METHOD OF MEASURING THERMAL DIFFUSIVITY OF HEAT-INSULATING MATERIALS BY REGULAR THIRD KIND MODE TECHNIQUE Russian patent published in 2013 - IPC G01N25/18 

FIELD: physics.

SUBSTANCE: two temperature sensors, made in form of thermocouples or resistance thermometers, are placed in a prepared flat sample of the analysed material in sections with coordinates x=x₁ and x=x₂. The sample, whose top is heat insulated, is placed on the surface of a Peltier element which is a source of harmonic temperature oscillations. By varying the period τ₀ of the harmonic oscillations of the Peltier element, an operating mode of the measuring devices is selected, at which the value differs by not more than a small value ε=0.002…0.009 from a given value ψ_v from the range (0.14…0.18), which enables to calculate the unknown value of thermal diffusivity with the least error.

EFFECT: high accuracy of measuring thermal diffusivity of heat-insulating materials.

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