Terahertz Time Domain Spectroscopy for Non-Destructive Testing of Hazardous Liquids

Lars S. von Chrzanowski; Jörg Beckmann; Barbara Marchetti; Uwe Ewert; Ulrich Schade

doi:10.3139/120.110351

Article

Terahertz Time Domain Spectroscopy for Non-Destructive Testing of Hazardous Liquids

Lars S. von Chrzanowski , Jörg Beckmann , Barbara Marchetti , Uwe Ewert and Ulrich Schade

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 54 Issue 6

Abstract

Hazardous liquids, liquid explosives and flammable liquids are characterized by means of terahertz time domain spectroscopy (THz-TDS) in analogy to existing non-destructive testing (NDT) strategies. Various polar liquids (alcohols, acetone, hydrogen peroxide, nitro methane) and non-polar aircraft and automobile fuels as well as organic solvents are characterized in the practically relevant, non-contact and non-destructive reflection geometry in the time domain. Absorption coefficients and indices of refraction of a representative set of these liquids are investigated in the spectral range between 0.1 THz and 1.1 THz in transmission configuration by two different set-ups either suitable for strongly or weakly absorbing liquids.

Kurzfassung

Flüssige Gefahr- und Brennstoffe sowie explosive Flüssigkeiten werden mittels zeitaufgelöster Terahertz-Spektroskopie (THZ-TDS) in Analogie zu den in der zerstörungsfreien Werkstoffprüfung verwendeten Strategien untersucht. Verschiedene polare Flüssigkeiten (Alkohole, Aceton, Wasserstoffperoxid, Nitromethan), unpolare Flugzeug- und Kraftfahrzeugkraftstoffe sowie organische Lösungsmittel werden in der praxisrelevanten Reflexionsgeometrie berührungs- und zerstörungsfrei im Zeitbereich charakterisiert. Die Absorptions- und Brechungsindizes einer repräsentativen Auswahl von Flüssigkeiten wurden im Frequenzbereich zwischen 0.1 THz und 1.1 THz unter Verwendung der Transmissionsanordnung spektral ermittelt. Die Messkonfiguration wird für stark und schwach absorbierende Flüssigkeiten jeweils angepasst.

Dr. rer. nat. Lars S. von Chrzanowski, born 1974, received the M.S. and Ph.D. degree in chemistry from the Technical University of Berlin, Germany, in 2002 and 2005. Postdoctoral studies in 2006/07 at Utrecht University, the Netherlands referred to the field of small molecule chemical crystallography. From 2008 to 2011 he was fellow at the Federal Institute for Materials Research and Testing BAM, Berlin.

Dr. rer. nat. Jörg Beckmann, born 1959, studied physics at the Technical University Leuna Merseburg and received the Ph.D. at the University of Dresden, Germany. He had postdoc positions at the University of Mainz and at the NIST at Gaithersburg. After joining the BAM he is in the division of Radiological Methods since 2005. He is responsible for research projects in Industrial Digital Radiology and Computed Tomography and applies microwave and THz techniques on non-metallic materials for security applications.

MS Barbara Marchetti, born in 1983, received the Master Degree (with honors) in Physics in 2008 from the University of Rome “Tor Vergata”. She has worked at the BAM as well as at BESSY II (Helmholtz Center for Materials and Energy Berlin HZB). Her research activities is oriented towards machine physics dynamics and diagnostics for linear accelerators and on THz spectroscopy of liquids.

Dr. rer. nat. Uwe Ewert, born 1953, obtained the diploma degree for physical and theoretical chemistry of the Humboldt University in Berlin in 1974. He received the PhD on simulation of electron spin resonance (ESR) spectra in 1979. Then he managed the application laboratory for ESR spectroscopy at the Centre for Scientific Instruments (CSI) of the academy of sciences in Berlin from 1980–1990. Since 1992 he is affiliated with the BAM where he is head of the division “Radiological Methods”.

Dr. rer. nat. Ulrich Schade, born 1958, graduated from the Humboldt University in physics in 1985 and received his PhD in 1990 in semiconductor science. In 1990 he became postdoc at the Tohoku University Sendai and in 1994 he joined the German Aerospace Establishment. Since 2000 he has been with the electron storage ring BESSY II and designed the infrared beamline IRIS. Currently he focuses on infrared synchrotron radiation in material and life sciences.

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Published Online: 2013-05-26

Published in Print: 2012-06-01

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