Passively-coupled, low-coherence interferometric duct profiling with an astigmatism-corrected conical mirror

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dc.contributor.authorFord, Helen D.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2017-04-10T08:17:55Z
dc.date.available2017-04-10T08:17:55Z
dc.date.issued2017-04-06
dc.description.abstractDuct-profiling in test samples up to 25 mm in diameter has been demonstrated using a passive, low-coherence probe head with a depth resolution of 7.8 μm, incorporating an optical-fibre-linked conical mirror addressed by a custom-built array of single-mode fibres. Zemax modelling, and experimental assessment of instrument performance, show that degradation of focus, resulting from astigmatism introduced by the conical mirror, is mitigated by the introduction of a novel lens element. This enables a good beam focus to be achieved at distances of tens of millimetres from the cone axis, not achievable when the cone is used alone. Incorporation of the additional lens element is shown to provide a four-fold improvement in lateral imaging resolution, when compared with reflection from the conical mirror alone.en_UK
dc.identifier.citationFord HD, Tatam RP. (2017) Passively-coupled, low-coherence interferometric duct profiling with an astigmatism-corrected conical mirror. Optics Express, Volume 25, Issue 8, 2017 pp. 8896-8915en_UK
dc.identifier.cris17250004
dc.identifier.issn1094-4087
dc.identifier.urihttp://dx.doi.org/10.1364/OE.25.008896
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/11757
dc.language.isoenen_UK
dc.publisherOptical Society of Americaen_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectFiber optics imagingen_UK
dc.subjectFiber optics sensorsen_UK
dc.subjectNonspherical mirror surfacesen_UK
dc.subjectOptical coherence tomographyen_UK
dc.subjectMetrological instrumentationen_UK
dc.titlePassively-coupled, low-coherence interferometric duct profiling with an astigmatism-corrected conical mirroren_UK
dc.typeArticleen_UK

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