Inductive displacement sensor apparatus

Details Inductive displacement sensor apparatus Inductive displacement sensor apparatus

1974-11-14

1976-08-03

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3300

Patent

active

039731910

ABSTRACT:
A variable inductor having a U-shaped magnetic core with a short-circuiting plate providing a short-circuiting ring for both legs of the core movable along the core legs in response to a displacement to be measured is connected in an electronic circuit to generate oscillation of a frequency that is either directly or inversely proportional to the displacement. For the inversely proportional case, the variable inductance component can be combined with an integrator function and connected to an operational amplifier, for generation of the output frequency with a small number of electrical components. Additional circuit means may be used to improve linearity at higher output frequencies, or to provide arbitrary non-linear displacement-frequency characteristics.

REFERENCES:
patent: 2048591 (1936-07-01), Berry
patent: 3479582 (1969-11-01), Meyer

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