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Lu Chongwu and Yang Jiang(Institute of Seismology,CEA,Wuhan 430071)  
The structure,principle of the difference extensometer and the experimental results are introduced.The results show that difference extensometer is better than available instruments in the capability for anti-jamming,especially,it can particularly restrain the interference of common mode from the environmental vibration,the power fail in a moment and power noise.
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