NDLI: Evaluation of the measurement equipment for electromagnetic fields in the near-field and far-field zones

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Proceedings of the Second International Symposium of Trans Black Sea Region on Applied Electromagnetism (Cat. No.00TH8519)

Proceedings of the Second International Symposium of Trans Black Sea Region on Applied Electromagnetism (Cat. No.00TH8519)

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Source-excited electromagnetic fields on cylindrically stratified guiding structures in a gyrotropic medium

Compact VLF antenna surrounded with a magnetized plasma shell

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A step-by-step development of an electrical impedance tomography system

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Spot model for evaluating safety zones around sources of electromagnetic radiation emitting in two or more frequency ranges and its application for health risk assessment

Evaluation of the measurement equipment for electromagnetic fields in the near-field and far-field zones

Measurements and evaluation of the induced voltage on a transmission line placed inside a human body simulator

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Scattering of a standing surface wave on a temporal discontinuity of a waveguiding plasma medium

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Approximation of the error caused by the radio deviation in the automatic direction finder

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Finite element analysis of disproportionate regions

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Trans Black Sea Region Symposium on Applied Electromagnetism

Evaluation of the measurement equipment for electromagnetic fields in the near-field and far-field zones

Content Provider	IEEE Xplore Digital Library
Author	Israel, M.S. Chobanov, P.D.
Copyright Year	2000
Description	Author affiliation: Nat. Center of Hygiene, Med. Ecology & Nutrition, Sofia, Bulgaria (Israel, M.S.)
Abstract	Summary form only given. Almost all measurements for assessment of electromagnetic radiation effect on human health are practically made in the near-field and intermediate zones around the emitter. However, the equations of classic electrodynamics could not be used for calculating the electromagnetic radiation (EMR) in the above mentioned zones. Unfortunately, the equipment used for the radiofrequency (RF), and microwave ranges is most often calibrated only for power density measurements (for far-field zone). The use of such equipment in the near-field zone (without being calibrated for both electric and magnetic fields, separately) produces errors, which could not be easily evaluated. Sometimes the error may exceed in orders. A theoretical model for evaluation of equipment for nonselective measurements of EMR is presented using one calibrated only for the far-field zone, and used for all kind of measurements (including the near-fields). A model for assessment of the error in radiofrequency EMR measurements is developed on the basis of the apparatus' function of measuring equipment, and on the measured frequency range. The model affords an opportunity for the error's assessment in the near-field measurements with a calibration only for the far-field zone. A comparative evaluation of the errors from the measurements by different detector type (crystal and/or thermoresistor) has been performed using the proposed method. The crystal detector (calibrated for the far-field) gives an additional error of /spl plusmn/15%. The results of the comparison are shown as graphics. The model outlines once again the necessity of calibration in both homogeneous electric and/or magnetic fields.
File Size	63376
File Format	PDF
ISBN	0780364287
DOI	10.1109/AEM.2000.943198
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-29
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electromagnetic measurements Electromagnetic fields Magnetic field measurement Electromagnetic radiation Radio frequency Frequency measurement Calibration Detectors Humans Equations
Content Type	Text
Resource Type	Article

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