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.…
Autor*innen: | Jörg Beckmann, Lars von Chrzanowski, Daniel Fratzscher, Uwe Ewert |
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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 |