Eddy current type sensor for detecting conductor

Details Eddy current type sensor for detecting conductor Eddy current type sensor for detecting conductor

2007-02-28

2009-11-03

Assouad, Patrick J (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207120, C324S207160

Reexamination Certificate

active

07612557

ABSTRACT:
An eddy current type sensor for detecting a conductor includes a LC circuit and an oscillator. The LC circuit has a coil and a capacitor connected in parallel with the coil. The oscillator supplies an alternating current of a predetermined oscillation frequency to the LC circuit. A signal voltage outputted from the LC circuit has a first voltage when the distance between the coil and the conductor is minimum and a second voltage when the distance between the coil and the conductor is maximum. A voltage difference between the first and second voltages has a first difference at a first temperature and has a second difference at a second temperature. The first and second differences become equal to each other at a first frequency and a second frequency. The oscillation frequency is set close to the first frequency or the second frequency.

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patent: 2003-240788 (2003-08-01), None

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