Inductive sensor responsive to the distance to a conductive or m

Details Inductive sensor responsive to the distance to a conductive or m Inductive sensor responsive to the distance to a conductive or m

1994-05-24

1996-04-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420726, 324236, 324327, 331 65, G01V 311, G01B 714, H03B 508

Patent

active

055044255

ABSTRACT:
In order to improve a sensor for detecting an electrically conductive or netizable object with an oscillator comprising a resonant circuit including an inductance and a capacitance, the resonant circuit impedance depending on a damping distance between the inductance and the object and rising steeply in the range of small damping distances, further rising less steeply in the range of medium damping distances and substantially having a constant value in the range of large damping distances, and a closed adaptive loop stage supplying a loop current for the resonant circuit and generating a course of an amplitude value dependent on the damping distance, and an evaluation circuit detecting an oscillator voltage applied to the resonant circuit, such that the oscillator also oscillates in the range of small damping distances and has a characteristic curve, with which the oscillator voltage varies with the damping distance also in the range of small damping distances, it is suggested that the course of the amplitude value of the loop current in the range of small damping distances has at least one oscillation-maintaining segment, the gradient of which is smaller than the gradient of the course of the amplitude value in the range of medium damping distances.

REFERENCES:
patent: 4001718 (1977-01-01), Wilson et al.
patent: 4609882 (1986-09-01), Gehring et al.
patent: 4613830 (1986-09-01), Kamiya et al.
patent: 4644298 (1987-02-01), Kamiya et al.
patent: 4803444 (1989-02-01), Takahashi
patent: 4968953 (1990-11-01), Kanda et al.

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