Radionuclide calorimeter system

Details Radionuclide calorimeter system Radionuclide calorimeter system

1990-06-19

1991-11-26

Cuchlinski, Jr., William A,.

Thermal measuring and testing

Calorimetry

422 51, 374 10, G01K 1708

Patent

active

050678205

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.

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