5. Glossary

Dielectric spectroscopy; dielectric spectroscopy

Technique for measuring the complex impedance of an electrical insulator as a function of frequency, and deducing its permittivity, resistivity and dissipation factor.

Permittivité réelle et imaginaire ; imaginary and real permittivity

The real component ε' is none other than the relative permittivity ε _r ; it represents (give or take a constant) the "susceptibility" of a dielectric to polarize under the effect of an electric field. The imaginary component ε" is known as the relative loss index, because it allows us to find the active power P _a dissipated by the capacitor.

Conductivité AC/DC ; ac/dc conductivity

Conductivity...