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The determination of refractive index distributions for oceanic particulatesRoach, David Michael 09 August 1974 (has links)
The refractive index of particulate matter suspended in seawater
is nonuniform and potentially is an indicator of composition and
origin. A method is described for determining the refractive index
distribution. The method requires the measurement of the volume
scattering function and assumes the total size distribution to be
capable of being reproduced as a linear superposition of hyperbolic
size distributions. The procedure utilizes 40 theoretical volume
scattering functions computed for a range of refractive indices and
particle size distributions. Each one represents a particular combination
of index and distribution. The eight values for the refractive
index (relative to that of water) range from 1.02 to 1.15. The
distribution of refractive index and the total particle size distribution
are determined by finding the best possible representation of the
measured volume scattering function as a linear superposition of the
40 computed functions. An iterative descent method is used to
minimize the error between the measured curve and the superposition
of component scattering functions. If the particle size distribution is
known beforehand, the determination can be restricted to reproduce
the measured distribution to within limits set by a weighting factor.
A similar technique is given for finding the refractive index composition
for phytoplankton populations using measured scattering and
size-distribution data.
Twelve volume scattering functions measured in oceanic
environments (Sargasso Sea, Mediterranean Sea and Baltic Sea) and
three measured in cultured phytoplankton populations (the dinoflaggelate
Amphidinium carterae, and unidentified unicellular alga labeled
T-24, and a centric diatom of the genus Biddulphia) were analyzed.
Determinations for the Mediterranean Sea were performed at a series
of depths extending from near surface to 2OO m. All the determinations
showed the refractive index distributions to be essentially
bimodal with components of refractive indices near 1.05 and 1.15.
The method reproduced measured scattering curves with an average
absolute error less than the experimental uncertainty.
Suggestions for obtaining better results using the same technique
are given. / Graduation date: 1975
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The application of the plane grating to the determination of the index of refraction of a gas with values for air from # 2500 to # 6500 ...Dickey, Robert William, January 1916 (has links)
Thesis (Ph. D.)--Johns Hopkins University, 1916. / Reprinted from the Astrophysical journal, vol. XLV, no. 3, April, 1917.
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Change of index of refraction of water with change of temperatureOsborn, Frederick Arthur, January 1913 (has links)
Thesis (Ph. D.)--University of Michigan, 1907. / "Reprinted from the Physical Review, n.s., vol. I., no. 3, March, 1913."
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Change of index of refraction of water with change of temperatureOsborn, Frederick Arthur, January 1913 (has links)
Thesis (Ph. D.)--University of Michigan, 1907. / "Reprinted from the Physical Review, n.s., vol. I., no. 3, March, 1913."
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The application of the plane grating to the determination of the index of refraction of a gas with values for air from # 2500 to # 6500 ...Dickey, Robert William, January 1916 (has links)
Thesis (PH. D.)--Johns Hopkins university, 1916. / Reprinted from the Astrophysical journal, vol. XLV, no. 3, April, 1917.
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On the relation between density and index of refraction of air ... /Gale, Henry Gordon, January 1900 (has links)
Thesis (Ph. D.)--University of Chicago. / "Reprinted from the Physical review, Vol. XIV, No. 1, January, 1902." Includes bibliographical references. Also available on the Internet.
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The precise determination of refractometric parameters for atmospheric gasesBirch, K. P. January 1988 (has links)
No description available.
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Fibre-optic long period gratings for sensing applicationsKhaliq, Sarfraz January 2003 (has links)
Long period gratings (LPGs) are formed by inducing a permanent periodic modulation of the refractive index (RI) of the core of an optical fibre. The transmission spectrum of the LPG contains a series of attenuation bands centered at discrete wavelengths. The exact form of the transmission spectrum and the central wavelengths of the attenuation bands, are sensitive to the period and the length of the LPG and to the local environment. The sensitivity of a LPG to a particular measurand is dependant upon the composition of the fibre and upon the order of the cladding mode to which the guided mode is coupled to and is thus different for each attenuation band.
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Improvement of Refractive Index Models for Direct-Gap SemiconductorsLin, Eu-Ying 16 July 2003 (has links)
Abtract
In this thesis, our purpose is to improve the refractive index models for direct-gap semiconductors. For refractive index spectrum of direct-gap compound semiconductors, most experimental data is available only bellow the bandgap absorption edge. For used in the optimum design of eltro-optic devices, such as waveguide, electro-absorption modulator and Mach-Zehnder interferometer. We have to utilize a little experimental data to extend refractive index spectrum to near and just above the band-gap edge.
We have known that square of refractive index ( ) is dielectric constant ( ), so we decompose the dielectric constant ( ) into the part of band-to-band absorption and another part of single-oscillator high energy absorption.
For the part of band-to-band absorption, we added broadening parameter ( ) and used Kramers-Kronig relation to transform the absorption coefficient into dielectric constant. For another part of single-oscillator high energy background absorption, we first cut the absorption part form experimental data and then use Sellmeier¡¦s equation to fit the residue data. Finally, recombine all equations and extend refractive index spectrum to near and just above the band-gap edge.
We successfully built whole model and confirm our model with GaAs. The calculation result on GaAs shows an excellent agreement with the reported experimental data. Furthermore, We apply our model to direct-gap binary¡Bternary and quaternary compounded materials and extend our model to near and just above the band-gap edge very well.
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Sample quantity production of ultra-high refractive index distributions of glass microspheresKuney, Clark G. January 2003 (has links) (PDF)
Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2003. / Includes bibliographical references.
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