Application of the Electrometric Method for Determining the Free Water Content in Jet Fuels

The article provides an analysis of the deficiencies of fuel purity control tools for jet engines currently in use. It presents theoretical and experimental studies of the dependence of the loaded quality of a cylindrical cavity resonator on the volume of water placed in it, on the basis of which a method of determining the concentration of free water in jet fuels by the direct electrometric method using a microwave resonator is proposed.

Ultra-fast pyrolysis of lignocellulose using highly tuned microwaves: synergistic effect of a cylindrical cavity resonator and a frequency-auto-tracking solid-state microwave generator

Precisely tuned microwaves facilitate rapid pyrolysis of lignocellulose.

A Simple Permittivity Calibration Method for GPR-Based Road Pavement Measurements

Cylindrical resonator principle can be used in GPR asphalt quality measurement calibration. This method relies on ordinary drill core samples that are regularly taken from measured road sections, but now only analyzed for dimensions, density and sometimes chemically. If such a drill sample is covered with proper conductive surfaces, a cylindrical cavity resonator is formed. The baseline of the GPR permittivity recordings can so be found by measuring the resonance behaviour of this covered sample, which can later still be used for those traditional analyses. A clear benefit is the resonator’s 1–2 GHz frequency range which equals that of common commercial GPR systems. Example results and reference readings from known dielectric material are shown. The obtained uncertainty in this case study is 0.02 units of permittivity, when measuring the same sample repeatedly.