Near-infrared spectroscopy
![Near-IR absorption spectrum of dichloromethane showing complicated overlapping overtones of mid IR absorption features.](/Images/godic/202501/29/Dichloromethane_near_IR_spectrum1223.png")
![Near-infrared spectrum of liquid ethanol.](/Images/godic/202501/29/Ethanol_near_IR_spectrum1223.png")
![Infrascanner 1000, a NIRS scanner used to detect intracranial bleeding.](/Images/godic/202501/29/Infrascanner_10001224.jpg")
Near-infrared spectroscopy (NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from about 700 nm to 2500 nm). Typical applications include medical and physiological diagnostics and research including blood sugar, pulse oximetry, functional neuroimaging, sports medicine, elite sports training, ergonomics, rehabilitation, neonatal research, brain computer interface, urology (bladder contraction), and neurology (neurovascular coupling). There are also applications in other areas as well such as pharmaceutical, food and agrochemical quality control, atmospheric chemistry, and combustion research.