Results 261 to 270 of about 11,613 (304)

A liquids refractive index spectrometer

Sensors and Actuators B: Chemical, 2016
Abstract In this paper, we report about the use of an optical fiber sensor for measurements of the refractive index (η) of liquids as a function of wave-length (λ). The method uses only one optical fiber. Different laser diodes are used to carry out measurements at several wavelengths.
L.S. Vaca-Oyola, E. Marín, J.B. Rojas-Trigos, A. Cifuentes, H. Cabrera, S. Alvarado, E. Cedeño, A. Calderón, O. Delgado-Vasallo   +8 more
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Liquids of High Refractive Index

Nature, 1934
IN measuring the refractive index of precious stones, we have succeeded in extending the range of the total reflectometer type of instrument by the preparation and use of liquids of higher refractivity than the sulphur in methylene iodide solution ...
B. W. ANDERSON, C. J. PAYNE
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Fingerprint indexing for wrinkled fingertips immersed in liquids

Expert Systems with Applications, 2020
Abstract Wrinkled fingerprint recognition has been a challenging problem because of changing the position of fingertip features. This change significantly degrades the fingerprint recognition accuracy. Contactless dry three-dimensional (3D) fingerprints have the advantages of reducing the position change of fingertip features presented in both ...
Javad Khodadoust, Ali Mohammad Khodadoust, Seyed Saeid Mirkamali, Saeed Ayat   +3 more
openaire   +1 more source

The critical behavior of the refractive index near liquid-liquid critical points

The Journal of Chemical Physics, 2012
The nature of the critical behavior in the refractive index n is revisited in the framework of the complete scaling formulation. A comparison is made with the critical behavior of n as derived from the Lorentz-Lorenz equation. Analogue anomalies to those predicted for the dielectric constant ɛ, namely, a leading |t|2β singularity in the coexistence ...
Patricia, Losada-Pérez, Christ, Glorieux, Jan, Thoen   +2 more
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Temperature resilient measurement of refractive index for liquids

2013 Seventh International Conference on Sensing Technology (ICST), 2013
The measurement of refractive index of liquids is of great importance as it is its prime optical property. There are several methods of refractive index measurement for liquids. But the accuracy of measurement is influenced by temperature fluctuations.
Vijayakumar Narayanan, H. Sreehari, S. Sreedevi Nair   +2 more
openaire   +1 more source

Modeling liquid-crystal gradient-index lenses

Journal of the Optical Society of America A, 2007
The optical properties of one-dimensional gradient-refractive-index lens arrays based on liquid crystals are studied. We find that it is quite possible, using theoretical methods, to predict angular distributions of the light emanating from such arrays when they are illuminated with collimated monochromatic light. We compare four theoretical methods in
T C, Kraan, T, van Bommel, R A M, Hikmet
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Refractive Index of Liquid Mixtures: Theory and Experiment

ChemPhysChem, 2010
AbstractAn innovative approach is presented to interpret the refractive index of binary liquid mixtures. The concept of refractive index “before mixing” is introduced and shown to be given by the volume‐fraction mixing rule of the pure‐component refractive indices (Arago–Biot formula).
João Carlos R, Reis, Isabel M S, Lampreia, Angela F S, Santos, Maria Luísa C J, Moita, Gérard, Douhéret   +4 more
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Determination of the refractive index of liquid carbon monoxide

Applied Optics, 1979
The refractive index of liquid carbon monoxide at 78.3 +/- 0.5 K was measured by means of a relatively simple interferometric technique. The values obtained were n = 1.2122 for lambda = 632.8 nm and n = 1.2213 for lambda = 514.5 nm with 0.2% uncertainty.
R E, Gagnon, P H, Gammon, H, Kiefte, M J, Clouter   +3 more
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Refractive Index of Liquid Deuterium

1995
The refractive index of liquid deuterium is often required for the analysis of data obtained from high-energy physics experiments which use bubble chambers containing this liquid as a radiating medium. Until recently no measurements of the refractive index of liquid deuterium had been published. Ayres et al.
G. E. Childs, D. E. Diller
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New low-index liquid refractive index standard: SRM 1922

Fresenius' Journal of Analytical Chemistry, 2000
A new standard for the calibration of refractometers has been developed. Standard Reference Material (SRM) 1922 is a mineral oil with a refractive index nD = 1.46945 at 20 degrees C, which is within the range of the Brix scale (% sucrose). The change in refractive index with temperature (dn/dT) has been characterized for the range 15 degrees C to 35 ...
J R, Verkouteren, S D, Leigh
openaire   +2 more sources