MEASUREMENT OF DIELECTRICS IN TIME DOMAIN

The time dependence of the reflection of a step pulse from the interface between air and a dielectric medium in a coaxial line has been measured from 30 psec to 200 nsec, corresponding to a frequency range of 1 MHz to 5 GHz. The high-frequency and low-frequency dielectric constant, the relaxation time, and the dielectric loss can be obtained in a fraction of a second. Different alkyl alcohols have been measured over a wide temperature range. The results are essentially the same as obtained in the frequency domain.