Reference-free spectroscopic determination of fat and protein in milk in the visible and near infrared region below 1000 nm using spatially resolved diffuse reflectance fiber probe

Talanta ◽  
2017 ◽  
Vol 167 ◽  
pp. 563-572 ◽  
Author(s):  
Andrey Bogomolov ◽  
Valeria Belikova ◽  
Vladislav Galyanin ◽  
Anastasiia Melenteva ◽  
Hans Meyer
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Infrared Region ◽  
Spectroscopic Determination ◽  
Fiber Probe ◽  
Spatially Resolved ◽  
Near Infrared Region

Optical Fiber Device and Biological Tissue Phantoms for Determination of Optical Parameters in the Near‐Infrared Region

2004 ◽  
Vol 32 (5) ◽  
pp. 489-505 ◽  
Author(s):  
Omar Feix do Nascimento ◽  
Antonio Balbin Villaverde ◽  
Renato Amaro Zângaro ◽  
Marcos Tadeu Tavares Pacheco ◽  
Steven F. Durrant
Keyword(s):  
Optical Fiber ◽  
Biological Tissue ◽  
Near Infrared ◽  
Infrared Region ◽  
Optical Parameters ◽  
Tissue Phantoms ◽  
Near Infrared Region

scholarly journals Photolumineszenz und sensibilisierte IR-Emission der dreiwertigen Seltenen Erden in Ca3La2Te2O12

1985 ◽  
Vol 40 (7) ◽  
pp. 699-705 ◽  
Author(s):  
H.-D. Autenrieth ◽  
B. Kottmann ◽  
S. Kemmler-Sack
Keyword(s):  
Rare Earth ◽  
Diffuse Reflectance ◽  
Near Infrared ◽  
Infrared Region ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
New Host ◽  
Trivalent Rare Earth ◽  
Near Infrared Region ◽  
Ir Emission

By activation of the new host lattice Ca3La2Te2O12 with trivalent rare earth ions an emission in the visible (Ln3+=Sm, Eu, Tb, Dy, Ho, Er, Tm) or near infrared region (Nd, Ho, Er, Tm, Yb) is observed. Energy transfer from Nd3+ to Yb3+ , from Er3+, Yb3+ to Ho3+ and from Yb3+ to Tm3+ has been found to occur. The excitation, emission and diffuse reflectance spectra are analyzed.

Effects of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. (II) Near-infrared region

Clay Minerals ◽  
2000 ◽  
Vol 35 (5) ◽  
pp. 753-761 ◽  
Author(s):  
J. Madejová ◽  
J. Bujdák ◽  
S. Petit ◽  
P. Komadel
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Infrared Region ◽  
Hydroxyl Groups ◽  
Overtone Band ◽  
Stretching Vibration ◽  
Structural Hydroxyl ◽  
Near Infrared Region ◽  
Combination Bands ◽  
Ferruginous Smectite

AbstractDiffuse reflectance spectra in the near-infrared region are presented for Li-saturated smectites heated up to 200°C. The smectites included three montmorillonites, an Fe-beidellite and a ferruginous smectite. Unheated samples showed a complex band near 7060 cm-1 assigned to the first overtone of the OH-stretching mode of structural hydroxyl groups and bound H2O. The OH combination bands appeared in the 4600-4300 cm-1 region. Spectra of heated montmorillonites showed an upward shift and splitting of the OH-overtone band into two components near 7170 and 7110 cm-1. The presence of a band near 7170 cm-1, assigned to the overtone of the AlMgLiOH-stretching vibration, implied that local trioctahedral domains were created upon Li(I) fixation in the previously vacant octahedral positions of montmorillonites. The OH combination bands were shifted to higher frequencies and a new band appeared near 4472 cm-1 in the spectra of montmorillonites heated to temperatures in excess of 130°C. No features indicating Li(I) in the structure of Fe-beidellite or ferruginous smectite were observed in the NIR spectra.

Scattering properties of recycled pulp at the near infrared region and its effect on the determination of residual ink

TAPPI Journal ◽  
2011 ◽  
Vol 10 (6) ◽  
pp. 17-22 ◽  
Author(s):  
MIKA KÖRKKÖ ◽  
OSSI LAITINEN ◽  
ANTTI HAAPALA ◽  
ARI ÄMMÄLÄ ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Near Infrared ◽  
Filler Content ◽  
Infrared Region ◽  
Scattering Coefficient ◽  
Unknown Constant ◽  
Scattering Coefficients ◽  
Recycled Pulp ◽  
Near Infrared Region

Residual ink in recycled pulp can be determined from a wide variety of pads and sheets using either a constant or measured near infrared (NIR) scattering coefficient. The method is usually chosen on the basis of the opaqueness of the prepared test media. Although both methods are regularly used, it is unclear whether NIR scattering properties of pulp vary due to changing proportions of fibers and fines and whether the changing NIR scattering coefficient affects the residual ink values. We investigated the effect of varying scattering coefficient on residual ink results obtained with unknown (constant) and known (measured) NIR scattering coefficients. We measured the NIR scattering coefficients and residual ink values (using the wavelength of 700 nm) from low-grammage sheets with deliberately varied filler content. By varying the filler content, changes were detected in the NIR scattering properties of pulp; therefore, the residual ink values were biased when a constant scattering coefficient was used. However, when the scattering coefficient was measured during the determination of residual ink, no deviation was observed when compared with the values calculated according to mass proportions. The measured NIR scattering coefficient should always be used during the determination of residual ink values.

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