An Adjustable Extremely Low Frequency Electromagnetic Field Generator

  • Mohammad Mehdi Movahedi - Ionizing and Non-Ionizing Radiation Protection Research Center, Paramedical Sciences School, Shiraz University of MedicalSciences, Shiraz, Iran AND Department of Medical Physics and Biomedical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
  • Mehdi Hatam Department of Communications and Electronics Engineering, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran.
  • Hossein Parsaei Department of Medical Physics and Biomedical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
  • Ali Tavakoli-Golpaygani Mail Faculty of Electrical, Mechanical and Construction Engineering, Standard Research Institute, Karaj, Iran.
Keywords:
Electromagnetic, Electromagnetic field, Electromagnetic field generator, Extremely low-frequency, Electromagnetic fields

Abstract

Purpose: The risk effect of long-term occupational exposure to extremely low- frequency electromagnetic fields (ELF-EMFs) has been studied extensively. However, due to several experimental issues such as exposure measurement error and the lack of standard ELF-EMFs exposing devices, the obtained results are controversial. The inconsistent reported results preclude clear conclusions on the evidence of an association between EMF exposure and the disorders reported. To assist with resolving these issues, a digital–low cost ELF-EMFs generator to produce EMFs with desired magnitude and frequency is proposed.
Methods: A sinusoidal waveform with adjustable amplitude and frequency controlled by a microprocessor is generated and then is applied to a coil with a U-shape core. To increase the accuracy of the instrument, three coils with 250 turns; 500 turns; and 1200 turns were designed and used in the instrument. The amplitude and frequency of the voltage delivered to each of these coil are controlled by turning off and on TRIAC transistors controlled by a microprocessor–based system.
Results: The designed instrument provided EMF with magnitude of 0.55 mTesla to 1.56 mTesla with error rate < 5.9% and frequency of 10 Hz to 50 Hz with error rate <1%. The provided EMF was sufficiently homogeneous over a given volume and was stable over time.

Published
2015-03-30
How to Cite
1.
Movahedi MM, Hatam M, Parsaei H, Tavakoli-Golpaygani A. An Adjustable Extremely Low Frequency Electromagnetic Field Generator. Frontiers Biomed Technol. 2(1):1-7.
Section
Original Article(s)