DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Terahertz Electromagnetic Imaging of Dielectric Materials
Final rept. 1 Jan 2003-31 Dec 2005
Pagination or Media Count:
Theoretical and computational methodologies for the investigation of the propagation of high frequency ultrashort electromagnetic pulses in dielectric materials were developed. The models incorporated nonlinearly forced Debye and nonlinear Debye polarization dynamics and demonstrated the importance of taking into consideration nonlinear effects especially when the amplitude of the input signal was large. The development of a Brillouin precursor was demonstrated in linear and nonlinear models and its attenuation rate was analyzed. This study readily extends to include the imaging problem, i.e., the identification of electromagnetic and geometric properties of a hidden substance. Related to the interaction of electromagnetic waves with the dynamics of rubber-like materials, molecular based models for the dynamic extension and shear of elastomer rods and blocks were developed and analyzed.
APPROVED FOR PUBLIC RELEASE