Thermal measuring and testing – Calorimetry – With control of heat added to or lost from a sample container
Patent
1996-11-19
1998-09-15
Gutierrez, Diego F. F.
Thermal measuring and testing
Calorimetry
With control of heat added to or lost from a sample container
374 33, 374 43, 422 51, G01K 1700, G01N 2520
Patent
active
058069798
ABSTRACT:
Apparatus for measuring heat capacity of a sample where a series of measurements are taken in succession comprises a sample holder in which a sample to be measured is disposed, a temperature sensor and sample heater for providing a heat pulse thermally connected to the sample, and an adiabatic heat shield in which the sample holder is positioned and including an electrical heater. An electrical power supply device provides an electrical power output to the sample heater to generate a heat pulse. The electrical power from a power source to the heat shield heater is adjusted by a control device, if necessary, from one measurement to the next in response to a sample temperature-versus-time change determined before and after a previous heat pulse to provide a subsequent sample temperature-versus-time change that is substantially linear before and after the subsequent heat pulse. A temperature sensor is used and operable over a range of temperatures ranging from approximately 3K to 350K depending upon the refrigerant used. The sample optionally can be subjected to dc magnetic fields such as from 0 to 12 Tesla (0 to 120 kOe).
REFERENCES:
patent: 3267728 (1966-08-01), Solomons
patent: 3365944 (1968-01-01), Hoagland
patent: 3813937 (1974-06-01), Fletcher et al.
patent: 4185497 (1980-01-01), Decker et al.
patent: 4208907 (1980-06-01), Townsend et al.
patent: 4333332 (1982-06-01), Privalov
patent: 4765749 (1988-08-01), Bourgade et al.
patent: 4783174 (1988-11-01), Gmelin et al.
patent: 4892707 (1990-01-01), Stockton et al.
Modern Low-Temperature Calorimetry; Thermochimica Acta, 29 (1979) pp. 1-39; E. Gmelin.
Enthalpy increment measurements from 4.5 . . . Bismuth (cr). Thermodynamic Properties from 0 K to the Melting Point. J. Chem. Eng. Data 1995, 40, pp. 1015-1024; D. G. Archer.
"Tray" Type Calorimeter for the 15-300 K Temperature Range: Copper as a specific Heat Standard in This Range; Rev. Sci. Instrum. 58(4), Apr. 1987, pp. 639-646; D. L. Martin.
Apparatus For Heat Capacity Measurements of Amorphous Metals; J. Phys. E; Sci. Instrum., vol. 18, 1985, pp. 581-583; Lanchester and Mohammed.
Automated Small Sample Calorimeter; pp. 1054-1059, Schwall, Howard and Stewart.
Automatic Calorimetry in the 3-30 K Range. The Specific Heat of Copper; Sci. Instrum., vol. 44, No. 6, Jun. 1973; pp. 675-684; Martin, Bradley, Cazemier and Snowdon.
Cash, W. M. et al., "Application of a digital computer to data acquisition and shield temperature control of a high-temperature, adiabatic calorimeter," Dev. Sci. Instrum. vol. 52, No. 6, pp. 895-901 (Jun. 1981).
Moses, D. et al., "Simple calorimetric system for the temperature range 3-300 k with on-line computer," Dev. Sci. Instrum., vol. 48, No. 8, pp. 1098-1103 (Aug. 1977).
Gschneidner, Jr. Karl A.
Moorman Jack O.
Pecharsky Vitalij K.
Gutierrez Diego F. F.
Iowa State University & Research Foundation, Inc.
Timmer Edward J.
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