Verfasst: 10. Sep 2009, 23:40
Manchmal ist es einfacher als man denkt.
Auditory response to pulsed radiofrequency
Googled man nach diesem Titel, so finden sich zahlreiche wissenschaftliche Arbeiten zu dem Thema.
Die Inhalte sind brisant und geben uns Brummtonbetroffenen endlich Antworten.
vor allem:
http://grouper.ieee.org/groups/scc28/sc ... ffects.pdf
Auditory Response to Pulsed
Radiofrequency Energy
J.A. Elder* and C.K. Chou
Motorola Florida Research Laboratories, Ft. Lauderdale, FL, USA
The human auditory response to pulses of radiofrequency (RF) energy, commonly called RF hearing,
is a well established phenomenon. RF induced sounds can be characterized as low intensity sounds
because, in general, a quiet environment is required for the auditory response. The sound is similar to
other common sounds such as a click, buzz, hiss, knock, or chirp. Effective radiofrequencies range
from 2.4 to 10 000 MHz, but an individual’s ability to hear RF induced sounds is dependent upon high
frequency acoustic hearing in the kHz range above about 5 kHz. The site of conversion of RF energy to
acoustic energy is within or peripheral to the cochlea, and once the cochlea is stimulated, the detection
of RF induced sounds in humans and RF induced auditory responses in animals is similar to acoustic
sound detection. The fundamental frequency of RF induced sounds is independent of the frequency of
the radiowaves but dependent upon head dimensions. The auditory response has been shown to be
dependent upon the energy in a single pulse and not on average power density. The weight of evidence
of the results of human, animal, and modeling studies supports the thermoelastic expansion theory as
the explanation for the RF hearing phenomenon. RF induced sounds involve the perception via bone
conduction of thermally generated sound transients, that is, audible sounds are produced by rapid
thermal expansion resulting from a calculated temperature rise of only 5106° C in tissue at the
threshold level due to absorption of the energy in the RF pulse. The hearing of RF induced sounds at
exposure levels many orders of magnitude greater than the hearing threshold is considered to be a
biological effect without an accompanying health effect. This conclusion is supported by a comparison
of pressure induced in the body by RF pulses to pressure associated with hazardous acoustic energy
and clinical ultrasound procedures. Bioelectromagnetics Supplement 6:S162–S173, 2003.
Zuletzt bearbeitet von hum_ohr am 12 Sep 2009 22:36, insgesamt 2-mal bearbeitet
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