The gloss trap in diffuse reflectance measurements

1980 ◽  
Vol 5 (2) ◽  
pp. 73-75 ◽  
Author(s):  
Wolfgang Budde
Keyword(s):  
Diffuse Reflectance ◽  
Reflectance Measurements

scholarly journals Spectroscopy in heterogenous media and applications for bioprocess and environmental monitoring

2002 ◽  
Vol 4 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Frank Schael ◽  
Oliver Reich ◽  
Sonja Engelhard
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Transport Theory ◽  
Radiation Transport ◽  
Diffusion Theory ◽  
Nile Blue ◽  
Milk Powder ◽  
Photon Migration ◽  
Heterogenous Media ◽  
Reflectance Measurements

Diffuse reflectance measurements and photon migration studies with near infrared (NIR) diode lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients and species concentrations in heterogenous media. Measurements were performed at a number of wavelengths utilizing several laser sources some of which were widely tunable. In order to establish the applicability of simple photon migration models derived from radiation transport theory and to check the experimental boundary conditions of our measurements, simple light scattering solutions (such as suspensions of titanium dioxide, latex particles, and solutions of milk powder) containing dyes (such as nile blue, isosulfan blue) were investigated. The results obtained from diffuse-reflectance studies at different sourcedetector distances were in accordance with predictions from simple photon diffusion theory. Applications of reflectance measurements for monitoring of cell growth during fermentation processes and forin-situinvestigations of soils are presented.

scholarly journals Use and misuse of the Kubelka-Munk function to obtain the band gap energy from diffuse reflectance measurements

2021 ◽  
pp. 114573
Author(s):  
Salmon Landi ◽  
Iran Rocha Segundo ◽  
Elisabete Freitas ◽  
Mikhail Vasilevskiy ◽  
Joaquim Carneiro ◽  
...  
Keyword(s):  
Band Gap ◽  
Diffuse Reflectance ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Munk Function ◽  
Reflectance Measurements

scholarly journals Metamodeling approach for efficient estimation of optical properties of turbid media from spatially resolved diffuse reflectance measurements

2013 ◽  
Vol 21 (26) ◽  
pp. 32630 ◽  
Author(s):  
Rodrigo Watté ◽  
Nghia Nguyen Do Trong ◽  
Ben Aernouts ◽  
Chyngyz Erkinbaev ◽  
Josse De Baerdemaeker ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Efficient Estimation ◽  
Turbid Media ◽  
Spatially Resolved ◽  
Reflectance Measurements

Anomalous Dispersion Effects in Diffuse Reflectance Infrared Fourier Transform Spectroscopy: A Study of Optical Geometries

1989 ◽  
Vol 43 (2) ◽  
pp. 267-274 ◽  
Author(s):  
D. M. Hembree ◽  
H. R. Smyrl
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance ◽  
Specular Reflection ◽  
Fourier Transform Spectroscopy ◽  
Anomalous Dispersion ◽  
Fresnel Reflection ◽  
Absorption Bands ◽  
Dispersion Effects ◽  
Diffuse Reflectance Infrared ◽  
Reflectance Measurements

In this report, the two most common diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) optical geometries (on-axis and off-axis) are investigated in terms of adherence to the Kubelka-Munk theory. It was found that specular reflection, whether in the form of regular Fresnel reflection or diffuse Fresnel reflection, is the major cause of spectral distortion in typical diffuse reflectance measurements. A discussion of the origin of the variation in specular background associated with resonances is presented. Once the adverse effects of specular reflection are minimized, the linear relationship between response and concentration predicted by Kubelka-Munk theory was found to extend to concentrated samples. Up to a point, this was the case even for intense absorption bands where anomalous dispersion leads to large changes in specular intensity.

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