Radionuclide calorimeter system
Patent
·
OSTI ID:868072
- Denver, CO
- Arvada, CO
- Boulder, CO
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.
- Research Organization:
- ROCKWELL INTERNATIONAL CORP
- DOE Contract Number:
- AC04-76DP03533
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 5067820
- Application Number:
- 07/540,240
- OSTI ID:
- 868072
- Country of Publication:
- United States
- Language:
- English
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active material
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alternating
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active material
algorithms
alternating
alternating current
amplifier
amplifier connected
arrangement
basis
bridge
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calorimeter
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connected
containing
current
curve
curve fit
curve fitting
data
dc
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differential
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digital
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element
element containing
equilibrium
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floor
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input
input pulse
lock-in
lock-in amplifier
locks
maintain
material
measured
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measuring
measuring temperature
phase
provide
provided
pulsed
radioactive
radioactive material
radionuclide
reference
sample
sampled
signal
temperature
temperature differential
temperature differentials
thermal
thermistors
time
value
via
voltage
wheatstone
wheatstone bridge