Magnetic sensor having a coil with varying turns along the lengt

Details Magnetic sensor having a coil with varying turns along the lengt Magnetic sensor having a coil with varying turns along the lengt

1996-09-27

1998-10-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 336198, 336221, 336225, G01R 3302, H01F 502, H01F 2728

Patent

active

058182268

ABSTRACT:
A magnetic sensor includes an elongated magnetic core and a coil wound on the periphery of the magnetic core so as to detect a magnetic field based on the change of inductance of the coil with high sensitivity and without increasing the number of turns of the coil. The number of turns of the coil in the central part of the magnetic core is larger than that of the coil at the end parts of the magnetic core. Thus, a bias field due to a bias current supplied to the coil is efficiently applied to the magnetic core. As a result, the inductance of the coil can be set to a large value without increasing the number of turns of the coil and a high sensitivity can be obtained.

REFERENCES:
patent: 2159534 (1939-05-01), Ruska
patent: 2436394 (1948-02-01), Maltby et al.
patent: 2927266 (1960-03-01), Richter
patent: 3546580 (1970-12-01), Williams
patent: 3641587 (1972-02-01), Virsberg
patent: 3784946 (1974-01-01), Bingen et al.
patent: 4388568 (1983-06-01), Goseberg et al.
patent: 4884028 (1989-11-01), Kozlov et al.

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