METHOD TO DETERMINE COEFFICIENT OF MOISTURE CONDUCTION OF SHEET ORTHOTROPIC CAPILLARY-POROUS MATERIALS Russian patent published in 2013 - IPC G01N15/08 

FIELD: measurement equipment.

SUBSTANCE: method to determine coefficient of moisture conduction of sheet orthotropic capillary-porous materials includes creation of even initial moisture content in the investigated item, impulse contact of the investigated sample with the moisture source, measurement of time variation of a signal of a galvanic converter, determination of time for achievement of maximum on the curve of EMF variation of the galvanic converter and calculation of the coefficient of moisture conduction. At the same time impulse moistening of the investigated item is carried out along the straight line with the movable source of moisture of continuous efficiency in the specified direction of the orthotrpic material, electrodes of the galvanic converter are made in the form of rectilinear sections, and they are arranged at both sides of the line of impulse moistening on straight parallel lines of impulse moistening, arranged on the identical specified distance from it. Then the sought-for coefficient is calculated in accordance with the formula: $$D=x_0^2/\left(2{\tau }_{\max }\right),$$ where τ_max - time of achievement of maximum on the curve of EMF variation of the galvanic converter; X₀ - distance between the line of impulse moistening and distance to the lines of location of electrodes of the galvanic converter.

EFFECT: increased accuracy of control and provision of the possibility to determine coefficients of moisture conduction in various directions of an orthotropic sheet material.