Journal Title: IEEE Transactions on Microwave Theory and Techniques
Volume: MTT-25 Page: July 197
Published: Jul 01, 1977
Corporate Source:
(Corporate Source(s) Not Available)
Pages: 9
Contract Number: NSF ENG-75-15227
NASA Subject Category: LIFE SCIENCES (GENERAL)
Abstract:
When a human subject is exposed to pulsed microwave radiation, an audible
sound occurs which appears to originate from within or immediately behind the
head. Laboratory studies have also indicated that evoked auditory activities
may be recorded from cats, chinchillas, and guinea pigs. Using a spherical
model of the head, this paper analyzes a process by which microwave energy may
cause the observed effect. The problem is formulated in terms of
thermoelasticity theory in which the absorbed microwave energy represents the
volume heat source which depends on both space and time. The inhomogeneous
thermoelastic motion equation is solved for the acoustic wave parameters under
stress-free surface conditions using boundary value technique and Duhamel's
theorem. Numerical results show that the predicted frequencies of vibration
and threshold pressure amplitude agree reasonably well with experimental
findings.