NON-DESTRUCTIVE UNF METHOD FOR CONTROLLING MOISTURE LOAD OF SOLID MATERIALS AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2006 - IPC G01N9/36 G01N22/04 

FIELD: technology for determining moisture load of solid materials, possible use for construction, chemical and other industries.

SUBSTANCE: UHF method for determining moisture load of solid materials on basis of Brewster angle includes positioning researched material into high-frequency electromagnetic field with following registration of parameters alternation, characterizing high-frequency emission. Ring-shaped multi-slit antenna with electronic-controlled direction diagram excites electromagnetic wave, falling onto dielectric material. Direction diagram inclination angle is measured until moment, at which minimal power of reflected wave is detected, wave length of UHF generator is determined and Brewster angle is calculated. Then on basis of normalized mathematical formulae moisture load value of surface layer of W_s is calculated for measured material. Further, power of refracted wave is stabilized by changing power of falling wave, temperature of subject material T₁ is measured, and after given time span - temperature T₂ and moisture level are determined for volume of material from given mathematical relation. Device for realization of given method includes UHF generator, UHF detector, wave-guiding Y-circulator, input shoulder of which has generator block controlled by voltage, attenuator, controlled by central microprocessor unit, UHF watt-meter with output to central microprocessor unit device for controlling and stabilization of output power, diode pulse modulator and video pulse generator, controlled by central microprocessor unit, peak detector. First output shoulder of Y-circulator has absorbing synchronized load, and second output shoulder has complex cone antenna, consisting of emitting portion in form of ring-shaped multi-slit antenna and cone-shaped receipt portion, to which gate is connected as well as second UHF watt-meter, connected to extreme digital controller for searching and indication of power minimum of returned wave and resonator indicator of wave meter. UHF generator is powered by central microprocessor unit controlled power block, video pulse counter is connected to digital wave meter, and thermal pairs block is connected to central microprocessor unit device.

EFFECT: increased sensitivity, increased precision of measurement of moisture load of surface layer, expanded functional capabilities due to additional determination of integral moisture load on basis of interaction volume and decreased parasitic UHF emission.

2 cl, 3 dwg