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Electromagnetic Aquametry - Electromagnetic Wave Interaction with Water and Moist Substances (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Electromagnetic Aquametry - Electromagnetic Wave Interaction with Water and Moist Substances (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Mformation about a material can be gathered from its interaction
with electromagnetic waves. The information may be stored in the
amplitude, the phase, the polarisation, the angular distribution of
energy transportation or the spectral characteristics. When re
trieved from the wave, certain material properties may thus be
determined indirectly. Compared on the one hand to direct material
analysis, an indirect method requires calibration and is prone to
interference from undesired sources. On the other hand, however, it
permits the determination of features inaccessible by direct
methods, such as non-destructive material interrogation, high
measurement speed, or deep penetration depth. However, being a
physical method, the use of electromagnetic waves is still
handicapped by the lack of acceptance by many chemists, who are
used to applying direct approaches. Historically, the first
application of electromagnetic wave interaction with mat ter
involved measurement of amplitude changes at a single frequency
caused by material properties, and it is still used today by some
systems. This approach was soon supplemented by single frequency
phase measurements, in order to avoid distortions through amplitude
instabilities or parasitic reflections. Such single pa rameter
measurements of course require dependence only on one variable in
the measured process and sufficient stability of all other
ancillary conditions. If that is not the case, the single parameter
measurement fails."
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