CIRCUITO OSCILLANTE AD ALTA FREQUENZA

摘要

A high frequency oscillatory circuit for ascertaining the mass or concentration of a first material (such as moisture) in a second material (such as tobacco) has a capacitance and an inductance. The dielectric of the capacitance is constituted by the monitored materials, and the capacitance further comprises a stray field condenser with a thin plate-like ceramic carrier for thin film-like electrodes having prongs which alternate with each other. The inductance has a ceramic core for discrete windings which are obtained by providing the core with a thin metallic envelope and by thereupon removing portions of the envelope so as to leave a series of convolutions. The loss angle, dielectric constant and/or elongation of the materials of the carrier and core are not affected by temperature fluctuations.