Patent ID: 6239415
Filing Date: 2001-05-29
Classification: G01N

Abstract:
Thermal analysis process for investigation of thermal phase transformations, wherein a sample (2) and a reference substance (1) are placed into a furnace (3) with rising temperature of a predetermined rate operated by a programmed temperature controller (4), the temperatures of sample (2) and reference substance (1) are sensed by temperature sensors (5, 6); the difference between the temperatures (T.sub.s ', T.sub.r ') of the sample (2) and reference substance (1) is determined by a temperature difference measuring device (9) having an output signal (Q-DTA.sub.t) which is proportional to the temperature difference between the temperature (T.sub.s ') of the sample (2) and the temperature (T.sub.r ') of the reference substance (1) said signal (Q-DTA.sub.t) is generated by the known quasi-static heating technique, wherein said temperature difference is automatically controlled continuously so that said thermal phase transformation of the sample takes place at a constant rate, characterised in that said output signal (Q-DTA.sub.t) which is a function of time t, is integrated with respect to time by an integrating unit (18); and in that said output signal (.intg.Q-DTA.sub.t) of said integrating unit (18) is further transformed into a signal (.intg.Q-DTA.sub.T ) dependent on the temperature T.sub.s ' of the sample.