NIR spectroscopy (also near infrared spectroscopy or NIRS) is a physical analysis technique based on spectroscopy in the short-wave infrared light range. It is primarily equivalent to infrared spectroscopy used in the mid- and far-infrared range (MIR and FIR), but allows the use of other materials and radiation sources and provides easier access and other forms of analysis.
Near infrared or near infrared (NIR) is the region of the electromagnetic spectrum that follows the longer wavelength direction of visible light (VIS) in the range of approximately 780 to 2,500 nm.