laser technique time delay adjusting core energy energy meter
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WEI Hai-chao1,
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WANG Zhi-bin1,2,
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LI Xiao1,2,
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ZHAO Dong-e1,2, , ,
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WANG Yan-chao1,
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CHEN You-hua1,
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CHEN Yuan-yuan1,
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ZHANG Rui1
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1.
Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument, North University of China, Taiyuan 030051, China;
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2.
Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education, North University of China, Taiyuan 030051, China
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Corresponding author:
ZHAO Dong-e, zhaodonge@nuc.educ.cn
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Accepted Date:
2012-10-18
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Abstract
In order to solve the problem of the resonant frequency drift caused by the heat produced by high-frequency vibration in a photoelastic modulator interferometer,its thermal regime model was built based on similarity and modeling theory.The nonlinear function relationship among resonant frequency,temperature of the interferometer and outside drive signal was obtained.Finally,the thermal feedback current,the phase relationship between the feedback current and driving voltage,the change rates of the temperature and resonant frequency with time were deduced and the state equation of frequency stability of the interferometer thermal regime model was obtained.Analysis shows that according to thermal feedback mechanism,phase locked tracking theory must be used to maintain drive frequency consistent with resonant frequency of the interferometer all the time so that the interferometer can work stably.
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