Journal of Infrared, Millimeter, and Terahertz Waves

, 30:762

Fast and Accurate Thickness Determination of Unknown Materials using Terahertz Time Domain Spectroscopy


DOI: 10.1007/s10762-009-9494-6

Cite this article as:
Scheller, M. & Koch, M. J Infrared Milli Terahz Waves (2009) 30: 762. doi:10.1007/s10762-009-9494-6


We present a fast and accurate time domain based algorithm which extracts simultaneously the thickness and refractive index of highly transparent samples from terahertz time domain spectroscopy data. The utilized transfer function considers the Fabry-Perot oscillations of the sample and enables to analyze data with multiple reflections. The algorithm can also be applied to signals corrupted by vapor absorption lines. Since the data extraction takes only fractions of a second, this computation method is well suited for real-time monitoring of industrial processes. We show that the accuracy of the new algorithm is comparable to that of sophisticated, highly accurate and time consumptive frequency domain algorithms.


TerahertzThickness determinationTime domainData analysisReal timeFabry-Perot

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Institut für HochfrequenztechnikTechnische Universität BraunschweigBraunschweigGermany
  2. 2.Fachbereich PhysikPhilipps Universität MarburgMarburgGermany