【作者】 张辉；

【导师】 赵耀军；

【作者基本信息】 安徽理工大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 本文设计了一种基于法拉第效应的光纤电流传感器。传感头使用块状重火石玻璃ZF6制成。为了补偿偏振光在传感头中反射产生的相位差,传感头被设计成具有相位补偿功能的几何行状。设计的光纤电流传感器使用了TMS320VC5402DSP芯片完成信号处理工作,使得系统的精度和实时性得到极大提高;使用单片机作为上位机控制DSP处理数据和液晶显示屏显示测量结果,可以同时显示电流的瞬时值、有效值和频谱特性。 设计了光纤电流传感器的光路系统,建立了传感头能够进行几何相位补偿的数学模型,并推导出了用双光路检测法进行温度补偿的数学模型。 其次,设计了具有温度补偿功能的光源驱动电路、放大滤波电流和信号处理电路,并编制了系统驱动程序。 最后,设计和建立了实验系统,对实验数据进行分析计算得出了光纤电流传感器的各项性能参数,结果表明各项性能均达到了设计要求。对光纤电流传感器的温度特性进行了实验,得出了温度补偿公式,通过软件对测量结果进行了补偿,使系统具有了良好的温度稳定特性。 本文所设计的光纤电流传感器的量程为0～1000安培,精度达到了0.3%,非线性≤0.3%,响应时间小于2微秒,灵敏度为0.9992。更多还原

【Abstract】 A optical fiber current sensor (OCS) has been developed in this thesis. The sensing head is made of a block of flint glass ZF6, and it has been designed into a particular shape in order to reduce the phasic difference generated by refraction in the sensing head. This OCS uses a TMS320VC5402 digital signal processor (DSP) to process digital signal, it makes the OCS can get a real-time measure result. A singlechip was used to control the DSP and a liquid crystal display screen;the screen can display the current’s instantaneous value, effective value and spectral parameters.At the beginning of the thesis, the opticator of OCS was designed. And the phase-compensation mathematic model of geometric approach has been deduced. The mathematic model of temperature compensation of the two-luminous-beam measuring method was also deduced.Secondly, the amplification-filter circuit, the signal processing circuit and the illuminant drive which can compensate the fluctuation of temperature are designed. And the system drivers have programmed.Finally, the experimental system has been designed and set up. The performance parameters of OCS have been calculated from the test data. The performance parameters meet the requirements of design. Temperature characteristic of OCS has been tested, and the temperature compensation function is founded. And the measure results of OCS have been corrected by software, so the OCS had good stableness of temperature.The performance parameters of the OCS:Range ability: O-1O0OA;Accuracy: 0.3%;Non-linearity: <0.3%;Response time: <2us;Sensitivity: 0.9992更多还原