Inductive proximity sensor for detecting ferrous and non-ferrous

Details Inductive proximity sensor for detecting ferrous and non-ferrous Inductive proximity sensor for detecting ferrous and non-ferrous

1995-03-03

1996-05-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324327, 324334, 331 65, G01N 2700, G01V 310, H03K 1795

Patent

active

055193170

ABSTRACT:
An inductive proximity sensor has a resonant circuit including a sensing coil and driven by an oscillator at a predetermined frequency. To sense selectively ferrous and non-ferrous objects, the excitation frequency is a subcritical excitation frequency and discriminator logic is provided to process a phase-shift signal and a damping signal.

REFERENCES:
patent: 3201774 (1965-08-01), Uemura
patent: 3826973 (1974-07-01), Pflaum
patent: 3896371 (1975-07-01), Hametta
patent: 4473799 (1984-09-01), Favre
patent: 4879531 (1989-11-01), Tigges et al.

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