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Magnetic field measurements near RF induction heaters
Author(s) -
Conover David L.,
Murray William E.,
Lary Joseph M.,
Johnson Peggy H.
Publication year - 1986
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.2250070109
Subject(s) - electromagnetic induction , bioelectromagnetics , magnetic field , radio frequency , induction heating , electrical engineering , nuclear magnetic resonance , nuclear engineering , materials science , engineering , physics , electromagnetic coil , quantum mechanics
We discuss initial magnetic field strength measurements made around radiofrequency (RF) induction heaters. These measurements were made with a monitor developed for the National Institute for Occupational Safety and Health (NIOSH) by the National Bureau of Standards (NBS). The monitor has a dynamic range of .01 to 10,000 A 2 /m 2 , a frequency range of 300 kHz to 100 MHz, an isotropic response (± .3 dB) with three mutally orthogonal loop antennas that have the ability to measure and display each of three orthogonal magnetic field components, a high probe burnout protection level of 20,000 A 2 /m 2 , and an accuracy of ± 1.0 dB at 13 calibration frequencies. The portable survey monitor was used to measure the magnetic field strengths in the vicinity of 16 RF induction heaters. Typically these induction heaters are operated continuously for several hours. The maximum field strengths (without duty factor correction) ranged from 15 to 4,500 A 2 /m 2 and were measured 5 to 51 cm from the loop applicators of the induction heaters. At locations commonly occupied by workers (ie, approximately 30 to 76 cm from heaters), the fields ranged from .01 to 300 A 2 /m 2 (without duty factor correction).