Measurement of the refractive index of glass fibers by the Christiansen-Shelyubskii method

Kang, Sang Koo; Day, Delbert E.; Stoffer, James O.

doi:10.1016/s0022-3093(97)00274-3

Cited by 13 publications

(10 citation statements)

References 9 publications

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“…Epoxy resins reinforced with micro-sized glass particles or fibers have been successful in obtaining high strength and low thermal expansion with very low loss of transparency. [1][2][3][4][5][6][7] However, in microsized reinforcement composites, the refractive indices of reinforcements and resins must be matched at least to the third decimal place to prevent light scattering, [3][4][5] which in practice is a critical disadvantage. Even if the refractive indices of resins and reinforcements are accurately matched, the temperature dependency of the resin's refractive index makes the composites opaque or nontransparent as a result of temperature variations.…”

mentioning

confidence: 99%

Optically transparent bionanofiber composites with low sensitivity to refractive index of the polymer matrix

Nogi¹,

Handa²,

Nakagaito³

et al. 2005

Applied Physics Letters

181

113

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Transparent polymers were reinforced by bacterial cellulose (BC) nanofibers, which are 10×50nm ribbon-shaped fibers. They exhibited high luminous transmittance at a fiber content as high as 60 wt %, and low sensitivity to a variety of refractive indices of matrix resins. Due to the nanofiber size effect, high transparency was obtained against a wider distribution of refractive index of resins from 1.492 to 1.636 at 20 °C. The optical transparency was also surprisingly insensitive to temperature increases up to 80 °C. As such, BC nanofibers appear to be viable candidates for optically transparent reinforcement.

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mentioning

confidence: 99%

Optically transparent bionanofiber composites with low sensitivity to refractive index of the polymer matrix

Nogi¹,

Handa²,

Nakagaito³

et al. 2005

Applied Physics Letters

181

113

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“…Specifically, shifts in maxima and minima of the transmission appear to be almost a linear function of the number of bilayers. This fact results from the similar RIs of the fibre glass 34,35 and PAH/PSS 36,37 ; thus, polymer coatings can be considered an effective instrument to vary the thickness of the core fibre capillary. Hence, the spectral positions of the transmission maxima and minima can be described by Eqs.…”

Section: Optical Transmission Of Functionalized Hc-mofsmentioning

confidence: 99%

Multispectral sensing of biological liquids with hollow-core microstructured optical fibres

et al. 2020

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The state of the art in optical biosensing is focused on reaching high sensitivity at a single wavelength by using any type of optical resonance. This common strategy, however, disregards the promising possibility of simultaneous measurements of a bioanalyte’s refractive index over a broadband spectral domain. Here, we address this issue by introducing the approach of in-fibre multispectral optical sensing (IMOS). The operating principle relies on detecting changes in the transmission of a hollow-core microstructured optical fibre when a bioanalyte is streamed through it via liquid cells. IMOS offers a unique opportunity to measure the refractive index at 42 wavelengths, with a sensitivity up to ~3000 nm per refractive index unit (RIU) and a figure of merit reaching 99 RIU−1 in the visible and near-infra-red spectral ranges. We apply this technique to determine the concentration and refractive index dispersion for bovine serum albumin and show that the accuracy meets clinical needs.

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“…Particularly within transparent soil, incident light is scattered and refracted consecutively on multiple solid-liquid interfaces while transmitted light is attenuated. Assuming that inhomogeneity of random packing in solid particles has a Gaussian distribution in the refractive index [25], a modified equation of the Raman Varshneya [26] method is derived as follows:…”

Section: Principle Of the Christiansen Effectmentioning

confidence: 99%

Quantification of the Transparency of the Transparent Soil in Geotechnical Modeling

Tian

et al. 2018

Advances in Civil Engineering

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An indispensable process of geotechnical modeling with transparent soils involves capturing and analyzing images, in which favorable transparency is required for optical measurements. This paper proposes an objective framework for quantification of transparency in transparent soil based on its transmittance. Specifically, transparent soil with fused quartz serves as the soil sample for the detection of transmittance, and transmittance’s impact on imaging quality in geotechnical modeling with transparent soil is investigated through an evaluation function of image clarity. According to the results of research about transparent soil with fused quartz, viewing depth and refractive index matching are the dominant factors that affect variations in transmittance of transparent soil, and the variations of transmittance are subjected to exponential decay regarding viewing depth or refractive index matching based on the theoretical modeling’s function of curve fitting. Moreover, experimental results indicate that imaging quality of geotechnical modeling with transparent soil is enhanced with increasing transmittance, and imaging quality shows a remarkable improvement when transmittance is greater than 90%.

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Measurement of the refractive index of glass fibers by the Christiansen-Shelyubskii method

Cited by 13 publications

References 9 publications

Optically transparent bionanofiber composites with low sensitivity to refractive index of the polymer matrix

Optically transparent bionanofiber composites with low sensitivity to refractive index of the polymer matrix

Multispectral sensing of biological liquids with hollow-core microstructured optical fibres

Quantification of the Transparency of the Transparent Soil in Geotechnical Modeling

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