Magnetic field measurements near RF induction heaters
作者:
David L. Conover,
William E. Murray,
Joseph M. Lary,
Peggy H. Johnson,
期刊:
Bioelectromagnetics
(WILEY Available online 1986)
卷期:
Volume 7,
issue 1
页码: 83-90
ISSN:0197-8462
年代: 1986
DOI:10.1002/bem.2250070109
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: RF induction heaters;magnetic field strength monitor;occupational RF exposures
数据来源: WILEY
摘要:
AbstractWe 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 A2/m2, 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 A2/m2, 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 A2/m2and 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 A2/m2(without duty factor correction
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