Thermal analysis instrument

Details Thermal analysis instrument Thermal analysis instrument

1994-09-23

1997-02-04

Gutierrez, Diego F. F.

Thermal measuring and testing

Differential thermal analysis

Detail of sample holder or support therefor

374 11, G01N 2500, G01N 2520

Patent

active

055991041

ABSTRACT:
The temperature of a heat reservoir is varied according to a linear function which is AC modulated. At this time, the temperature difference between two points located in a heat flow path going from the heat reservoir to an unknown sample is measured. Also, the temperature difference between two points located in a heat flow path going from the heat reservoir to a reference sample is measured. These two pairs of points are arranged symmetrically. Then, the resulting signals are demodulated, and each signal is divided into an AC component and a low-frequency component. Using these signals, the DSC signal is separated into a heat capacity component and a latent heat component.

REFERENCES:
patent: 3238775 (1966-03-01), Watts
patent: 3537294 (1970-11-01), Stone
patent: 4095453 (1978-06-01), Woo
patent: 5098196 (1992-03-01), O'Neill
patent: 5211477 (1993-05-01), Li
patent: 5224775 (1993-07-01), Reading et al.
JJGM van Bokhoven, et al., "Fourier analysis for correction of thermograms obtained with a heat flow microcalorimeter of high stability", Journal of physics E scientific instruments, vol. 9 No. 2, Feb. 1976.

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