caa a22 4500 445305193 CHVBK 20180317142610.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10762-011-9784-7 doi (NATIONALLICENCE)springer-10.1007/s10762-011-9784-7 Heat Induced Damage Detection by Terahertz (THz) Radiation [Elektronische Daten] [Ehsan Rahani, Tribikram Kundu, Ziran Wu, Hao Xin] Terahertz (THz) and sub-terahertz imaging and spectroscopy are becoming increasingly popular nondestructive evaluation techniques for damage detection and characterization of materials. THz radiation is being used for inspecting ceramic foam tiles used in TPS (Thermal Protection System), thick polymer composites and polymer tiles that are not good conductors of ultrasonic waves. Capability of THz electromagnetic waves in detecting heat induced damage in porous materials is investigated in this paper. Porous pumice stone blocks are subjected to long time heat exposures to produce heat induced damage in the block. The dielectric properties extracted from THz TDS (Time Domain Spectroscopy) measurements are compared for different levels of heat exposure. Experimental results show noticeable and consistent change in dielectric properties with increasing levels of heat exposure, well before its melting point. Springer Science+Business Media, LLC, 2011 Nondestructive testing nationallicence THz time-domain spectroscopy nationallicence Dielectric properties nationallicence Thermal effects nationallicence Rahani Ehsan Department of Civil Engineering and Engineering Mechanics, University of Arizona, 85721, Tucson, AZ, USA aut Kundu Tribikram Department of Civil Engineering and Engineering Mechanics, University of Arizona, 85721, Tucson, AZ, USA aut Wu Ziran Department of Electrical and Computer Engineering, University of Arizona, 85721, Tucson, AZ, USA aut Xin Hao Department of Electrical and Computer Engineering, University of Arizona, 85721, Tucson, AZ, USA aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 848-856 1866-6892 32:6<848 2011 32 10762 https://doi.org/10.1007/s10762-011-9784-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9784-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rahani Ehsan Department of Civil Engineering and Engineering Mechanics, University of Arizona, 85721, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Kundu Tribikram Department of Civil Engineering and Engineering Mechanics, University of Arizona, 85721, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Wu Ziran Department of Electrical and Computer Engineering, University of Arizona, 85721, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Xin Hao Department of Electrical and Computer Engineering, University of Arizona, 85721, Tucson, AZ, USA aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 848-856 1866-6892 32:6<848 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer