Browse Prior Art Database

Three Lead Hall Probe

IP.com Disclosure Number: IPCOM000098135D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Kostyshyn, B: AUTHOR

Abstract

The three lead Hall probe is particularly adaptable to sensing magnetic fields which are oriented parallel to the surfaces from which they emanate and is sensitive to extremely small fields having magnitudes as low as 1 or 2 oersteds.

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Three Lead Hall Probe

The three lead Hall probe is particularly adaptable to sensing magnetic fields which are oriented parallel to the surfaces from which they emanate and is sensitive to extremely small fields having magnitudes as low as 1 or 2 oersteds.

The probe 1 comprises a thin layer of semiconductor material on a substrate 2 and is in the shape of a T having a cross arm 3 with a leg 4 at right angles to the arm. A sensitive area 5 at the junction of the arm 3 and leg 4 yields a maximum Hall voltage, when influenced by concurrent and mutually perpendicular electric current and magnetic forces.

Opposite ends of the arm 3 are connected through extensions 6 and 7 and leads 8 and 9 to opposite ends of a potentiometer 10. The latter is connected across a current source 11. The leg 4 is connected through an extension 12, lead 13 and a voltmeter 14 to a potentiometer slide 15.

Typical values of resistance for the probe and potentiometer are 10 ohms and 150 ohms, respectively. The current source should be capable of providing a current through the probe of several milliamperes, when the probe is subjected to the influence of a magnetizing force of below 100 oersteds.

The sensitive area should be brought as close to the leading edge 16 as is physically practicable.

Examples of suitable materials for the probe are bismuth, germanium, indium arsenide, and indium antimonide.

The slider and its connecting line may be considered the equivalent of the fourth lead of a co...