An automated coaxial line system for determining the permittivity of a liquid

A method is described which enables measurements taken on a coaxial line to be automatically recorded onto computer paper tape. The description is divided into two parts: the standing wave technique for the low loss liquids and the travelling wave for those of higher loss. Unlike in existing methods, the travelling wave results are obtained by observing the output of a microwave bridge as it goes off balance. Another feature is that both methods have involved a departure from the usual superheterodyne detection system.