Title :
An Accurate Probe for Mapping Strong HF Magnetic Fields
Author :
Oleson, James R.
Author_Institution :
Division of Radiation Oncology, Arizona Health Sciences Center, University of Arizona
Abstract :
Design, calibration, and performance of an HF magnetic field probe based on photoammeter principles are discussed. The probe is minimally field perturbing, measures an average value of magnetic field over a 2 cm2 area, has precision to ±1 percent of full scale values, and has an accuracy of ±5 percent. The probe can measure orthogonal components of a field, and in that sense is a vector probe. Relative phases of orthogonal field components are not measured, however. The probe is useful in measuring and mapping relatively intense magnetic fields of known frequency (e.g., 80 A/m at 13.56 MHz) such as those used in hyperthermia for cancer treatment with magnetic induction techniques. Accurate magnetic field measurements permit a determination of the absorbed power densities that result in tissue heating.
Keywords :
Area measurement; Calibration; Cancer; Frequency measurement; Hafnium; Hyperthermia; Magnetic field measurement; Magnetic fields; Phase measurement; Probes; Electromagnetic Fields; Electronics, Medical;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1982.324988