Precision bridge circuit using a temperature sensor

Details Precision bridge circuit using a temperature sensor Precision bridge circuit using a temperature sensor

1990-10-24

1992-10-27

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324706, 324720, 324725, 324101, 307491, G01R 2702

Patent

active

051592770

ABSTRACT:
A precision bridge measurement circuit connected to a current source providing a linear output voltage versus resistance change of a variable resistance (resistance temperature transducer) including a voltage follower in one branch of the bridge so that the zero setting of the transducer resistance does not depend upon the current source or upon an excitation voltage. The zero setting depends only on the precision and stability of the three resistances. By connecting the output of an instrumentation amplifier to a feedback resistor and then to the output of the voltage follower, minor nonlinearities in the resistance-vs-temperature output of a resistance-temperature transducer, such as a platinum temperature sensor, may be corrected. Sensors which have nonlinearity opposite in polarity to platinum, such as nickel-iron sensors, may be linearized by inserting an inverting amplifier into the feedback loop.

REFERENCES:
patent: 3568044 (1971-03-01), Elazar
patent: 4169243 (1979-09-01), Payne et al.
patent: 4229692 (1980-10-01), Graeme
patent: 4717811 (1988-01-01), Fujii
patent: 5030849 (1991-07-01), Brokaw

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