Simultaneous and accurate measurement of the dielectric constant at many frequencies spanning a wide range

Abstract

We present an innovative technique which allows the simultaneous measurement of the dielectric constant of a material at many frequencies, spanning a four orders of magnitude range chosen between 10 --2 Hz and 10 4 Hz. The sensitivity and accuracy are comparable to those obtained using standard single frequency techniques. The technique is based on three new and simple features: a) the precise real time correction of the amplication of a current amplier; b) the specic shape of the excitation signal and its frequency spectrum; and c) the precise synchronization between the generation of the excitation signal and the acquisition of the dielectric response signal. This technique is useful in the case of relatively fast dynamical measurements when the knowledge of the time evolution of the dielectric constant is needed.

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• Evidence of growing spatial correlations at the glass transition from nonlinear response experiments
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Cited by in corpus (3)

• Simultaneous memory effects in the stress and in the dielectric susceptibility of a stretched polymer glass
• Relaxation time of a polymer glass stretched at very large strains
• Dynamic stiffness of the contact between a carbon nanotube and a flat substrate in a peeling geometry