Differential reluctance motion detector

Details Differential reluctance motion detector Differential reluctance motion detector

1977-02-22

1978-04-11

Gill, James J.

Measuring and testing

Volumetric content measuring

73497, 340199, G01L 500

Patent

active

040832376

ABSTRACT:
A displacement detector yielding an electrical output signal that is linearly proportional to the extent of input motion. The input motion to be monitored is applied to the shiftable armature of a differential reluctance transducer constituted by a pair of transformers, each having a primary, a main secondary and an auxiliary secondary. Fed to the primaries is a high-frequency drive voltage generated by an oscillator whose amplitude is regulated by a feedback loop in which a feedback voltage taken from the auxiliary secondaries is compared with a reference voltage to provide a control voltage that so regulates the drive voltage oscillator as to cancel out the effect of temperature on the output signal derived from the main secondaries.

REFERENCES:
patent: 3185973 (1965-05-01), Garber
patent: 3225289 (1965-12-01), Koppel et al.
patent: 3456132 (1969-07-01), Dechelotte
patent: 3555405 (1971-01-01), Martin

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