Accession Number : ADA195687

Title :   Transient Interaction of Electromagnetic Pulses in Dielectrics and Microwave Biophysics.

Descriptive Note : Final rept. 15 Feb 85-30 Sep 87,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON DC

Personal Author(s) : Guo, Theodore C ; Guo, Wendy W

PDF Url : ADA195687

Report Date : 12 May 1988

Pagination or Media Count : 23

Abstract : This research includes the following three subjects: 1) Pressure Waves Generated by Microwave Pulses: A thorough formulation on microwave electrostrictive effects is developed. It is shown that pressure waves may be generated via two physical mechanisms, one by thermoelastic process and another by electrostrictive force. On the thermoelastic process, pressure waves are generated by microwave pulses if there are thermal, mechanical, or electrical discontinuities in dielectrics. 2) Transient Dielectric Response: A non-steady state model of dielectric relaxation is developed to analyze dielectric response to short microwave pulses in the transient regime. Microwave Dosimetry and Microwave Imaging: Two non-invasive microwave dosimetry techniques are developed, which are also applied to develop three-dimensional microwave imaging algorithms of arbitrary inhomogeneous dielectric bodies. Keywords: Transient dielectric response, Microwave pulse effect, Microwave acoustics, Microwave electrostrictive effect, Microwave thermoacoustic effect, Microwave scattering, Microwave dosimetry, Microwave imaging. (KT)

Descriptors :   *DIELECTRICS, *MICROWAVES, *RADIATION EFFECTS, ACOUSTIC ARRAYS, ACOUSTICS, ALGORITHMS, BIOPHYSICS, DISCONTINUITIES, DOSIMETRY, ELECTRICAL PROPERTIES, ELECTROMAGNETIC PULSES, ELECTROSTRICTION, IMAGES, INTERACTIONS, MODELS, PHYSICAL PROPERTIES, PRESSURE, PULSES, RELAXATION, RESPONSE, SCATTERING, SHORT PULSES, STEADY STATE, THERMODYNAMICS, THERMOELASTICITY, THREE DIMENSIONAL, TRANSIENTS, WAVES

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE