By National Council on Radiation Protection and Measurements
Read Online or Download A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119) PDF
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Extra info for A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119)
The wavefronts are spherical surfaces. The wave propagates radially outward in all directions. The magnetic field component, H, is directed into the page. 2 ELECTROMAGNETIC FIELDS / 33 6. The magnitude of the velocity of propagation (phase velocity) The velocity is less and the wavelength is given by v = (p)-%. is shorter for a wave propagating in matter than for a wave propagating in free space. Plane Waves. A plane wave is another model that represents approximately some actual EM waves, but true plane waves do not exist.
However, caution must still be used. The best procedure for assessing potential absorption of energy by an object in a field (at least for frequencies below a few hundred MHz) is to measure both E2 and H2, because energy absorption can more easily be predicted from them, and many radiofrequency protection guides are expressed in terms ofE2and@. This could cause misunderstanding andlor measurement errors. Suppose, for example, that a meter that measures P, and is calibrated in equivalent plane-wave power density, is placed a distance of 3,414 from a conducting plane in the presence of an incident plane wave.
With FM RF fields, the instantaneous field strength is equal to the average field strength. Examples of FM RF sources include FM radio, some point-to-point microwave radio systems, earth SATCOM systems and cellular telephone systems. Spherical Waves. 4 32 1 2. BASIC CONCEPTS but of course a true spherical wave does not really exist. 15): 1. The wave fronts are spheres and propagate radially outward from the source. E and H are both tangential to the spherical surfaces. 2. Each crest and each trough is a spherical surface and on every sphere's surface, both E and H are constant values.
A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119) by National Council on Radiation Protection and Measurements