Methods and apparatus for measuring the postion of an edge of a

Details Methods and apparatus for measuring the postion of an edge of a Methods and apparatus for measuring the postion of an edge of a

1992-08-14

1994-08-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420712, 32420718, G01B 700, G01B 714

Patent

active

053390296

ABSTRACT:
In a method for inductively measuring the position of a strip of metal, in which a primary coil fed by an alternating voltage is arranged on one side of a strip edge and a secondary coil is arranged on the other side of the strip edge and a signal reproducing the strip position is derived from the change in coupling at the secondary coil caused by the shielding by the strip, the primary coil is operated at a high frequency of the alternating voltage of at least 10 kHz in order to widen the field of application of the inductive strip position measuring. Non-magnetic coil cores are provided at primary and secondary coil in order to achieve a high natural resonant frequency.

REFERENCES:
patent: 2550736 (1951-05-01), Tricebock
patent: 3205485 (1965-09-01), Noltingk
patent: 3361962 (1968-01-01), Albrecht
patent: 3452343 (1969-06-01), Crank et al.
patent: 4409852 (1983-10-01), Suzuki et al.
patent: 4536709 (1985-08-01), Ishida
patent: 4752739 (1988-06-01), Wang
patent: 4757259 (1988-07-01), Charpentier
patent: 4814734 (1989-03-01), Moran

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