THz脉冲电光采样自动平衡探测系统  

Auto-Balance Detection System for THz Pulse Electro-Optical Sampling

作　　者：何明霞[1,2] 郑峥[1] 王月宾[3] 李萌[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072 [2]天津大学太赫兹中心,天津300072 [3]天津大学超快激光研究室,天津300072

出　　处：《新技术新工艺》2010年第4期7-9,共3页New Technology & New Process

基　　金：天津市国际科技合作专项(07ZCGHHZ01100)

摘　　要：利用平衡探测原理分析了1/4波片的光轴与渥拉斯顿棱镜光轴夹角大小的重要性,并设计了一个自动调整系统。系统以PIC18F2423单片机为控制单元,采用THz波双光束电光平衡探测方式,通过电动机专用驱动芯片L297和L298控制步进电动机旋转,调整1/4波片的光轴与渥拉斯顿棱镜光轴夹角的大小。试验结果证明,该系统实现了THz波探测时双光束自动平衡的功能,解决了THz-TDS系统中电光平衡探测的一个自动操作问题。The importance of the size of the angle between the quarter wave plate optical axis and the Wollaston prism optical axis is analyzed through the balancing detecting theorem and an auto-adjusting system is designed. The system takes PIC18F2423 micro-control-unit （MCU） as the control unit,uses a THz electro-optics balance 1/4 detection method and adjusts the angle between the optical axis of the quarter wave plates and the Wollaston prism through stepper motor driver chips L297 and L298 to control the stepper motor rotation. Experimental results prove that this system has realized the function of THz wave detection self-balancing,achieving an automatic operation of THz-TDS system based on electro-optics balance detection.

关 键 词：太赫兹波 光电平衡探测 自动平衡 单片机 步进电动机 

分 类 号：TP272[自动化与计算机技术—检测技术与自动化装置]