%0 Journal Article
%T Study on the Signal of Laser Doppler Differential Demodulation System<br>激光多普勒差动检波装置的信号研究
%A (National Key Lab of Precision Measuring
%A Testing Technique
%A Instrument
%A Tianjin University
%A Tianjin
%A <br>贺顺忠
%A 刘金凤
%A 蒋诚志
%A 杜振辉
%J 光子学报
%D 2005
%I 
%X 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.
%K Laser Doppler differential demodulation
%K Frequency-tracking of PLL
%K Frequency-voltage transition
%K Measurement on simulative oscillation<br>激光多普勒差动检波
%K 锁相放大器频率跟踪
%K 频率
%K 电压转换
%K 模拟振动测量
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=9F6139E34DAA109F9C104697BF49FC39&aid=94162580BDB72026&yid=2DD7160C83D0ACED&vid=339D79302DF62549&iid=0B39A22176CE99FB&sid=FCD27DC5E1F2EEE7&eid=BC084ACE66B62CC8&journal_id=1004-4213&journal_name=光子学报&referenced_num=3&reference_num=6