The use of parabolic mirrors in combined low-coherence and confocal refractive index measurement

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dc.contributor.authorFrancis, Daniel
dc.contributor.authorFord, Helen D.
dc.contributor.authorHallam, Jonathan M.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2020-02-20T20:09:00Z
dc.date.available2020-02-20T20:09:00Z
dc.date.issued2019-06-21
dc.description.abstractLow-coherence interferometry is combined with confocal scanning to provide remote refractive index and thickness measurements of transparent materials. The influence of lens aberrations in the confocal measurement is assessed through investigation of the axial point-spread functions (APSFs) generated using optical configurations comprised of paired aspherics and paired achromats. Off-axis parabolic mirrors are suggested as an alternative to lenses and are shown to exhibit much more symmetric APSFs provided the system numerical aperture is not too high. Refractive index and thickness measurements are made with each configuration with most mirror pairings offering better than twice the repeatability and accuracy of either lens pairing.en_UK
dc.identifier.citationFrancis D, Ford HD, Hallam JM, Tatam RP. (2019) The use of parabolic mirrors in combined low-coherence and confocal refractive index measurement. Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI: SPIE Optical Metrology, 24-27 June 2019, Munich, Germanyen_UK
dc.identifier.isbn9781510627918
dc.identifier.issn0277-786X
dc.identifier.urihttps://doi.org/10.1117/12.2525986
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15163
dc.language.isoenen_UK
dc.publisherSPIEen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectconfocalen_UK
dc.subjectlow-coherenceen_UK
dc.subjectinterferometryen_UK
dc.subjectrefractive indexen_UK
dc.subjectparabolic mirroren_UK
dc.subjectaberrationen_UK
dc.subjectpoint-spread functionen_UK
dc.titleThe use of parabolic mirrors in combined low-coherence and confocal refractive index measurementen_UK
dc.typeConference paperen_UK

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