Thermal measuring and testing – Thermal testing of a nonthermal quantity – With loading of specimen
Patent
1998-06-25
2000-11-14
Bennett, G. Bradley
Thermal measuring and testing
Thermal testing of a nonthermal quantity
With loading of specimen
374 10, G01N 2500, G01N 300
Patent
active
061460133
ABSTRACT:
A method and apparatus for performing combined single differential thermal analysis and dynamic mechanical analysis of a sample relative to a reference, using either one reference measurement for a sequence of material measurements--whereby the reference can also be represented by an empty weighing pan--or by the use of a mathematical model which is so determined that it takes the real behavior of the thermal analytical apparatus into account. Reference temperature curves are generated relative to time of an empty furnace or a reference sample contained in the furnace, and temperature curves of a sample to be measured are taken at the exact same location in the furnace. The reference and sample temperature curves are compared to determine the temperature difference. The reference temperature curve can be calculated mathematically from the measured furnace temperature and the heat transmission factor between the furnace temperature and the temperature of the location of the sample in the furnace, whereby it is possible to determine the differential thermal analysis by a single measurement. The single differential thermal analysis signal is then combined with a dynamic mechanical analysis signal, thereby to determine the physical properties of the sample with great precision.
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Thermal Analysis, by Berhard Wunderlich, Academic Press, pp. 350-357, (No Date).
Huetter Thomas
Joerimann Urs
Wiedemann Hans-Georg
Bennett G. Bradley
Mettler-Toledo GmbH
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