Strain gauge transducer apparatus

Details Strain gauge transducer apparatus Strain gauge transducer apparatus

1975-09-29

1976-05-18

Ruehl, Charles A.

Measuring and testing

Ductility or brittleness

73398AR, G01L 904

Patent

active

039569276

ABSTRACT:
Strain gauge transducer apparatus including circuitry for balancing current through a pair of strain sensitive semiconductor resistors is disclosed. A current source supplies constant electric current to a voltage divider and a first strain sensitive resistor which are connected to noninverting and inverting input terminals respectively of an operational amplifier. A second strain sensitive resistor is connected between the output and inverting input terminals of the amplifier to provide a feedback signal which balances the current through the strain sensitive resistors. Temperature compensation may be provided by forming the voltage divider of resistors having temperature coefficients matching those of the strain sensitive resistors, or by means of a temperature sensitive resistor in parallel with voltage divider.

REFERENCES:
patent: 3572109 (1971-03-01), Yerman
patent: 3841150 (1974-10-01), Pearson

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