In conventional devices, e.g., non-dispersive infrared spectroscopy (NDIR), 11,12 11. The implementation of the infrared spectroscopy requires four essential components: light source, sensing part, spectral filter, and photodetector. ![]() Consequently, infrared spectroscopy enables us to detect the analytes remotely, label-free, and selectively, which is advantageous over other methods. The absorption spectra of molecules are directly linked to their constituents, chemical bonds, and configuration. The major uniqueness of this technology lies in its ability to detect the rich information on the light–matter interaction in the infrared range, also known as the absorption “fingerprint” of molecules. ![]() Stuart, in Kirk-Othmer Encyclopedia of Chemical Technology ( John Wiley & Sons, Inc., Hoboken, NJ, 2015), pp. Infrared spectroscopy is of critical importance for many scientific and technological advances, including environment monitoring, pharmacy, chemical analysis, and biosensing.
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