Time reversal pulsed terahertz inspection of dielectric structures

Issue title: Selected Papers from the 15th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2011)

Article type: Research Article

Authors: Lopato, Przemyslaw^{a; *} | Chady, Tomasz^a

Affiliations: [a] Department of Electrical Engineering, West Pomeranian University of Technology, Szczecin, Poland

Correspondence: [*] Corresponding author: Przemyslaw Lopato, Department of Electrical Engineering, West Pomeranian University of Technology ul. Sikorskiego, 37, 70-313, Szczecin, Poland. Tel.: +4891 449 4792, +4891 449 4134; Fax: +4891 449 4859; E-mail: plopato@zut.edu.pl

Abstract: Nondestructive testing using terahertz frequency electromagnetic waves is becoming increasingly popular method of inspection. Similar operating principle allows the use of inverse algorithms derived from the ultrasonic technique. In this paper algorithm and results of time reversal processing applied to pulsed terahertz inspection of dielectric objects are presented. Time reversal is implemented using finite difference time domain method. New criteria of optimal focusing time are proposed in order to estimate defects positions. Finally the algorithm is verified using the results of simulations and measurements.

Keywords: THz waves time domain measurements, time reversal processing, THz wave propagation numerical modelling

DOI: 10.3233/JAE-2012-1492

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 427-433, 2012