scholarly journals A NIR-Spectroscopy-Based Approach for Detection of Fluids in Rectangular Glass Micro-Capillaries

2020 ◽  
Vol 2 (1) ◽  
pp. 43
Author(s):  
Valentina Bello ◽  
Elisabetta Bodo
Keyword(s):  
Light Propagation ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Infrared Region ◽  
Broadband Radiation ◽  
Fluid Detection ◽  
Aluminum Mirror ◽  
Tungsten Lamp ◽  
Good Agreement ◽  
Rectangular Glass

In this work, we present a micro-opto-fluidic platform to distinguish water and alcohol samples flowing in rectangular glass micro-capillaries laid onto a bulk Aluminum mirror illuminated by the broadband radiation emitted by a Tungsten lamp. The fluid detection is based on the spectral analysis of the light reflected by the micro-structure in the near-infrared region from 1.0 μm to 1.7 μm. A theoretical model was implemented to study light propagation in the channel, taking into account absorption effects, and the results of the simulation are in good agreement with the experimental spectra obtained by testing water, ethanol, isopropanol and ethylene glycol.

scholarly journals Near-Infrared Spatial Self-Phase Modulation in Ultrathin Niobium Carbide Nanosheets

2021 ◽  
Vol 9 ◽  
Author(s):  
Si Xiao ◽  
Yi-lin He ◽  
Yu-lan Dong ◽  
Yi-duo Wang ◽  
Li Zhou ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Light Propagation ◽  
Near Infrared ◽  
Niobium Carbide ◽  
Infrared Region ◽  
Hybrid Structure ◽  
Optical Parameters ◽  
Self Phase Modulation ◽  
Non Linear ◽  
Linear Optical

Spatial self-phase modulation (SSPM) as a purely coherent non-linear optical effect (also known as Kerr effect) can support strong broadband phase modulation, which is essential for all-optical applications. Besides this, the increasing use of two-dimensional (2D) materials opens up new prospects in this field of research. In this work, we report a broadband SSPM response from 2D transition metal carbonitrides (MXenes) and Nb2C, arising in the near-infrared (1,550 nm) range. Based on the SSPM measurements of few-layer Nb2C nanosheets, the third-order non-linear optical parameters of Nb2C, including the non-linear refractive index n2 and susceptibility χ(3), were determined at 400, 800, 1,300, and 1,550 nm. Moreover, the physics mechanism of the dynamic formation process of SSPM diffraction rings was exploited. The formation time of SSPM diffraction rings can be divided into two typical parts which correspond to the polarization and reorientation of 2D Nb2C nanosheets. As a proof of concept, we demonstrate the nonreciprocal light propagation at wavelengths of 1,300 and 1,550 nm by constructing an Nb2C/water hybrid structure. Our results reveal strong optical phase modulation of Nb2C in the infrared region, thus showing the great potential of MXene materials for use in passive photonic devices.

Electromagnetic interference shielding study in microwave and NIR regions by highly efficient Ag/ZnS and polyaniline-Ag/ZnS particles

2021 ◽  
pp. 089270572110649
Author(s):  
Muhammad Zahid ◽  
HM Fayzan Shakir ◽  
Zulfiqar Ahmad Rehan
Keyword(s):  
Electromagnetic Interference ◽  
Near Infrared ◽  
Oxidative Polymerization ◽  
Composite Films ◽  
Nir Spectroscopy ◽  
Infrared Region ◽  
Nanocomposite Films ◽  
Emi Shielding ◽  
Zns Nanoparticles ◽  
Co Precipitation

The chemical oxidative polymerization and co-precipitation methods were employed for the preparations of polyaniline (PANI) and silver-doped zinc sulfide (ZnS) nanoparticles to be used for electromagnetic interference (EMI) shielding. PVC-based composite films were fabricated by the incorporation of Ag/ZnS and PANI-Ag/ZnS nanoparticles. These nanoparticles were first analyzed by X-ray diffraction and zetasizer for their crystal structure and particle size. Prepared nanocomposite films were then analyzed for various properties like electrical conductivity, transmission in the near-infrared region (700 nm to 2500 nm), and EMI shielding efficiency in the microwave region (0.1 GHz to 20 GHz). These parameters were characterized by DC Conductivity, NIR spectroscopy, and vector network analyzer. It was found that with the addition of the concentration of nanoparticles, both values of conductivity and shielding efficiency improved. The highest attenuation value in 0.1 to 20 GHz reached 52.5 dB in 0.1 to 20 GHz frequency for 20 wt% PANI-Ag/ZnS and < 0.5% transmission was evaluated in the NIR region.

