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Applications of Time Domain Method in Measurement of Material Parameters

Li Jingde Li Jiabao Shen Wenbin (Department of Physics,Zhongshan University)  
According to the phenomenological theory of relaxation effect,a new methodcalculating frequency spectrum from time domain spectrum is proposed.It is muchsimpler than any other methods.The experiments prove the prediction of phenome-nological theory that the free and random relaxation will appear in a dielectric sam-ple under different conditions.The dielectric spectra of PVDF film and TGS-PVDFcomplex film from 10~(-5) to 10~(-3) Hz have been measured.The method can also beexpanded to measure the response parameters of the resonance type of materials
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