Radionuclide calorimeter system
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. 7 figures.
- DOE Contract Number:
- AC04-76DP03533
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5067820; A
- Application Number:
- PPN: US 7-540240
- OSTI ID:
- 7274801
- Resource Relation:
- Patent File Date: 19 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CALORIMETRY
DATA ACQUISITION
ELECTRONIC CIRCUITS
DESIGN
RADIOACTIVE MATERIALS
OPERATION
TEMPERATURE GRADIENTS
MATERIALS
440500* - Thermal Instrumentation- (1990-)
400702 - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials