Optical absorption and scattering of bovine cornea, lens and retina in the visible region

Sardar, Dhiraj K.; Yust, Brian; Barrera, Frederick J.; Mimun, L. Christopher; Tsin, Andrew

doi:10.1007/s10103-009-0677-0

Cited by 36 publications

(20 citation statements)

References 29 publications

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“…Comparing the coefficients to our previous work in the visible region [25], as shown in the figure insets for context, it can be seen that both cornea samples had noticeably lower values for μ a and μ s in the NIR than was found in the visible region. Conversely, the lenses and retinas had μ a values in the NIR which were very similar to the visible region.…”

Section: Resultsmentioning

confidence: 60%

Optical absorption and scattering of bovine cornea, lens, and retina in the near-infrared region

2011

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The optical properties of bovine ocular tissues have been determined at laser wavelengths in the near-infrared (NIR) region. The inverse adding doubling (IAD), Kubelka–Munk (KM), and inverse Monte Carlo (IMC) methods were applied to the measured values of the total diffuse transmission, total diffuse reflection, and collimated transmission to determine the optical absorption and scattering coefficients of the bovine cornea, lens and retina from 750 to 1,000 nm using a CW Ti:sapphire laser. The optical properties obtained from these three methods have been compared and are discussed.

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Section: Resultsmentioning

confidence: 60%

Optical absorption and scattering of bovine cornea, lens, and retina in the near-infrared region

2011

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“…The phosphor blue light absorption coefficient and red light absorption coefficient were calculated from the transmission and reflection components of the light using a double integrating sphere measurement setup. The double integrating sphere experimental apparatus used was similar to the apparatus used in past research [12], [13] while the calculations of the absorption coefficients were based on Sardar et al's work [13] . The conversion efficiency of the phosphor was calculated from spectral power distributions recorded using an integrating sphere measurement system.…”

Section: Methodsmentioning

confidence: 99%

Mathematical model to analyze phosphor layer heat transfer of an LED system

Perera¹,

Narendran²

2014

SPIE Proceedings

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This study investigated the capability of a mathematical model in estimating the phosphor layer heat transfer of an LED system. The focus was on determining the temperature distribution based on light propagation in the phosphor layer. The mathematical model was built upon past work by Kang et al. and solved numerically with heat generation and transfer incorporated into the model. The model light propagation and heat generation was compared with past research and then used to simulate an experimental study in order to evaluate the solution from the present model and compare it with the temperature measurements of the experimental study. The solution to the temperature distribution using the mathematical model had good agreement with the experimentally measured temperature values using an IR thermal imaging camera. Then the model was used to predict the temperature distribution in the phosphor layer under different heat transfer conditions to provide insight that is difficult to observe in experimental studies due to practical limitations.

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“…The details of the measurements needed may be found in our previous work. 1 By moving Sphere II back along the lasers axis by 1 meter, a measure of the collimated transmittance may also be obtained. These measurements may then be used in the various techniques discussed herein to yield values for the absorption and scattering coefficients, μ a and μ s .…”

Section: Experimental Methods and Samplesmentioning

confidence: 99%

A comparison of methods for determining optical properties of thin samples

2010

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The near-infrared (NIR) optical properties of human retinal pigmented epithelial (RPE) cells and rare earth nanopowders were studied using a double-integrating sphere setup. The Kubelka-Munk and Inverse Adding-Doubling techniques were applied to obtain absorption and scattering coefficients. These are compared with the coefficients obtained through the Representative Layer Theory described by the Dahm equation. Retinal pigmented epithelial monolayers were cultured from an ARPE19 line in thin cell culture windows, and the nanopowders were pressed into samples of varying thickness. Samples were optically characterized as a function of wavelength. A brief discussion of the shortcomings of existing techniques for computing optical properties when applied to physically thin samples is provided, followed by a comparison between the optical properties of the samples returned by the different techniques.

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Optical absorption and scattering of bovine cornea, lens and retina in the visible region

Cited by 36 publications

References 29 publications

Optical absorption and scattering of bovine cornea, lens, and retina in the near-infrared region

Optical absorption and scattering of bovine cornea, lens, and retina in the near-infrared region

Mathematical model to analyze phosphor layer heat transfer of an LED system

A comparison of methods for determining optical properties of thin samples

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