subject: Near infrared spectroscopy and its application brief - Near Infrared Spectroscopy, Applied - Education Industry [print this page] Near infrared spectroscopy and its application brief - Near Infrared Spectroscopy, Applied - Education Industry
Near-infrared region is defined by ASTM in the 780 ~ 2526nm wavelength range of electromagnetic waves, is that people first discovered the non-visible spectrum. As the material in the spectral region of weak absorption signal frequency octave harmony, band overlapping, complex analysis, by the time Technology Level of restriction, near infrared spectroscopy "sleeping" for nearly a half century. In recent years, the rapid development of analytical chemistry in the field of high technology, more and more attracted domestic and foreign analysis Expert The eyes, known as the analysis in analytical chemistry "giants", it can be said to have brought the emergence of yet another analysis of technological revolution.
Near Infrared Spectroscopy application areas: Near infrared spectroscopy is mainly reflect the CH, OH, NH, SH and other groups about the sample structure, composition, nature of the information, so the scope of analysis covers almost all the organic compounds and mixtures. Combined with its many unique advantages, the decision of its broad applications, so in many industries can play an important role. Main applications include: oil and petrochemicals, agriculture, tobacco, food, beverage, pharmaceutical, organic chemical, fine chemical, life science, clinical medicine, textile, paper, cosmetics, geography and geology, aviation, remote sensing, quality control , and environmental protection. In the petrochemical field of oil products can be determined octane number, cetane number, flash point, freezing point, freezing point, distillation range, etc.; in agriculture can be measured grain protein, amino acids, sugars, fat, fiber, water and other internal components content and hardness and other properties; in the field of medicine can determine the active ingredients in pharmaceuticals, composition and content; can identify the types of samples, such as liquor and perfumes, true and false identification, such as environmental waste sorting.
NIR features: Application of Near Infrared Spectroscopy way
characteristics: the work of near infrared spectroscopy spectrum region rich amount of information on the sample through the ability to have strong. Near infrared spectroscopy can be measured within a few seconds to complete a spectrum of samples collected measurements, transient mathematical model can be rely on the completion of the determination of many of its performance. Analysis process does not produce pollution, consumes no other material, without destroying the sample, analysis of reproducibility and low cost; can achieve rapid analysis, green analysis, low-cost analysis, with "more, faster, better and cheaper" features. Particularly in complex materials, natural products non-destructive, micro-loss analysis, line analysis, in situ analysis, transient analysis and so can not compare with the conventional analysis of the merits.
Near infrared spectroscopy for quality control and timely analysis of a large number of samples is very economical and fast, since before the establishment of near infrared spectroscopy to be a lot of manpower, material and financial resources to get an accurate calibration model. Therefore, there is no near infrared spectroscopy for the corresponding mathematical model is not applicable to the analysis of sporadic samples.
Near Infrared Spectroscopy is an indirect analysis using a mathematical model is two analytical techniques; generally not suitable for laboratory precision, high stability analysis; near infrared spectroscopy is not suitable for trace analysis.
Near infrared spectroscopy and conventional methods of the different spectra
Usually the basic UV, visible spectroscopy and infrared spectroscopy such as conventional spectroscopy, NIR spectral region because of different information, different methods and instruments with conventional spectral analysis to be very different .
NIR spectral region of the different
Near-infrared spectral region wavelength range between visible light and infrared light, the spectral region of both the rich amount of information in the infrared region and visible spectral region the advantages of ease of use advantages.
Infrared spectral region with the same near-infrared spectroscopy of molecular vibrational information, but this spectral region is mainly harmonic vibration frequency of information and cooperation, analysis of this spectral region can be achieved almost all of the relevant groups with hydrogen samples of chemical properties, physical properties, some of the biological nature of multi-project analysis or both, is considered an "analysis has the potential to address global agriculture," the contemporary analysis.
