METHOD OF COMPLEX DETERMINING OF THERMOPHYSICAL PROPERTIES OF MATERIALS Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: method involves the steps of: measuring a thickness of a specimen to be investigated, driving it into thermal contact over the surface of reference specimen, thermostatting the two specimens at an initial predetermined temperature, continuously supplying heat to the plane inside the reference specimen located at a predetermined distance in parallel with the contact plane, with temperatures on outer surfaces of the specimen investigated and the reference one being maintained equal to the predetermined initial thermostatting temperature; measuring specific power of a heat source and temperature of the reference specimen in a predetermined cross-section; additionally measuring a temperature of the reference specimen in a heat-supplying plane with variable-in-time step such that a time moment when temperature is to be measured at a subsequent step is determined as a product of a positive constant strictly greater than 1 by a time moment value when temperature is measured at the previous step; checking at each step a dynamic parameter presenting a ratio of temperature of the reference speciment at a measurement step the number of which is less than the number of the last measurement step by a constant integer to temperature of the reference specimen at the last measurement step; comparing the dynamic parameter value with a predetermined maximum value within the range of 0.55-0.84; terminating the tests at exceeding the predetermined dynamic parameter maximum value and determining thermophysical properties of interest. EFFECT: enhanced accuracy. 3 dwg