Název:
Phase and group refractive indices of air calculation by fitting\nof phase difference measured using a combination of laser and\nlow-coherence interferometry
Autoři:
Pikálek, Tomáš ; Šarbort, Martin ; Číp, Ondřej ; Pham, Minh Tuan ; Lešundák, Adam ; Pravdová, Lenka ; Buchta, Zdeněk Typ dokumentu: Příspěvky z konference Konference/Akce: Conference on Optical Measurement Systems for Industrial Inspection /10./, Munich (DE), 20170626
Rok:
2017
Jazyk:
eng
Abstrakt: The air refractive index is an important parameter in interferometric length measurements, since it substantially\naffects the measurement accuracy. We present a refractive index of air measurement method based on monitoring\nthe phase difference between the ambient air and vacuum inside a permanently evacuated double-spaced cell. The cell is placed in one arm of the Michelson interferometer equipped with two light sources—red LED and HeNe laser, while the low-coherence and laser interference signals are measured separately. Both phase and group refractive indices of air can be calculated from the measured signals. The method was experimentally verified by\ncomparing the obtained refractive index values with two different techniques.
Klíčová slova:
air refractive index; laser interferometry; low-coherence interferometry Číslo projektu: LO1212 (CEP), ED0017/01/01 Poskytovatel projektu: GA MŠk, GA MŠk Zdrojový dokument: Optical Measurement Systems for Industrial Inspection X. (Proceedings of SPIE 10329), ISBN 9781510611030, ISSN 0277-786X
Instituce: Ústav přístrojové techniky AV ČR
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Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0278098