G - Physics – 01 – L
Patent
G - Physics
01
L
340/106, 340/145
G01L 19/04 (2006.01) G01L 9/10 (2006.01)
Patent
CA 1150525
-10- TEMPERATURE COMPENSATION FOR TRANSDUCER COMPONENTS ABSTRACT OF THE DISCLOSURE A circuit for compensating the temperature dependence of the deformation properties of a pressure transducer sensor, having four basic parts: a current source having an output proportional to the sensor temperature, a constant voltage source, a Norton divider, and an operational amplifier. One branch of the Norton Divider is a vari- able conductance ladder having an output current which increases at a programmed rate as the current from the temperature dependent source increases. The programmed rate is based on the temperature-dependent characteristic of the transducer sensor. The two branches of the Nor- ton divider are connected as inputs to the operational amplifier. The operational amplifier provides the output of the compensating circuit, which is the difference between the reference voltage of the voltage source and the voltage at the output of the variable conductance lad- der. As the current source increases, the output voltage of the am- plifier is reduced such that the temperature dependence of the output voltage is a close approximation to the inverse of the temperature dependence of the sensor deformation characteristic.
381578
Abb Combustion Engineering Nuclear Power Inc.
Smart & Biggar
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