Circuit for measuring inductance changes

Details Circuit for measuring inductance changes Circuit for measuring inductance changes

1982-04-14

1984-08-21

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324207, G01R 1152, G01R 2726

Patent

active

044672721

ABSTRACT:
A Schmitt trigger circuit is caused to oscillate by a time-constant circuit including a reference inductor. The changing inductance of a variable inductor, for example, an inductive transducer for measuring mechanical movements, is switched into the same circuit, and the length of pulses resulting is measured in comparison with the stored value of the pulse length produced by the comparison inductor, which needs to be put in circuit only at longer intervals. With two Schmitt trigger circuits, one controlled by the comparison inductor and maintained in oscillation, while the other is controlled by the variable inductor and is triggered in synchronism with the oscillating Schmitt trigger, a pulse having a length representing the difference between the inductances of the comparison and variable inductors can be simply produced at frequent intervals. Several variable inductors can be continually measured with reference to a single comparison inductor.

REFERENCES:
patent: 4384251 (1983-05-01), Schelling

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