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THz – ToF optical layer analysis (OLA) to determine optical properties of dielectric materials

  • Electromagnetic waves with frequencies between 0.1 and 10 THz are described as THz-radiation (T-ray). The ability to penetrate dielectric materials makes T-rays attractive to reveal discontinuities in polymer and ceramic materials. THz-Time Domain Spectroscopy Systems (THz-TDS) are available on the market today which operates with THz-pulses transmitted and received by optically pumped semiconductor antennas. In THz-TDS the travelling time (ToF) and shape of the pulse is changed if it interacts with the dielectric material and its inherent discontinuities. A tomogram of the object under the test can be reconstructed from time of flight diffraction (ToFD) scans if a synthetic focusing aperture (SAFT) algorithm is applied. The knowledge of the base materials shape and optical properties is essential for a proper reconstruction result. To obtain these properties a model is assumed which describes the device under the test as multilayer structure composed of thin layers with differentElectromagnetic waves with frequencies between 0.1 and 10 THz are described as THz-radiation (T-ray). The ability to penetrate dielectric materials makes T-rays attractive to reveal discontinuities in polymer and ceramic materials. THz-Time Domain Spectroscopy Systems (THz-TDS) are available on the market today which operates with THz-pulses transmitted and received by optically pumped semiconductor antennas. In THz-TDS the travelling time (ToF) and shape of the pulse is changed if it interacts with the dielectric material and its inherent discontinuities. A tomogram of the object under the test can be reconstructed from time of flight diffraction (ToFD) scans if a synthetic focusing aperture (SAFT) algorithm is applied. The knowledge of the base materials shape and optical properties is essential for a proper reconstruction result. To obtain these properties a model is assumed which describes the device under the test as multilayer structure composed of thin layers with different dielectric characteristics. The Optical Layer Analysis (OLA) is able to fulfill these requirements. A short description why the optical properties are crucial for meaningful SAFT reconstruction results will be given first. Afterwards the OLA will be derived and applied on representative samples to discuss and evaluate ist benefits and limits.zeige mehrzeige weniger

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  • G10F185_QNDE_spranger.pdf
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  • Preface AIP Conference Proceedings 1806.pdf
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Metadaten
Autor*innen:Holger Spranger, Jörg Beckmann
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):AIP Conference Proceedings
Jahr der Erstveröffentlichung:2017
Herausgeber (Institution):American Institute of Physics
Verlag:AIP Publishing
Jahrgang/Band:1806
Ausgabe/Heft:1
Erste Seite:UNSP 120002, 1
Letzte Seite:7
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Optical layer analysis; Optical properties of dielectric materials; THz-TDS; THz-ToF
Veranstaltung:QNDE 2016
Veranstaltungsort:Atlanta, GA, USA
Beginndatum der Veranstaltung:17.07.2016
Enddatum der Veranstaltung:22.07.2016
DOI:10.1063/1.4974707
ISSN:0094-243X
ISBN:978-0-7354-1474-7
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:16.03.2017
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:07.07.2017
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