College of Electronic Engineering,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory of Electromagnetic Energy,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学兵器工程学院,武汉430033 [2]海军工程大学电子工程学院,武汉430033 [3]海军工程大学电磁能技术全国重点实验室,武汉430033

出　　处：《光子学报》2024年第4期104-119,共16页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11774432)。

摘　　要：针对电机转子涡动对光纤光栅温度监测系统精度产生的影响,采用光纤光栅(FBG)的传输矩阵理论和自聚集透镜的耦合损耗理论,建立了涡动条件下FBG扫描光谱模型,结合相关试验,研究了扫描光谱的畸变规律及系统测温误差的影响因素。结果表明:涡动导致扫描光谱反射峰发生偏移、3 dB带宽减小,通过协调涡动频率和解调仪扫描频率,使准直器间耦合损耗周期达到FBG光谱扫描时间的10倍以上(q>10)是保证较低测温误差的关键;同时,质心法对剧烈涡动条件下扫描光谱的寻峰效果明显优于高斯曲线拟合法。随着转子端面处的径向位移幅值或轴线偏角幅值的增大,系统的测温误差先缓慢地增大、后剧烈地增大;随着椭圆形轴心运动轨迹轴比的增大,测温误差先剧烈地增大、后缓慢地增大至稳定。当转子径向位移幅值小于200μm、轴线偏角幅值小于0.167°时,在轴比等于3、q值等于10条件下,15次采样试验反映出质心法和高斯曲线拟合法分别令系统的测温误差从2.9℃降低至0.6℃和1.1℃,为监测系统的应用与测温精度的预估提供了依据。The increased power of the motor directly results in a higher temperature rise effect on the rotor.High temperatures can cause turn-to-turn short circuits or permanent demagnetization of the motor rotor,which can seriously affect the reliability of the generator operation and the stability of the combat system.Therefore,the research of online rotor temperature measurement technology is of great significance.Compared to electronic sensors,Fiber Bragg Gratings(FBGs)are resistant to electromagnetic interference,small in size,require no power supply,and can be used for quasi-distributed measurements.This is a great advantage for monitoring the motor rotor temperature.However,research on FBG rotor temperature monitoring systems is still relatively rare.The state of motion of the motor rotor is an important factor affecting the accuracy of the system.The effect of rotor whirling on measurement accuracy due to unbalanced mass is even more difficult to ignore and has not been studied.In this paper,a model of FBG scanning spectra under rotor whrling conditions is developed by combining the transmission matrix theory of FBG and the coupled transmission theory of self-focusing lenses.The scanning error of the center wavelength and its influencing factors have been investigated in conjunction with relevant experiments.The results show that the whirling of the rotor leads to aberrations in the scanning spectra of the FBG,which are mainly manifested in the offset of the reflection peaks and the reduction of the 3 dB bandwidth.The main factors affecting the temperature measurement error of the system are the rotor whirling frequency,the demodulator scanning frequency,the radial displacement of the rotor at the end face,the axial ratio of the axial trajectory and the deflection angle of the axis.As the ratio of the coupling loss period to the spectral scan time(q-value)increases,the maximum center-wavelength scan error and the peak-seeking error both show a rapid decrease,followed by a slow decrease to stability.The key to ensur

关 键 词：光纤光栅温度传感器 转子温度监测系统 转子涡动 畸变光谱 测温误差 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]