【作者】 李庆波；

【导师】 王政平；

【作者基本信息】 哈尔滨工程大学 ， 材料学， 2005， 博士

【摘要】 光学电流传感器是指那些利用光学技术直接或间接地对电流换能或测量从而实现对电流传感的装置。用光学电流传感技术取代基于电磁感应原理的电流互感技术是电力输送工业中电流测量与线路保护技术的一场革命性的变革。本文选定以保偏膜式光学玻璃电流传感器(Bulk Glass OCS:BGOCS)为研究对象对其进行全面深入的研究。选题具有理论价值与指导工程实际的意义。 论文建立了BGOCS的数学模型,提出并实现了保偏膜式BGOCS传感头两个光学参量的测量方法以及波片相位延迟角的测量方法,为传感头光学性能实验研究创造了条件;分析了恒定温度条件下反射相移、线性双折射等对BGOCS性能的影响;研究了在环境温度变化导致光源中心波长移动时反射相移、线性双折射和Verdet常数这三个光学参量色散特性及其对系统输出的影响;研究了这三个光学参量各自的温度特性及其对输出尺度因子的影响;研究了环境温度变化导致光源中心波长移动条件下三个光学参量色散特性与温度特性对BGOCS输出尺度因子的联合影响,以期为改进传感头性能、提高其温度稳定性提供理论依据与寻求方向。 研究结果表明,反射相移和线性双折射的存在会降低系统的灵敏度与温度稳定性:光源波长随温度的变化通过三个光学参量色散特性及光学参量自身温度特性对系统输出产生的综合影响在10℃～30℃温度变化范围内可使输出尺度因子相对20℃时可变化1.38%。因此在BGOCS设计中,须对光源和传感头采取有效的温度控制措施或其他如信号处理等措施以提高整个测量系统灵敏度的稳定性。更多还原

【Abstract】 Optical current sensors (OCSs) are the kind of devices that directly or indirectly realizethe transformer measurement of current in order to achieve the sensing of the current. The substitution of OCS for the current-transforming techniques based on electromagnetic induction is a revolutionary evolution in the techniques of current measurement and power line protection in the industry of power transfer. This paper focuses on the study of Bulk Glass Optical Current Sensor (BGOCS). The work is significant in both theory and engineering application.The mathematic model of BGOCS is established in the paper. Measuring methods of two optical parameters (Reflection-lnduced-Retardance: RIR and linear birefringence: LB) of BGOCS with polarization-preserving total reflection layers and of relative phase angle of quarter wave plate were put forward and realized, which established the foundation for the experimental investigation of optical performance of the sensing head. The effects of RIR, LB and parameters of the polarizing elements (polarizing angle and extinction ratio) on the performance of the BGOCT system at constant temperature are analyzed. The effects of central wavelength variation of the optical source due to temperature fluctuation upon the output of the system through the dispersions of the RIR, LB and Verdet constant are studied. The temperature features of the RIR, LB and Verdet constant and their effect on the scale factor of the output of the BGOCT system are presented. The temperature characteristics of the BGOCT system through the combination of the temperature features of the optical source with that of the RIR, LB and Verdet constant are summarized. All of these are on the purpose of providing theory basis for improving the performance of the sensing head and its temperature stability.The results show that the RIR and LB can clearly degrade the sensitivity of thesystem at constant temperature; the joint effect of central wavelength variation of the optical source due to temperature variation from 10℃ to 30℃ through the dispersions of the RIR, LB and Verdet constant and the temperature features of the RIR, LB and Verdet constant upon the output scale factor of the system reaches 1.38% relative to its value at20℃. Therefore, effective temperature-controlling measures to the optical source and the sensing head or other measures like signal processing method have to be taken in the design of the optical current sensors to stabilizing the sensitivity of the measuring system.更多还原