光子学报 ›› 2011, Vol. 40 ›› Issue (6): 916-920.doi: 10.3788/gzxb20114006.0916

• 光学测量 • 上一篇    下一篇


THz干涉测量用于障碍物后振动传感的研究

刘乔1,李泽仁1,孟坤1,权润爱2   

  1. (1 中国工程物理研究院流体物理研究所,四川 绵阳 621900)
    (2 深圳大学 电子科学与技术学院,广东 深圳 518060)
  • 收稿日期:2010-11-23 修回日期:2011-01-24 出版日期:2011-06-25 发布日期:2011-06-25
  • 通讯作者: 刘乔 E-mail:crystal_palace@163.com
  • 作者简介:刘乔(1973-),男,助理研究员,硕士,主要研究方向为激光干涉测量及太赫兹光谱成像.Email:crystal_palace@163.com
  • 基金资助:

Study of Vibration Sensing Behind Barriers by Terahertz Interferometry

LIU Qiao1,LI Ze-ren1,MENG kun1,QUAN Run-ai2   

  1. (1 Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang,Sichuan |621900,China)
    (2 College of Electronic Science and Technology,Shenzhen University,Shenzhen,Guangdong 518060,China)
  • Received:2010-11-23 Revised:2011-01-24 Online:2011-06-25 Published:2011-06-25
  • Contact: Qiao LIU E-mail:crystal_palace@163.com

摘要:

为探索THz干涉技术用于障碍物后振动传感的可行性,采用工作波长214.58 μm (对应频率约1.4 THz)的CO2激光器泵浦气体太赫兹源搭建了一套基于迈克尔逊干涉仪结构的THz干涉测量装置,实验研究了薄纸板遮挡后敲击目标镜产生的微小振动,利用相位分析法和频谱分析法对振动干涉信号进行处理,得到了振动位移随时间的变化以及不同时段振动频率的分布情况,测得的峰峰值振幅最小为7.98 μm,最大为17.54 μm,振动峰值速度为2.7 mm/s,振动频率最小21 Hz,最大58 Hz.研究结果表明THz干涉测量技术能有效克服传统振动传感技术无法穿透障碍物的缺点,是一种简便有效的障碍物后振动传感的新型手段,预示了THz技术在振动检测相关领域的广阔应用前景.

关键词: 太赫兹, 振动传感, 干涉测量

Abstract:

In order to explore the feasibility of vibration sensing behind barriers by terahertz interferometry,a terahertz interferometer was built based on a Michelson interferometer and using 214.58 μm CO2 laser pumping gas THz source.Small vibrations behind a thin cardboard caused by knocking a target mirror was measured by the terahertz interferometer .With some data processing techniques such as phase analysis and spectrum analysis,vibration time-histories and time-frequence distribution were resolved.The maximum of measured peak-peak amplitude is 17.54 μm and the minimum is 7.98 μm.The calculated peak velocity is about 2.7 mm/s.The maximum and minimum of vibration frequence are 58 Hz and 21 Hz,respectively.The results show that terahertz interferometry is a convenient novel technique that senses vibrations behind barriers,and can effectively overcome disadvantages of conventional vibration sensors.

Key words:  Terahertz, Vibration sensing, Interferometry

中图分类号: