Coil and Hall device circuit for sensing magnetic fields

Details Coil and Hall device circuit for sensing magnetic fields Coil and Hall device circuit for sensing magnetic fields

1988-10-25

1990-07-31

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

307309, 324235, 324240, 324251, 324258, 338 32H, G01N 2783, G01R 3306

Patent

active

049453068

ABSTRACT:
Relatively minute changes in magnetic field intensity are sensed by a circuit including a wire coil connected to a Hall effect element to provide the bias current to the element. The Hall effect element is disposed in the magnetic field with the coil and the output signal of the element is proportional to the square of the intensity of the magnetic field. The circuit is included in a device for measuring magnetic anomalies such as stress or corrosion cracks in structures of magnetic material including fluid transmission pipelines.

REFERENCES:
patent: 2814015 (1957-11-01), Kuhrt
patent: 3195043 (1965-07-01), Burig et al.
patent: 4468619 (1984-08-01), Reeves
patent: 4789827 (1988-12-01), Bergander

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