Near-infrared spectroscopy advantages

Near-infrared Spectroscopy. Near-infrared spectroscopy (NIRS) uses that part of the electromagnetic spectrum between the visible and the infrared. This region has the advantage that the instrumentation is nearest to visible instrumentation. Signals in the near-infrared come not from the fundamental vibrations of molecules but from overtones. As... 

Near-infrared spectroscopy (NIR) works in the 800 nm-2.5 pm (12,500— 4,000 cm-1) range. The advantage of NIR is that it can typically penetrate much farther into a sample than the mid-infrared radiation (30-1.4 pm, 4,000-400 cm-1)- It can be used for the quantitative measurement of organic functional groups of soil organic matter, especially O—H, N—H, and C=0 (Siesler et al. 2002). In addition, the structural modifications under the effect of chemical treatments (e.g., acidic treatments) can also be studied by NIR (Madejova et al. 2009). 

Previous work of one of the authors dealt with mid IR monitoring of IB polymerization using fiber-optic equipment. Fourier transform near infrared spectroscopy can be accomplished without expensive hardware. It therefore seemed to be a desirable goal to combine the advantage of fiber optics with low-cost fibers available for measurements in the NIR range. The NIR spectrum of IB obtained after solvent subtraction (Figure 2) reveals at least three signals, which should be suitable for the determination of monomer conversion. 

Tremendous advances have been made recently in the use of near-infrared spectroscopy for the analysis of pharmaceutical dosage forms. Just 25 years ago, near-infrared spectroscopy was used in a way that offered relatively few advantages over other analytical methods for the analysis of dosage... 

In many ways, near-infrared spectroscopy is an ideal method for pharmaceutical process control, particularly for the analysis of intact dosage forms. As production costs, including analytical expenses, continue to increase, the advantages of NIR spectroscopy will become more attractive. With near-infrared spectroscopy, the pharmaceutical industry will move one step closer to zero-defect quality control, making the costs associated with the method s development well spent. 

G. Lachenal, Y.Ozald. Advantage of near infrared spectroscopy for the analysis of polymers and composites. Macromol Symp 141 283, 1999. 

N. B. Buchmann, I. A. Cowe. Advantages of using artificial neural networks techniques for agricultural data. Near Infrared Spectroscopy Proceedings of the 10th International Conference, A. M. C. Davies, R. K. Cho, eds. NIR Publications, Chichester, UK, 71-75,... 

Fourier transform near-infrared spectroscopy, using the C=CH band at 61S2cm for methacrylates, enabled the conversion to be followed in a single sample throughout the polymerization to high conversion. Parallel experiments were performed for near-infrared spectroscopic determination of monomer concentrations and for ESR measurements of radical concentrations. A further advantage of the near-IR method is its applicability to insoluble crosslinked systems. 

Finally, in the field of full-spectrum NIRS methods, Fourier transform near-infrared (FTIR) analyzers are included (Figure 5.5). FTIR techniques are predominant in mid-infrared spectroscopy because there are clear and absolute advantages for the FTIR analyzer in the mid-infrared compared with any other available technology. This arises because of the low power output of mid-infrared sources and the low specific detectivity... 

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