scholarly journals Application of the Non-Destructive NIR Technique for the Evaluation of Strawberry Fruits Quality Parameters

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 441 ◽  
Author(s):  
Manuela Mancini ◽  
Luca Mazzoni ◽  
Francesco Gagliardi ◽  
Francesca Balducci ◽  
Daniele Duca ◽  
...  
Keyword(s):  
Near Infrared ◽  
Nir Spectroscopy ◽  
Principal Component ◽  
Infrared Region ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Electromagnetic Spectrum ◽  
Least Squares Regression ◽  
Solids Content ◽  
Non Destructive

The determination of strawberry fruit quality through the traditional destructive lab techniques has some limitations related to the amplitude of the samples, the timing and the applicability along all phases of the supply chain. The aim of this study was to determine the main qualitative characteristics through traditional lab destructive techniques and Near Infrared Spectroscopy (NIR) in fruits of five strawberry genotypes. Principal Component Analysis (PCA) was applied to search for spectral differences among all the collected samples. A Partial Least Squares regression (PLS) technique was computed in order to predict the quality parameters of interest. The PLS model for the soluble solids content prediction was the best performing—in fact, it is a robust and reliable model and the validation values suggested possibilities for its use in quality applications. A suitable PLS model is also obtained for the firmness prediction—the validation values tend to worsen slightly but can still be accepted in screening applications. NIR spectroscopy represents an important alternative to destructive techniques, using the infrared region of the electromagnetic spectrum to investigate in a non-destructive way the chemical–physical properties of the samples, finding remarkable applications in the agro-food market.

Application of near Infrared Spectroscopy to the Measurement of Cell Mass in Solid Cultures of Mushroom

1998 ◽  
Vol 6 (1) ◽  
pp. 273-277 ◽  
Author(s):  
Ken-Ichiro Suehara ◽  
Yasuhisa Nakano ◽  
Takuo Yano
Keyword(s):  
Growth Rate ◽  
Cell Wall ◽  
Conventional Method ◽  
Ganoderma Lucidum ◽  
Near Infrared ◽  
Cell Mass ◽  
Nir Spectroscopy ◽  
Culture Cell ◽  
Solid Culture ◽  
Good Agreement

Near infrared (NIR) spectroscopy was applied to the prediction of the growth rate of mushroom, Ganoderma lucidum, in a solid culture. Cell mass is conventionally measured by analysing the concentration of glucosamine which is a component of the cell wall. The correlation between the concentration of glucosamine obtained by the conventional method and that obtained by NIR spectroscopy was examined by multiple regression analysis. The value predicted by NIR spectroscopy was in fairly good agreement with that obtained by the conventional method. This result suggests that NIR spectroscopy is applicable to the prediction of growth rate in the solid culture and gives a useful method for the control of mushroom production.

scholarly journals Atmospheric carbon gases retrieved from SCIAMACHY by WFM-DOAS: improved global CO and CH<sub>4</sub> and initial verification of CO<sub>2</sub> over Park Falls (46° N, 90° W)

2006 ◽  
Vol 6 (1) ◽  
pp. 363-399 ◽  
Author(s):  
R. de Beek ◽  
M. Buchwitz ◽  
S. Noël ◽  
J. P. Burrows ◽  
H. Bovensmann ◽  
...  
Keyword(s):  
Near Infrared ◽  
Model Simulation ◽  
Detailed Comparison ◽  
Infrared Region ◽  
Emission Inventories ◽  
Model Simulations ◽  
Data Products ◽  
Atmospheric Carbon ◽  
Carbon Gases ◽  
Good Agreement

