Differential calorimeter based on the heat leak principle

Details Differential calorimeter based on the heat leak principle Differential calorimeter based on the heat leak principle

1978-10-17

1981-03-17

Goldstein, Herbert

Measuring and testing

Gas content of a liquid or a solid

By vibration

73190R, G01K 1700

Patent

active

042559618

ABSTRACT:
A differential scanning calorimeter based on the heat leak principle having a reference measuring cell and a sample measuring cell symmetrically seated within a copper heat sink surrounded by an isothermal shield. Each measuring cell includes a cylindrical stainless steel ampoule which contains a test substance, a honeycombed aluminum cell frame which supports the ampoule, and a pair of thermopiles which are placed between the aluminum cell frame and the copper heat sink and which measure the temperature difference between the two. A plurality of resistive heating elements wired in series are applied to different sections of the heat sink and the isothermal shield, each heating element having a resistance respectively proportional to the heat capacity of the heat sink sections and the shield. A common current is then passed through the heating elements, thus producing a highly uniform positive temperature scan with a minimum of residual temperature gradients existing within the heat sink. The ampoules in the measuring cells are individually pressurizable whereby calorimetric data as a function of pressure can be obtained.

REFERENCES:
patent: 3059471 (1962-10-01), Calvet
patent: 3263484 (1966-08-01), Watson et al.
patent: 3283560 (1966-11-01), Harden et al.
patent: 3373607 (1968-03-01), Schoenlaub
patent: 3572084 (1971-03-01), May
patent: 4149401 (1979-04-01), Hentze

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