Practice for Polyurethane Raw Materials: Determining Hydroxyl Number of Polyols by Near Infrared (NIR) Spectroscopy

2008 ◽  
Author(s):  
Keyword(s):  
Near Infrared ◽  
Raw Materials ◽  
Nir Spectroscopy ◽  
Hydroxyl Number

Industrial Applications of Near-Infrared Chemical Imaging Microscopy

2001 ◽  
Vol 7 (S2) ◽  
pp. 162-163
Author(s):  
EN Lewis ◽  
LH Kidder ◽  
KS Haber
Keyword(s):  
Spatial Distribution ◽  
Near Infrared ◽  
Imaging System ◽  
Raw Materials ◽  
Single Point ◽  
Nir Spectroscopy ◽  
Chemical Imaging ◽  
Industrial Applications ◽  
Chemical Information ◽  
Spatially Resolved

Single point near-infrared (NIR) spectroscopy is used extensively for characterizing raw materials and finished products in a wide variety of industries: polymers, paper, film, pharmaceuticals, paintings and coatings, food and beverages, agricultural products. As advanced industrial materials become more complex, their functionality is often determined by the spatial distribution of their discrete sample constituents. However, conventional single point NIR spectroscopy cannot adequately probe the interrelationship between the spatial distribution of sample components with the physical properties of the sample. to fully characterize these samples, it is necessary to probe simultaneously spatial and chemical heterogeneity and correlate these properties with sample characteristics.Recently, we have developed a novel NIR imaging spectrometer that can deliver spatially resolved chemical information very rapidly. in contrast to conventional, single point NIR spectrometers, the imaging system uses an infrared focal-plane array (FPA) to collect up to 76,800 complete spectra, one for each pixel on the array, in approximately one minute.

scholarly journals Near-Infrared Spectroscopy and Geostatistical Analysis for Modeling Spatial Distribution of Analytical Constituents in Bulk Animal By-Product Protein Meals

2016 ◽  
Vol 71 (3) ◽  
pp. 520-532 ◽  
Author(s):  
José A. Adame-Siles ◽  
Tom Fearn ◽  
José E. Guerrero-Ginel ◽  
Ana Garrido-Varo ◽  
Francisco Maroto-Molina ◽  
...  
Keyword(s):  
Near Infrared ◽  
Raw Materials ◽  
Animal Health ◽  
Real Life ◽  
Nir Spectroscopy ◽  
Geostatistical Analysis ◽  
Structure Characterization ◽  
Sampling Point ◽  
Fiber Optic Probe ◽  
Effective Manner

Control and inspection operations within the context of safety and quality assessment of bulk foods and feeds are not only of particular importance, they are also demanding challenges, given the complexity of food/feed production systems and the variability of product properties. Existing methodologies have a variety of limitations, such as high costs of implementation per sample or shortcomings in early detection of potential threats for human/animal health or quality deviations. Therefore, new proposals are required for the analysis of raw materials in situ in a more efficient and cost-effective manner. For this purpose, a pilot laboratory study was performed on a set of bulk lots of animal by-product protein meals to introduce and test an approach based on near-infrared (NIR) spectroscopy and geostatistical analysis. Spectral data, provided by a fiber optic probe connected to a Fourier transform (FT) NIR spectrometer, were used to predict moisture and crude protein content at each sampling point. Variographic analysis was carried out for spatial structure characterization, while ordinary Kriging achieved continuous maps for those parameters. The results indicated that the methodology could be a first approximation to an approach that, properly complemented with the Theory of Sampling and supported by experimental validation in real-life conditions, would enhance efficiency and the decision-making process regarding safety and adulteration issues.

scholarly journals Review: NIR Spectroscopy as a Suitable Tool for the Investigation of the Horticultural Field

Agronomy ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 503 ◽  
Author(s):  
Cattaneo ◽  
Stellari
Keyword(s):  
Chemical Composition ◽  
Process Control ◽  
Water Absorption ◽  
Near Infrared ◽  
Raw Materials ◽  
Nir Spectroscopy ◽  
Innovative Approach ◽  
Different Types ◽  
Key Issues ◽  
Horticultural Products

The last 10 years of knowledge on near infrared (NIR) applications in the horticultural field are summarized. NIR spectroscopy is considered one of the most suitable technologies of investigation worldwide used as a nondestructive approach to monitoring raw materials and products in several fields. There are different types of approaches that can be employed for the study of key issues for horticultural products. In this paper, an update of the information collected from the main specific International Journals and Symposia was reported. Many papers showed the use of NIR spectroscopy in the horticultural field, and the literature data were grouped per year, per product, and per application, such as studies of direct (chemical composition) and indirect (physical and sensorial) properties (P), process control (PC), and authenticity and classification studies (AC). A mention was made of a recent innovative approach that considers the contribution of water absorption in the study of biological systems.

Qualification of Solid Raw Materials Using near Infrared Spectroscopy

1998 ◽  
Vol 6 (A) ◽  
pp. A231-A237 ◽  
Author(s):  
Regis Cinier ◽  
Jean Guilment
Keyword(s):  
Near Infrared ◽  
Raw Materials ◽  
Nir Spectroscopy ◽  
Quantitative Information ◽  
Multidimensional Space ◽  
Global Evaluation ◽  
Good Ability ◽  
Identification Technique ◽  
And Control ◽  
Good Calibration

In order to get a final product which always has the same properties, it is very important to understand and control the manufacturing process but it also implies that the starting materials must be perfect. Perfection does not exist and so it is necessary to determine the purity of the material or to be sure it is always the same from batch to batch. Near infrared (NIR) spectroscopy is known for its good ability to identify compounds as it is mentioned in a lot of publications. For the quantification of solids, the problem becomes harder involving reference techniques which are very often less precise and accurate than NIR measurement. However, in the case of moisture, gravimetric technique is sufficiently precise to get a good calibration. The main advantage of the quantification is the power of the methods to predict the results ‘you want to have’. Its drawback is that when a parameter not included in the calibration set is modified, it may have an impact on the global evaluation. Another approach for raw materials is the qualification combining both the identification technique and send quantitative information. Qualification is based on the construction of clusters in a multidimensional space assuming that we use a number of different batches representative of the whole required variability to be measured. These different approaches will be illustrated with examples of compounds used in the photographic industry.

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