WAVEGUIDE DEVICE FOR LIQUID PARAMETER MEASUREMENTS Russian patent published in 2018 - IPC G01N22/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of microwave technology and can be used to measure and control liquids, in particular aqueous solutions and suspensions of substances of a chemical and biological nature in various technological processes, studies of the structure of aqueous solutions, determination of the moisture content of hydrocarbons, including "on-stream", as well as in biophysical researches. Design of the resonant measuring chamber is characterized by the possibility of reliable and stable mechanical tuning and selection of the optimum coupling of the resonator with the waveguide path. Tunable waveguide-dielectric chamber for controlling liquids includes a demountable waveguide chamber. Insert adjacent to the flange of the waveguide path contains a threaded socket for the capacitive pin, which is a cylindrical conductor, installed in the direction of the force lines of the electric field strength E and connected at one end to the wide wall of the waveguide. Between the insert and the flange of the waveguide, there is a shallow groove along which a strip of thin metal can move in the form of a resonant (inductive-capacitive) diaphragm. Dimensions and location of the diaphragm are chosen in such a way that in the waveguide device one obtains the mutual annihilation of waves reflected from the end of the waveguide and from the diaphragm. Waveguide insert comprises a through hole for the dielectric tube into which the measured liquid is poured. Smooth plate closes the through-hole of the waveguide and is a short-circuit of the path. By moving the thin diaphragm, and also the capacitive probe, the maximum Q-value of the resonator measuring system is achieved, which is recorded from the amplitude of the resonance curve on the screen.

EFFECT: difference in the amplitudes of the resonance curve in successive measurements shows the change in the concentration of the substance in the liquid under study, which is associated with a change in the dielectric constant.

1 cl, 1 dwg