Heat induced damage detection by terahertz (THz) radiation

Ehsan Kabiri Rahani, Tribikram Kundu, Ziran Wu, Hao Xin

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)848-856
Number of pages9
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Volume32
Issue number6
DOIs
StatePublished - Jun 1 2011

Keywords

  • Dielectric properties
  • Nondestructive testing
  • THz time-domain spectroscopy
  • Thermal effects

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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