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Title: Calorimetric system and method

Abstract

Apparatus is described 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). 18 figs.

Inventors:
; ;
Issue Date:
Research Org.:
Iowa State University
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
672646
Patent Number(s):
5,806,979
Application Number:
PAN: 8-753,036
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; SCA: 400102; PA: EDB-98:120295; SN: 98002026841
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 15 Sep 1998
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; CALORIMETERS; SAMPLE HOLDERS; SPECIFIC HEAT; POWER SUPPLIES; TEMPERATURE MEASUREMENT; REFRIGERANTS; MAGNETIC FIELDS; CALORIMETRY

Citation Formats

Gschneidner, K.A. Jr., Pecharsky, V.K., and Moorman, J.O. Calorimetric system and method. United States: N. p., 1998. Web.
Gschneidner, K.A. Jr., Pecharsky, V.K., & Moorman, J.O. Calorimetric system and method. United States.
Gschneidner, K.A. Jr., Pecharsky, V.K., and Moorman, J.O. Tue . "Calorimetric system and method". United States.
@article{osti_672646,
title = {Calorimetric system and method},
author = {Gschneidner, K.A. Jr. and Pecharsky, V.K. and Moorman, J.O.},
abstractNote = {Apparatus is described 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). 18 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}