弹光调制测晶体电光系数的数字锁相实现

发布时间：2018-08-15 18:24

【摘要】：在弹光调制测晶体电光系数系统中,对弹光调制器工作控制和调制信号数据处理进行了优化设计,并实现一种灵敏度高、测量快速、成本低和系统集成度高的晶体电光系数测量方案.针对弹光调制及调制信号的特点,采用现场可编程门阵列完成弹光调制器的工作控制和测量数据的提取.现场可编程门阵列提供弹光调制器工作电压信号,控制模数转换器的采样频率,同时产生正弦和余弦参考序列来提取直流项、一倍频项的同向分量和正交分量,并输入计算机中求解得出晶体电光系数.对铌酸锂样品进行了测试,实验结果表明系统重复度和灵敏度为0.0016×10~(-12) m/V,测量速率为1ms/数据点.较其他晶体电光系数测量方法,本文方法具有更高的测量灵敏度和更快的测量速率,为实现弹光调制测量晶体电光系数的智能系统奠定了基础.
[Abstract]:In the system of measuring crystal electro-optic coefficients by elasto-optic modulation, the optimum design of the operation control and modulation signal data processing of the elasto-optic modulator is carried out, and a scheme of measuring crystal electro-optic coefficients with high sensitivity, fast measurement, low cost and high system integration is realized. The field programmable gate array provides the voltage signal of the elasto-optic modulator, controls the sampling frequency of the analog-to-digital converter, and generates a sine and cosine reference sequence to extract the DC term, the co-direction component and the quadrature component of the doubling frequency term, which are input into the computer and solved. The results show that the repeatability and sensitivity of the system are 0.0016 (-12) m/V and the measuring rate is 1 ms/data point. Compared with other methods of measuring crystal electro-optic coefficients, this method has higher measuring sensitivity and faster measuring speed, which can realize the measurement of crystal electro-optic modulation. The intelligent system of optical coefficient has laid the foundation.
【作者单位】：中北大学计算机与控制工程学院;山西省光电信息与仪器工程技术研究中心;
【基金】：国家国际科技合作专项项目(No.2013DFR10150) 国家自然科学基金(Nos.61127015、61505180)资助~~
【分类号】：O73;TN761

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