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Pulsing Circuit For Hall Probe

IP.com Disclosure Number: IPCOM000098134D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Lyon, RL: AUTHOR

Abstract

The Hall type probe 1 in the upper drawing is connected as shown in the lower drawing so that a pulsating current at low duty cycles is applied and provides increased Hall output voltage without effecting any change in the stability of the probe.

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Pulsing Circuit For Hall Probe

The Hall type probe 1 in the upper drawing is connected as shown in the lower drawing so that a pulsating current at low duty cycles is applied and provides increased Hall output voltage without effecting any change in the stability of the probe.

The probe has a cross shaped configuration of intersecting arms 2 and 3 consisting of a thin layer of semiconductor material secured to a substrate 4. Current applied to extensions 5 and 6 of arm 2 produce a Hall voltage across the extensions 7 and 8 of arm 3, while the sensitive area where the arms cross is subjected to the influence of a magnetic field.

Lines 9 and 10 connect extensions 5 and 6, as well as a balancing network 11, with a current pulse driver 12. Lines 13 and 14 connect extensions 7 and 8 with the balancing network 11. The network 11 functions to eliminate an initial voltage across the probe terminals due to geometrical errors in the misalignment of the intersecting arms and is connected to an amplifier 15. The voltages developed across the probe are observed on a scope 16. Pulsating current signals are supplied to the driver 12 by a clock 17. Employment of a pulsating current increases the Hall output voltage by a factor of one hundred and enhances the sensitivity of the probe.

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