FIELD: measurement technology.
SUBSTANCE: invention can be used in practice of thermophysical measurements, in construction heat engineering and various industries. Essence of the invention consists in heating the analyzed object by the action of a pulse of microwave radiation focused in a line of specified dimensions with a lens from radiotransparent dielectric material, measurement of excess temperature on the surface of the analyzed object, which is insulated from the environment, at two points located at given distances x1 and x2 from the electromagnetic action line and determining the desired thermophysical characteristics from the obtained mathematical relationships. Surface of analyzed object is exposed to electromagnetic field of microwave range with frequency of not less than 20 GHz, at that, at the beginning, single thermal pulse is applied to power, which is set by time of supply of electromagnetic field of microwave radiation of specified frequency. Method then includes determining a relaxation time interval from the beginning of the thermal action to a point in time when the temperature at the control point x1 becomes equal to initial temperature. Then, the minimum frequency of supply of UHF radiation pulses to the analyzed object is determined. Further, the analyzed object is exposed to pulses of specified power, increasing the frequency of their supply until the steady-state value of the controlled temperature at the point x1 becomes equal to a predetermined value. Pulse repetition rate is determined, wherein the measured excess temperature at the control point x2 is also measured on the surface of the analyzed object, and the desired thermophysical characteristics are determined from the obtained mathematical relationships.
EFFECT: high accuracy of determining unknown thermophysical characteristics of construction materials and articles.
1 cl, 3 dwg, 3 tbl
