摘要
太赫兹时域光谱(THz-TDS)技术作为一种新兴的相干探测技术,其发展推动着安全检测和无损检测技术的进步与革新,对保护人们的生命健康、财产安全有着突出的贡献。为了获得更好的成像效果与探测灵敏度,就应在保证获取信号的信噪比符合要求的同时提高对太赫兹信号的探测速度。本文基于渐开线反射面光学延迟线装置,分析了光学延迟线外形参数,对延迟距离为71 mm、延迟时间为236.7 ps的模型进行了仿真。针对旋转反射镜轴心的偏心误差、平面反射镜的安装误差和旋转光学延迟线的出射光斑畸变三个方面进行了误差分析,并讨论了减小误差的方法。为该装置提升时间延迟、获得更加完整的太赫兹光谱,以及进一步提升THz-TDS系统的性能提供理论和仿真基础。
As an emerging coherent detection technology,terahertz time domain spectroscopy(THz-TDS)technology has promoted the progress and innovation of safety testing and nondestructive testing technologies,and has made outstanding contributions to the protection of people’s life and health and property safety.In order to obtain better imaging results and detection sensitivity,it is necessary to increase the detection speed of terahertz signals while ensuring that the signal-tonoise ratio of the acquired signal meets the requirements.Based on the involute reflector optical delay line device,this paper analyzes the optical delay line shape parameters,and simulates a model with a delay distance of 71 mm and a delay time of 236.7 ps.The error analysis is made in three aspects:the eccentric error of the axis of the rotating mirror,the installation error of the planar mirror,and the outgoing spot distortion of the rotating optical delay line,and the method of reducing the error is discussed.It provides a theoretical and simulation basis for the device to increase the time delay,obtain a more complete terahertz spectrum,and further improve the performance of the THz-TDS system.
作者
辛胤杰
李全勇
孙伟
王奇书
王文博
Xin Yinjie;Li Quanyong;Sun Wei;Wang Qishu;Wang Wenbo(Key Laboratory of Photoelectric Measurement and Optical Information Transmission Technology of Ministry of Education,School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第23期149-155,共7页
Laser & Optoelectronics Progress
基金
吉林省科技资源开放共享服务平台与科研条件保障项目(20191004022TC)。
关键词
仪器
测量与计量
太赫兹时域光谱系统
渐开线
光学延迟线
延迟时间
instruments
measurement
and metrology
terahertz time domain spectroscopy system
involute
optical delay line
delay time