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Title: Radionuclide calorimeter system

Abstract

A circuit for measuring temperature differentials in a calorimeter is disclosed. The temperature differential between the reference element and sample element containing a radioactive material is measured via a wheatstone bridge arrangement of thermistors. The bridge is driven with an alternating current on a pulsed basis to maintain the thermal floor of the calorimeter at a low reference value. A lock-in amplifier connected to the bridge phase locks a signal from the bridge to the input pulsed AC signal to provide a DC voltage. The DC voltage is sampled over time and provided to a digital computer. The digital computer, using curve fitting algorithms, will derive a function for the sample data. From the function, an equilibrium value for the temperature may be calculated.

Inventors:
 [1];  [2];  [3];  [1]
  1. Denver, CO
  2. Arvada, CO
  3. Boulder, CO
Issue Date:
Research Org.:
ROCKWELL INTERNATIONAL CORP
OSTI Identifier:
868072
Patent Number(s):
5067820
Application Number:
07/540,240
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC04-76DP03533
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
radionuclide; calorimeter; circuit; measuring; temperature; differentials; disclosed; differential; reference; element; sample; containing; radioactive; material; measured; via; wheatstone; bridge; arrangement; thermistors; driven; alternating; current; pulsed; basis; maintain; thermal; floor; value; lock-in; amplifier; connected; phase; locks; signal; input; provide; dc; voltage; sampled; time; provided; digital; computer; curve; fitting; algorithms; derive; function; data; equilibrium; calculated; curve fitting; measuring temperature; radioactive material; active material; alternating current; dc voltage; temperature differential; input pulse; digital computer; bridge arrangement; wheatstone bridge; amplifier connected; lock-in amplifier; measured via; curve fit; temperature differentials; element containing; /374/422/

Citation Formats

Donohoue, Thomas P, Oertel, Christopher P, Tyree, William H, and Valdez, Joe L. Radionuclide calorimeter system. United States: N. p., 1991. Web.
Donohoue, Thomas P, Oertel, Christopher P, Tyree, William H, & Valdez, Joe L. Radionuclide calorimeter system. United States.
Donohoue, Thomas P, Oertel, Christopher P, Tyree, William H, and Valdez, Joe L. Tue . "Radionuclide calorimeter system". United States. https://www.osti.gov/servlets/purl/868072.
@article{osti_868072,
title = {Radionuclide calorimeter system},
author = {Donohoue, Thomas P and Oertel, Christopher P and Tyree, William H and Valdez, Joe L},
abstractNote = {A circuit for measuring temperature differentials in a calorimeter is disclosed. The temperature differential between the reference element and sample element containing a radioactive material is measured via a wheatstone bridge arrangement of thermistors. The bridge is driven with an alternating current on a pulsed basis to maintain the thermal floor of the calorimeter at a low reference value. A lock-in amplifier connected to the bridge phase locks a signal from the bridge to the input pulsed AC signal to provide a DC voltage. The DC voltage is sampled over time and provided to a digital computer. The digital computer, using curve fitting algorithms, will derive a function for the sample data. From the function, an equilibrium value for the temperature may be calculated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {11}
}

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