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激光多普勒差动检波装置的信号研究
引用本文:贺顺忠,刘金凤,蒋诚志,杜振辉.激光多普勒差动检波装置的信号研究[J].光子学报,2005,34(2):199-201.
作者姓名:贺顺忠  刘金凤  蒋诚志  杜振辉
作者单位:天津大学精密测试计量与仪器国家重点实验室,天津,300072
基金项目:SupportedbytheNationalNaturalScienceFoundationofChinaundercontractofNo. 40274046
摘    要:研究了差动多普勒技术和锁相放大器的频率跟踪技术, 设计了一种精度高、动态范围大的激光多普勒差动检波系统.此系统结构紧凑, 安装调节方便, 可以充分利用激光光能.而且, 它把两束高斯光束的束腰聚焦在被测物体上, 获得了最小光斑和平面波的叠加, 提高了分辨力、信噪比和信号强度.采用频率自动跟踪技术来解决信号丢失问题, 抑制了各种噪声和干扰.模拟实验证明, 振幅测量精度为1%, 频率为0.6%; 分辨力为50 nm, 技术指标是令人满意的.

关 键 词:激光多普勒差动检波  锁相放大器频率跟踪  频率-电压转换  模拟振动测量
收稿时间:2003-12-01

Study on the Signal of Laser Doppler Differential Demodulation System
Institution:(National Key Lab of Precision Measuring and Testing Technique and Instrument, Tianjin University,Tianjin 300072)
Abstract:The differential technology of Laser Doppler and the frequency tracking technology of PLL are studied and a Laser Doppler differential demodulation system with high accuracy and broad dynamic range is designed. The system has the characters of tight structure, convenience on fixing and tuning and can make full use of laser energy. Furthermore, by focusing the waists of two Gauss beams on the object measured, the smallest speckle and the superposition of plane waves are obtained to enhance the resolving power, SNR and the intensity of signal. It tracks the frequency automatically to resolve the dropout of signal and to restrain all kinds of noises and disturbances. It is proved by simulation experiment that the measure accuracy of amplitude and frequency respectively are 1% and 0.6% and the resolving power is 50nm, so the technology indexes are satisfactory.
Keywords:Laser Doppler differential demodulation  Frequency-tracking of PLL  Frequency-voltage transition  Measurement on simulative oscillation
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