光纤大电流传感器.doc

摘 要 随着电压和电流等级的提高，传统的电磁式电流互感器不能满足测量的要求，光纤电流传感器以其特有的优势，受到广泛的关注。 本文对国内外的光纤电流传感器的研究状况进行了综合的概述，针对现行光纤电流传感器的不足，改进了相位调制型光纤电流传感器，利用Jones矩阵分析法建立了反射式光纤电流传感器的理论模型。并针对反射式光纤电流传感器进行了器件的选择。 根据传感器的输出信号的特点，设计了信号处理电路。对信号进行了光电转换和前置放大，然后使用相关检测技术，将一次谐波的幅值转变成直流信号。然后设计低通滤波器分离直流信号，最后设计了处理器电路完成信号的AD转换，用于信号的数字处理和输出显示。 关键词:光纤电流传感器，法拉第效应，相关检测，信号仿真 ABSTRACT As the inerease of the current and voltage，the traditional eleetromagnetiec current transformer could not satisfy the requiremenis of the measurement. The fiber-oPtic current sensor was investigated for its uniqueadvantages. The research aehievements of the fiber-optic current sensor have been summarizedin the paper. Ther efleetive fiber-oPtic current senso rhas been designed basing on the Phase modulated modulated type fiber-optic current sensor. The theory current sensor has been established using Jones matrix devices have been chose.model of the reflective fiber-optic analyzing method and the proper device have been chose. According to the characteristics of the sensors output, signal processing circuits including photoelectric translating circuit, preamplifier, correlation detector, low-pass filter and ARIvI processor have been designed. The fundamental wave was changed into direct-current component through correlation detector, and then the direct-current component was separated by low-pass filter. At last, the AD conversion was completed by ARM processor to do signal processing and output display. The simulation mode was established in the Matlab environment. The simulation analysis as well as the noise analysis was carried out. Finally, the analysis of the relationship between sensors input and output was analyzed by using function-fitting method. The fitting coefficients and error were given and quadratic or quartic curve fitting was proposed. KEYWORDS: fiber-optic sensor, Faraday effect, correlation deltection, signal simulation 前 言 作为信息时代的今天，传感技术、通信技术和计算机技术在产业信息中起着非常重要的作用，成为现代信息产业的三大支柱，分别承担着信息的采集、传输、处理和储存等任务。其中传感器作为采集信息的部件，占有非常重要