Measuring and testing – Volume or rate of flow – System
Patent
1977-03-23
1978-02-07
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
23230R, 23253R, G01K 1700
Patent
active
040720500
ABSTRACT:
A calorimeter includes an adiabatic enclosure surrounding a tube for supporting a sample. In the enclosure is a control chamber in thermal contact with the sample-carrier tube and containing a substantially perfect gas. The temperature of the sample is kept constant during a change of state by varying the pressure of this gas. A differential gas thermometer provides an indication of the difference between the temperature of the sample and that of a thermally insulated reference body which is initially at the same temperature as the sample. An automatic control system varies the pressure of the gas in the control chamber in the sense which tends to cancel any temperature variations detected by the differential gas thermometer. The gas pressure is varied by means of a vertical passage which has its upper end connected to the control chamber and its lower end connected to receive hydraulic liquid from a volumetric pump actuated by the control system. The cross-section of the vertical passage decreases towards the top in such a way that the level of the liquid in the passage is in substantially linear relationship to the pressure of the gas. The quantity of thermal energy given out or taken up by the sample during the change of state is determined by measuring the variation in the pressure of the gas in the control chamber. The reference body is located coaxially around the sample-carrier tube and is coaxially surrounded by a cylindrical baffle at a thermostatically controlled temperature. The adiabatic enclosure is evacuated, and has reflective inside walls.
REFERENCES:
aven, et al., "Adiabatic Specific Heat Calorimeter for the Temperature Range 4.degree. to 15.degree. K.," in Review of Scientific Instruments, vol. 27, No. 8, 8/56 pp. 623-628.
Agence Nationale de Valorisation de la Recherche (ANVAR)
Goldstein Herbert
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