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Spectral and spatial nondestructive examination of dielectric materials with THz time domain spectroscopy

  • A time domain spectrometer T-ray 2000® operating in the range of 0.2-2 THz was used for Time of Flight measurements. A series of ethanol water mixtures from 10% to 90% were produced subsequently filled in polystyrene cells and analyzed in the T-ray 2000 TDS system in the reflection mode. The reflectivity of the material liquid interface is strongly influenced by the ethanol concentration in water. The reciprocal reflection coefficient of the material liquid interface was found to be a useful discriminating feature for further Probably of Detection calculations which can be used for the performance evaluation of potential THz bottle scanners. THz pulse echo (PE) measurements were performed in comparison to the established ultra sound PE technique for flaw detection of plastics. Synthetic aperture reconstructions were applied for simulated data to reconstruct the flaw shape. The results were compared with B-scan images of a high density polyethylene (HDPE) test cylinder. ExistingA time domain spectrometer T-ray 2000® operating in the range of 0.2-2 THz was used for Time of Flight measurements. A series of ethanol water mixtures from 10% to 90% were produced subsequently filled in polystyrene cells and analyzed in the T-ray 2000 TDS system in the reflection mode. The reflectivity of the material liquid interface is strongly influenced by the ethanol concentration in water. The reciprocal reflection coefficient of the material liquid interface was found to be a useful discriminating feature for further Probably of Detection calculations which can be used for the performance evaluation of potential THz bottle scanners. THz pulse echo (PE) measurements were performed in comparison to the established ultra sound PE technique for flaw detection of plastics. Synthetic aperture reconstructions were applied for simulated data to reconstruct the flaw shape. The results were compared with B-scan images of a high density polyethylene (HDPE) test cylinder. Existing restrictions on the quality of the back projected images and limits of the existing model are discussed in detail.zeige mehrzeige weniger

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Metadaten
Autor*innen:Jörg Beckmann, Lars von Chrzanowski, Daniel Fratzscher, Uwe Ewert
Persönliche Herausgeber*innen:D. O. Thompson, D. E. Chimenti
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Review of progress in quantitative nondestructive evaluation, volume 31
Jahr der Erstveröffentlichung:2012
Herausgeber (Institution):Iowa State University
Verlag:American Institute of Physics
Verlagsort:Melville, NY
Jahrgang/Band:31A
Ausgabe/Heft:1430
Erste Seite:573
Letzte Seite:580
Freie Schlagwörter:Non destructive testing; Polymers; Probability of detection; Terahertz time domain spectroscopy; Thz Tomography; Time of flight diffraction
Veranstaltung:38th Annual Review of Progress in Quantitative Nondestructive Evaluation
Veranstaltungsort:Burlington, VT, USA
Beginndatum der Veranstaltung:17.07.2011
Enddatum der Veranstaltung:22.07.2011
DOI:10.1063/1.4716279
ISSN:0743-0760
ISSN:0094-243X
ISBN:978-0-7354-1013-8
Bemerkung:
Serientitel: AIP conference proceedings – Series title: AIP conference proceedings
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:28.06.2012
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