Survey of the development of near-infrared spectroscopy instruments

The technology of neat-infrared spectroscopic analysis goes by the name of "superman" in the field of analytical chemistry. It is one of the most attention-attracting spectroscopic analysis technologies, and is developing rapidly nowadays. The first near-infrared spectroscopy (NIRS) instrument in the world is fifty years old. Although the authors only have a history of twenty years in NIRS instrument manufacturing, the achievements are exciting. The NIRS instruments are developing and emerging endlessly with the advancement of science. Firstly, the survey of the development of NIRS instruments is described in the present article. Secondly, the principles and the characteristics of five types of NIRS instruments are discussed, including interference filters, Fourier transform, acousto-optic tunable filter, and so on. In addition, the primary producers and their popular products are enumerated in the table. Finally, the direction of NIRS instrument development is viewed.