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Title: Calorimetric system and method

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).

Inventors:
 [1];  [2];  [3]
  1. (Ames, IA)
  2. Ames, IA
  3. Boone, IA
Issue Date:
Research Org.:
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
OSTI Identifier:
871837
Patent Number(s):
5806979
Application Number:
08/753,036
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01K - MEASURING TEMPERATURE
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
calorimetric; method; apparatus; measuring; heat; capacity; sample; series; measurements; succession; comprises; holder; measured; disposed; temperature; sensor; heater; providing; pulse; thermally; connected; adiabatic; shield; positioned; including; electrical; power; supply; device; provides; output; generate; source; adjusted; control; measurement; response; temperature-versus-time; change; determined; previous; provide; subsequent; substantially; linear; operable; range; temperatures; ranging; approximately; 3k; 350k; depending; refrigerant; optionally; subjected; dc; magnetic; fields; 12; tesla; 120; koe; substantially linear; subsequent heat; heat capacity; measuring heat; heat pulse; device provides; sample holder; power output; control device; power source; electrical power; magnetic field; magnetic fields; power supply; temperature sensor; temperatures ranging; heat shield; thermally connected; electrical heat; dc magnet; pulse thermal; /374/422/

Citation Formats

Gschneidner, Jr., Karl A., Pecharsky, Vitalij K, and Moorman, Jack O. Calorimetric system and method. United States: N. p., 1998. Web.
Gschneidner, Jr., Karl A., Pecharsky, Vitalij K, & Moorman, Jack O. Calorimetric system and method. United States.
Gschneidner, Jr., Karl A., Pecharsky, Vitalij K, and Moorman, Jack O. Tue . "Calorimetric system and method". United States. https://www.osti.gov/servlets/purl/871837.
@article{osti_871837,
title = {Calorimetric system and method},
author = {Gschneidner, Jr., Karl A. and Pecharsky, Vitalij K and Moorman, Jack O},
abstractNote = {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).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}

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