A method for dynamic dielectric measurements at microwave frequencies: Applications to polymerization process studies

A method for measuring dynamic variations of dielectric permittivity at microwave frequencies is given. The technique implies an extension of the cavity perturbation method. Possible volume or density changes of samples are taken into account. Measurements of polymerization processes show that the capabiities of the technique that proved to be very useful for fast, precise, and on-line measurements.