Near infrared spectroscopy
Modern near-infrared spectroscopy (NIR) analysis technology is a high-tech analysis technology that has developed rapidly in the field of analytical chemistry in recent years. It has attracted the attention of analysts at home and abroad. It is hailed as an analytical "giant" in the field of analytical chemistry. Brought yet another revolution in analytical technology.
The near-infrared region is defined by ASTM to refer to electromagnetic waves with a wavelength in the range of 780-2526nm, and is the earliest non-visible light region discovered by people. Due to the weak frequency-doubled and combined-frequency absorption signals of the material in this spectral region, overlapping spectral bands, and complicated analysis, limited by the technical level at that time, the near-infrared spectrum has been "sleeping" for nearly a century and a half. Until the 1950s, with the advent of commercial instruments and the extensive work done by Norris et al., NIR spectroscopy was once widely used in the analysis of agricultural and sideline products. In the mid to late 1960s, with the emergence of various new analytical techniques, coupled with the weaknesses of low sensitivity and poor anti-interference exposed by classic near-infrared spectroscopy, people were indifferent to the application of this technique in analytical testing. , Near infrared spectroscopy has entered a period of silence. In the late 1980s, with the rapid development of computer technology, it led to the development of the digitization of analytical instruments and the development of chemometrics. The good results achieved by chemometrics in solving spectral information extraction and background interference, plus near infrared spectroscopy in measurement The unique characteristics of this kind of technology make people re-recognize the value of near infrared spectroscopy, and the application research of near infrared spectroscopy in various fields has been carried out one after another. In the 1990s, the application of near-infrared spectroscopy in the industrial field has been fully developed. The research and application literature on near-infrared spectroscopy has grown exponentially, becoming the fastest-growing and most compelling independent analysis technology. Because near infrared light has good transmission characteristics in conventional optical fibers, near infrared spectroscopy has also been well applied in the field of online analysis, and has achieved good social and economic benefits. Since then, near infrared spectroscopy technology has entered a rapid development. New period.
The research and application of near infrared spectroscopy technology started late in China. Apart from some professional analysis staff, near infrared spectroscopy analysis technology is still little known. But since 1995 it has received a lot of attention, and has achieved relatively gratifying results in the development of instruments, software development, basic research and application. However, at present, there are still few companies in China that can provide a complete set of near-infrared spectroscopy techniques (near-infrared spectroscopy instruments, chemometrics software, application models). With China's accession to the WTO and the wave of economic globalization, many large foreign analytical instrument manufacturers have landed in China, wanting to occupy China's near-infrared spectroscopy analytical instrument market in the first place. It can also be seen that the near-infrared spectroscopy analysis technology is a hot trend in the analysis world. In the near future, near infrared spectroscopy analysis technology will surely be recognized and accepted by more people in the analysis community.
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