NONDESTRUCTIVE CONTROL METHOD FOR THERMAL AND PHYSICAL PROPERTIES OF BUILDING MATERIALS FOR MULTILAYER BUILDING STRUCTURE ERECTION Russian patent published in 2005 - IPC

FIELD: building, particularly for investigating or analyzing materials.

SUBSTANCE: method involves performing adiabatic thermal action on surface of outer structure layer with the use of disc heater arranged in plane of test probe surrounded by protective heat-insulation ring; recording time dependence of investigated material surface temperature; arranging heat flow sensor on contact surface of the second probe instead of disc heater; installing two linear heaters at a distance from disc heater of the first probe and two linear heaters at a distance from heat flow sensor of the second probe; arranging thermoelectric batteries at fixed distance from linear heaters along line parallel to line of heaters location; applying single heat impulse from linear heat sources to outer structure layers to determine heat and physical properties thereof; determining time of temperature field relaxation in controlled points; performing action of heat pulses in both probes from linear heat sources; changing heat pulse frequency up to obtain temperature in points spaced the same distances from linear heaters equal to two pre-determined values along with determining frequencies of heat pulses for the first and the second outer layers correspondingly; determining heat and physical properties of outer structure layers with the use of above information and obtained mathematical relations; performing heat action on inner structure layer with the use of disc heater of the first probe to define heat and physical properties of inner layer; recording heat flux value by sensor arranged on contact surface of the second probe; measuring temperature in points located correspondingly under disc heater and on contact surface of heat flux sensor with the use of pre-measured temperatures in above points, pre-measured value of heat flux passing through structure layers and previously obtained values of heat and physical properties of outer structure layers; determining heat and physical properties of inner structure layer on the base of mathematical relations describing temperature drop in each of three layers.

EFFECT: increased accuracy of heat and physical properties determination in multi-layer articles.

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