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Calorimetric system and method

Patent ·
OSTI ID:871837
 [1];  [2]
  1. Ames, IA
  2. Boone, IA
+ Show Author Affiliations

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).

Research Organization:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
DOE Contract Number:
W-7405-ENG-82
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Number(s):
US 5806979
Application Number:
08/753,036
OSTI ID:
871837
Country of Publication:
United States
Language:
English

References (8)

Application of a digital computer to data acquisition and shield temperature control of a high‐temperature, adiabatic calorimeter journal June 1981
Automated small sample calorimeter journal August 1975
Simple calorimetric system for the temperature range 3–300 K with on‐line computer journal August 1977
‘‘Tray’’ type calorimeter for the 15–300 K temperature range: Copper as a specific heat standard in this range journal April 1987
Apparatus for heat capacity measurements of amorphous metals journal July 1985
Enthalpy Increment Measurements from 4.5 to 318 K for Bismuth(cr). Thermodynamic Properties from 0 K to the Melting Point journal July 1995
Modern low-temperature calorimetry journal March 1979
Automatic Calorimetry in the 3–30 K Range. The Specific Heat of Copper journal June 1973

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