An Integrating Sphere for Measuring Diffuse Reflectance in the Near Infrared

Jacquez, John A.; McKeehan, Wayne; Huss, John; Dimitroff, James M.; Kuppenheim, Hans F.

doi:10.1364/josa.45.000781

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…Reflectance measurements from human skin have been reported in the Refs. [62][63][64][65]. Kuppenheim and Heer [65] measured the normal-hemispherical reflectance between 440 and 1000 nm on numerous subjects of white Caucasian and black African descent featuring lightly pigmented and strongly pigmented skin, respectively.…”

Section: Spectral Reflectance Measurements Of In Vivo Human Skinmentioning

confidence: 99%

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Retrieving skin properties from in vivo spectral reflectance measurements

Yudovsky

Pilon

2011

Journal of Biophotonics

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A previously developed inverse method was applied to in vivo normal-hemispherical spectral reflectance measurements taken on the inner and outer forearm as well as the forehead of healthy white Caucasian and black African subjects. The inverse method was used to determine the thickness and melanin concentration in the epidermis, dermal blood volume fraction and oxygen saturation, and skin's spectral scattering coefficient. It was established that changes in melanin concentration due to racial difference and tanning, and differences in epidermal thickness and blood volume with anatomical location were detectable. The retrieved values were also consistent with independent measurements reported in the literature. The same method could be used for optical diagnosis of pathologies affecting the structure and pigmentation of human skin.

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Section: Spectral Reflectance Measurements Of In Vivo Human Skinmentioning

confidence: 99%

“…[65] agrees with that reported in Refs. [62][63][64]. Their measurements consisted of (i) illuminating a circular spot of skin, 1 inch in diameter, with normally incident and monochromatic light and (ii) collecting the hemispherical reflectance with an integrating sphere [65].…”

Section: Spectral Reflectance Measurements Of In Vivo Human Skinmentioning

confidence: 99%

Retrieving skin properties from in vivo spectral reflectance measurements

Yudovsky

Pilon

2011

Journal of Biophotonics

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“…Historically, micro-and nano-scaled powders of magnesium oxide (MgO) and barium sulfate (BaSO 4 ) are chosen as white standard materials since they feature a pronounced and spectrally homogeneous diffuse reflectance in the visible [1,3,15,18,[61][62][63]. Within the past decades, powders of aluminium oxides (Al 2 O 3 ), titanium dioxide (TiO 2 ) or sintered powder polytetrafluoroethylene (PTFE) [3,[64][65][66][67][68][69][70][71][72] became available with high optical quality as well.…”

Section: White Standardsmentioning

confidence: 99%

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

et al. 2019

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This paper addresses the challenging task of optical characterization of pure, dielectric (nano-)powders with the aim to provide an end-to-end instruction from appropriate sample preparation up to the determination of material remission and absorption spectra. We succeeded in establishing an innovative preparation procedure to reproducibly obtain powder pellet samples with an ideal Lambertian scattering behavior. As a result, a procedure based on diffuse reflectance spectroscopy was developed that allows for (i) performing reproducible and artifact-free, high-quality measurements as well as (ii) a thorough optical analysis using Monte Carlo and Mie scattering simulations yielding the absorption spectrum in the visible spectral range. The procedure is valid for the particular case of powders that can be compressed into thick, non-translucent pellets and neither requires embedding of the dielectric (nano-)powders within an appropriate host matrix for measurements nor the use of integrating spheres. The reduced spectroscopic procedure minimizes the large number of sources for errors, enables an in-depth understanding of non-avoidable artifacts and is of particular advantage in the field of material sciences, i.e., for getting first insights to the optical features of a newly synthesized, pure dielectric powder, but also as an inline inspection tool for massively parallelised material characterization.

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“…a summation of reflections, where the total flux is the sum of that reflected once, twice, etc. an integral method, which solves an integral equation of the sphere irradiance [30][31][32]. a matrix method, which solves a coupled set of rate equations accounting for the presence of a finite number of distinct regions of the sphere [28,29]; and iv.…”

Section: Basic Considerationsmentioning

confidence: 99%

Diffuse Reflectance and Transmittance

Höpe¹

2014

Experimental Methods in the Physical Sciences

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An Integrating Sphere for Measuring Diffuse Reflectance in the Near Infrared

Cited by 17 publications

References 10 publications

Retrieving skin properties from in vivo spectral reflectance measurements

Retrieving skin properties from in vivo spectral reflectance measurements

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

Diffuse Reflectance and Transmittance

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