Low-coherence and broadband confocal refractometry: reducing the measurement time

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dc.contributor.authorFrancis, Daniel
dc.contributor.authorHallam, Jonathan M.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2023-09-18T10:09:00Z
dc.date.available2023-09-18T10:09:00Z
dc.date.issued2023-09-04
dc.description.abstractThis paper describes the steps taken to improve the measurement speed of a combined low-coherence and confocal refractive index measurement system. The instrument measures the refractive index and thickness of transparent plates using a fibre-based low-coherence interferometer with a line-scan spectrometer. The spectrometer allows on-line dispersion measurement which is necessary to derive the sample thickness t as well as both the phase and group refractive indices np, ng. The measurements were performed on a sample with six surfaces consisting of three glass windows mounted in a lens tube. Experimental results show that a measurement time of 4.4 s for the multi-layered object, which has a total thickness of approximately 10.5 mm, can be achieved whilst maintaining an accuracy of better than 0.1% for np, ng, and t. This represents an approximately hundredfold improvement over previously published measurements.en_UK
dc.description.sponsorshipEngineering and Physical Sciences Research Council (EPSRC): EP/M010473/1; EP/H02252X/1en_UK
dc.identifier.citationFrancis D, Hallam JM, Tatam RP. (2023) Low-coherence and broadband confocal refractometry: Reducing the measurement time, Measurement Science and Technology, Volume 34, Issue 12, December 2023, Article Number 125204en_UK
dc.identifier.eissn1361-6501
dc.identifier.issn0957-0233
dc.identifier.urihttps://doi.org/10.1088/1361-6501/acf334
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20227
dc.language.isoenen_UK
dc.publisherIOP Publishingen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectconfocalen_UK
dc.subjectrefractometryen_UK
dc.subjectrefractive index measurementen_UK
dc.subjectlow-coherence interferometryen_UK
dc.subjectdispersionen_UK
dc.subjectpeak detectionen_UK
dc.titleLow-coherence and broadband confocal refractometry: reducing the measurement timeen_UK
dc.typeArticleen_UK

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