Variable inductance displacement measuring device with slidable

Details Variable inductance displacement measuring device with slidable Variable inductance displacement measuring device with slidable

1989-06-26

1991-04-23

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 324234, 336 45, 336175, 336212, 34087035, G01B 714, G08C 1908, H01F 2724

Patent

active

050102982

ABSTRACT:
A displacement measuring apparatus including a variable inductance coil formed of a pair of coils, on a core of predetermined length made of a material having high magnetic permeability. The pair of coils are disposed on a core adjacent to each other in their axial directions and are covered by a metal sleeve of substantially the same length of one of the coils. A detecting circuit is provided including a high frequency oscillator and a rectifier and is connected to the variable inductance coil, wherein when the metal sleeve is slidably moved, the detecting circuit generates a direct current voltage in correspondence with the displacement of the metal sleeve.

REFERENCES:
patent: 3491289 (1970-01-01), Petrini
patent: 3614694 (1971-10-01), Koontz
patent: 3654549 (1972-04-01), Maurer et al.
patent: 3891918 (1975-06-01), Ellis
patent: 3946300 (1976-03-01), Landis
patent: 4406999 (1983-09-01), Ward
patent: 4629983 (1986-12-01), Boomgaard et al.

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