Abstract. The three carbon gases carbon monoxide (CO), carbon dioxide (CO2), and methane (CH4) are important atmospheric constituents affecting air quality and climate. The nadir spectra of reflected and scattered solar radiation in the near-infrared region, as observed by SCIAMACHY/ENVISAT, contain information on the vertical columns of these gases. A modified DOAS algorithm (WFM-DOAS) has been developed to retrieve this information. The main SCIAMACHY/WFM-DOAS data products are CO vertical columns and dry-air column averaged mixing ratios of methane and CO2, denoted XCH4 and XCO2, respectively. For CO and methane we present new results obtained with an improved version of WFM-DOAS (v0.5). The SCIAMACHY data products have been compared with global reference data (MOPITT for CO, TM5 model simulations for XCH4). The comparisons indicate that major problems of the previous version of WFM-DOAS (v0.4x) related to the varying ice-layer on the SCIAMACHY channel 8 detector have been solved. On average, the SCIAMACHY CO agrees within 10% (standard deviation 30%) with MOPITT but regionally, especially over northern South America, large differences have been found (up to about 80%). For methane we present global and regional maps which are compared to TM5 model simulations performed using standard emission inventories. Overall, there is good agreement but regionally there are substantial differences, e.g., due to limitations of current methane emission inventories. It still needs to be assessed by how much emission inventories can be improved by using the SCIAMACHY data. Concerning CO2 we present a comparison of SCIAMACHY XCO2 (WFM-DOAS v0.4) with TM3 model simulations over Park Falls, Wisconsin, USA. The peak-to-peak XCO2 variability as measured by SCIAMACHY (seasonal cycle of year 2003–2005 data) is ~13 ppmv, in good agreement with preliminary analysis of ground-based Fourier Transform Spectrometer (FTS) measurements, which is a factor of 2.3 larger than the XCO2 variability of TM3 model simulation for 2003. Park Falls is one of the few FTS ground stations which measure column averaged CO2 and detailed comparison with these measurements (after data release) will help identifying the reason for the observed differences between SCIAMACHY and global (atmospheric) carbon models such as TM3 as reported here and in previous studies. For all three carbon gases we present regional results including seasonal variation focusing on China.

Estimation of wood stiffness of increment cores by near-infrared spectroscopy

2002 ◽  
Vol 32 (1) ◽  
pp. 129-135 ◽  
Author(s):  
L R Schimleck ◽  
R Evans ◽  
J Ilic ◽  
A C Matheson
Keyword(s):  
Near Infrared ◽  
Nir Spectroscopy ◽  
Radiata Pine ◽  
Radial Variation ◽  
Wood Stiffness ◽  
Test Sets ◽  
Longitudinal Modulus ◽  
J 51 ◽  
Eucalyptus Delegatensis ◽  
Good Agreement

The use of calibrated near-infrared (NIR) spectroscopy for predicting the radial variation of the longitudinal modulus of elasticity (EL) of increment cores is described. Sets of Eucalyptus delegatensis R.T. Baker (alpine ash) and Pinus radiata D. Don (radiata pine) samples were characterized in terms of EL(SS) (estimated stiffness based on a combination of SilviScan-2 diffractometric data and measured density (R. Evans and J. Ilic. 2001. For. Prod. J. 51(3): 53–57)). NIR spectra, obtained from the radial–longitudinal face of each sample, were used to develop EL(SS) calibrations for the E. delegatensis and P. radiata sample sets and the two sets combined. The relationships between laboratory-determined EL(SS) and NIR-fitted EL(SS) were good in all cases. EL(SS) was estimated in separate test sets and found to correlate well with measured EL. NIR spectra were obtained in 15-mm sections from the radial–longitudinal face of two intact P. radiata increment cores. EL(SS) of each section was estimated using the P. radiata and the combined P. radiata and E. delegatensis calibrations. NIR estimates of EL(SS) were in good agreement with SilviScan-2 determined stiffness indicating that NIR spectroscopy can be successfully used to estimate radial variation in wood stiffness of increment cores.

Spectroscopic Investigation of γ-LiAlO2 Ceramic Doped with Tetrahedrally Coordinated Cr3+ Ions

2013 ◽  
Vol 785-786 ◽  
pp. 701-705
Author(s):  
Jian Ma
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Factor Model ◽  
Infrared Region ◽  
Experiment Data ◽  
Crystal Field Theory ◽  
Microwave Furnace ◽  
Calculation Results ◽  
Multi Mode ◽  
Good Agreement

The γ-LiAlO2: Cr3+ ceramics were successfully fabricated using multi-mode cavity microwave furnace, and the samples absorption spectrum was measured at room temperature. There are five bands in the red and near-infrared region. Using the crystal-field theory and introducing the average covalent factor model, we calculated the energy-level splitting of Cr3+ ions in γ-LiAlO2 and successfully explained these bands. These calculation results are in good agreement with the optical experiment data.

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