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Volume 28 Issue 2
Sep.  2013
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Study on demodulation system of laser Doppler

  • 1.

    National Laboratory of Precision Measuring and Testing Technique and Instrument, Tianjin University, Tianjin 300072, China

  • Received Date: 2003-07-18
    Accepted Date: 2003-10-13
  • To improve the specifications of seismometers,laser Doppler measurement technique and weak signal detect technology and etc are studied,and a differential Doppler demodulation system with a LD is designed.In this system,more Doppler signals are received and more space resolving power are achieved because of adopting Gaussian beams focus and lens with large diameter as well as acoustooptic modulation technology and lock-in amplifier used to improve SNR.It has characteristics of simple structure,fixing and adjusting convenience,high use-ratio of light power and space resolution.The measurable ranges of frequency and amplitude are 0.5Hz～1000Hz, 2μm～5mm respectively,and the corresponding measurement precisions are 0.6%,1% respectively.
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  • [1] 付清锋,周明.石油仪器,2000,14(2):25～27.
    [2] DRAIN L E.激光多普勒技术.北京:清华大学出版社,1980.105,137.
    [3] 周炳琨,高以智,陈家骅.激光原理.北京:国防工业出版社,1980.345～357.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Study on demodulation system of laser Doppler

  • 1. National Laboratory of Precision Measuring and Testing Technique and Instrument, Tianjin University, Tianjin 300072, China
  • Received Date: 2003-07-18
  • Accepted Date: 2003-10-13
  • Available Online: 2004-03-25

Abstract: To improve the specifications of seismometers,laser Doppler measurement technique and weak signal detect technology and etc are studied,and a differential Doppler demodulation system with a LD is designed.In this system,more Doppler signals are received and more space resolving power are achieved because of adopting Gaussian beams focus and lens with large diameter as well as acoustooptic modulation technology and lock-in amplifier used to improve SNR.It has characteristics of simple structure,fixing and adjusting convenience,high use-ratio of light power and space resolution.The measurable ranges of frequency and amplitude are 0.5Hz～1000Hz, 2μm～5mm respectively,and the corresponding measurement precisions are 0.6%,1% respectively.

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