Constant flux magneto resistive magnetic reluctance sensing appa

Details Constant flux magneto resistive magnetic reluctance sensing appa Constant flux magneto resistive magnetic reluctance sensing appa

1985-03-14

1987-05-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

235449, 324208, 324252, 360113, G06K 708, G01N 2772, G01R 3306, G01B 730

Patent

active

046689133

ABSTRACT:
Disclosed is an improved method and apparatus for sensing magnetic reluctance variations. The invention may be used for magnetic ink character reading, such as is employed on bank checks, or for any of a variety of magnetic reluctance pickup applications. An improved magnetic reluctance sensor head utilizes an essentially U or C-shaped magnetically permeable member having a magnetizing coil encircling it. The coil is arranged to deliver essentially a constant magnetic flux to the U or C-shaped member. The tips of the U or C are placed adjacent to the element whose variation of reluctance is to be detected and a magneto resistive or other similar magnetic sensor is connected in the magnetic circuit either in parallel or in series with the variable reluctance which is to be sensed.

REFERENCES:
patent: 3337795 (1967-08-01), Yamamoto et al.
patent: 3340467 (1967-09-01), Ha
patent: 3444458 (1969-05-01), Scott
patent: 4021728 (1977-05-01), Makino et al.
patent: 4122505 (1978-10-01), Kuijk
patent: 4229696 (1980-10-01), Gustafson
patent: 4400752 (1983-08-01), Chabrolle
patent: 4566050 (1986-01-01), Beam et al.

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