Use of an Operational Amplifier with Helmholtz Coils for Reducing ac Induced Magnetic Fields

1 November 1961

journal article
research article
Published by AIP Publishing in Review of Scientific Instruments

Vol. 32 (11) , 1192-1195
https://doi.org/10.1063/1.1717205

Abstract

A feedback system is described for canceling magnetic fields resulting from alternating currents. The design features of an operational amplifier are offered. In addition the nature of the phase shift contributed by mutual inductance elements in the feedback path is discussed. Magnetic fields with a flux density of one milligauss can be reduced by about two orders of magnitude with the system.

Keywords

OPERATIONAL AMPLIFIER
MAGNETIC FIELD
FEEDBACK SYSTEM
PHASE SHIFT

This publication has 2 references indexed in Scilit:

Compensation of the Earth's Magnetic Field
Review of Scientific Instruments, 1957
Analysis of Problems in Dynamics by Electronic Circuits
Proceedings of the IRE, 1947