METHOD ESTABLISHING CONCENTRATION OF FERROMAGNETIC PARTICLES AND OBLONG DOMAINS IN LIQUID IN SHF RANGE Russian patent published in 2004 - IPC

FIELD: measurement technology. SUBSTANCE: invention is related to methods measuring concentration and dispersity (concentration of large non-round domains) of ferromagnetic particles in liquid. Invention can find use to check and regulate composition and properties of ferromagnetic liquids utilized in chemical and other branches of industry. Proposed method establishing concentration of ferromagnetic particles in liquid includes placement of vessel with liquid in high-frequency electromagnetic and permanent magnetic fields, subsequent recording of changes of parameters characterizing high-frequency radiation, switching off of magnetization current of solenoid, determination of dielectric permittivity average by volume of interaction with phase shift of wave equal to π, ensuring phase shift by adjustment of wave length of generator, correction of value of concentration of ferromagnetic particles responding to change of dielectric permittivity average by volume of interaction, switching on of magnetization current and its rise to value corresponding to ferromagnetic resonance at which moment setting of angle of turn of polarization plane of electromagnetic wave equal to zero is observed, determination of dielectric permittivity average by volume by phase incursion, comparison of its value with value of dielectric permittivity average by volume of interaction found in absence of magnetization current and establishment of concentration of large oblong domains by change of dielectric permittivity average by volume of interaction from given mathematic formula. EFFECT: technical-and-economical effect of usage of proposed method consists in increased quality and improved technology of production of liquids with ferromagnetic particles and ferromagnetic articles thanks to increase of accuracy of measurement of concentration of dielectric permittivity, possibility of establishment of concentration of oblong domains of ferromagnetic particles in liquid.