Results 161 to 170 of about 10,250 (215)
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Synthetic aperture rainbow refractometry
Optics Letters, 2022This work proposed a synthetic aperture rainbow refractometry (SARR) by synthesizing rainbow signals of the same droplet with dual-wavelength laser beams, in order to increase the aperture of rainbow refractometry. In this way, the SARR can apply to long distance and small droplets measurement. An achromatic imaging system, which simultaneously records
Xinhao, Wang +5 more
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Optical coherence refractometry
Optics Letters, 2008We introduce a novel approach to refractometry using a low coherence interferometer at multiple angles of incidence. We show that for plane parallel samples it is possible to measure their phase refractive index rather than the group index that is usually measured by interferometric methods.
Peter H, Tomlins +4 more
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Laser Meridional Refractometry
Optometry and Vision Science, 1976Laser meridonal refractions were undertaken on 30 subjects. The results were compared to classical subjective techniques utilizing both correlative statistics and clinical criteria. The laser meridional techniques were highly correlated with the subjective procedures and were accurate when judged by clinical criteria.
C, Haine, W, Long, R, Reading
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Archives of Ophthalmology, 1970
Three methods for simplifying the solution of the equations used in meridional refractometry are outlined: solution by time-sharing, multiple-access digital computers; solution by special-purpose analogue computer; and solution by nomogram. The advantages and the disadvantages of each method are discussed.
R F, Brubaker +2 more
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Three methods for simplifying the solution of the equations used in meridional refractometry are outlined: solution by time-sharing, multiple-access digital computers; solution by special-purpose analogue computer; and solution by nomogram. The advantages and the disadvantages of each method are discussed.
R F, Brubaker +2 more
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Journal of Microscopy, 1983
SUMMARYImmersion refractometry is based on matching the refractive index of the medium to that of the cytoplasm of the cell, in which case the latter will have minimum contrast in the phase contrast microscope and will practically disappear. The cytoplasm is then said to be at the match point with the medium. Since the refractive index of a solution is
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SUMMARYImmersion refractometry is based on matching the refractive index of the medium to that of the cytoplasm of the cell, in which case the latter will have minimum contrast in the phase contrast microscope and will practically disappear. The cytoplasm is then said to be at the match point with the medium. Since the refractive index of a solution is
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Archives of Ophthalmology, 1969
Meridional refractometry is a process whereby the meridional power of the corrective lens is measured in three predetermined meridians of the eye and the final prescription calculated from these data. The calculation is based on equations derived from Laurance's approximation of the meridional power of a cylindrical lens.
R F, Brubaker +2 more
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Meridional refractometry is a process whereby the meridional power of the corrective lens is measured in three predetermined meridians of the eye and the final prescription calculated from these data. The calculation is based on equations derived from Laurance's approximation of the meridional power of a cylindrical lens.
R F, Brubaker +2 more
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Three-dimensional rainbow refractometry
Optics LettersWe propose a new, to the best of our knowledge, rainbow technique called three-dimensional rainbow refractometry (TDRR), with a cylindrical lens in the signal collecting system. With a TDRR model based on the ray transfer matrix developed, it is proved that the tilt angle of the rainbow signal is related to the axial position of the droplet, which ...
Zhiwen, Deng +6 more
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Instant photographic refractometry in children
Acta Ophthalmologica, 1988Abstract. A simple photographic method for detection and measurement of refractive errors in children, using a specially designed camera and electronic flash unit and ‘instant’ (Polaroid) film, was tested on 64 children, aged 3 to 8 years, and compared with the results from retinoscopy. The refractive errors ranged from ‐6.5 to +6.5 D.
P, Wanger, G, Waern
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Optical Coherence Tomography and Coherence Techniques II, 2005
We use dispersion data to measure concentrations of pure solutions and mixtures. Spectral dispersion data are obtained from white-light interferograms. Such a technique can be used for depth-localized refractometry and as contrasting technique in OCT.
M. Bagherzadeh +4 more
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We use dispersion data to measure concentrations of pure solutions and mixtures. Spectral dispersion data are obtained from white-light interferograms. Such a technique can be used for depth-localized refractometry and as contrasting technique in OCT.
M. Bagherzadeh +4 more
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2015
Abstract The refractive index of materials is one of their most basic optical properties. In the case of liquids, the refractive index has been employed by chemists for many years to document sample purity. The simplest way to determine the refractive index is by measuring the angle at which light bends at an interface between two ...
Robert N. Compton, Michael A. Duncan
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Abstract The refractive index of materials is one of their most basic optical properties. In the case of liquids, the refractive index has been employed by chemists for many years to document sample purity. The simplest way to determine the refractive index is by measuring the angle at which light bends at an interface between two ...
Robert N. Compton, Michael A. Duncan
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