Near Infrared Spectroscopy
Near infrared spectroscopy (NIR) (~800 – 2500 nm) is utilized to study molecular overtone and combination vibrations and is commonly applied to study the quality of ingredients from food, agrochemical, textile, and pharmaceutical industries. Due to the larger penetration depths of this technique compared to mid-infrared and Raman spectroscopy, NIR spectroscopy is useful for probing bulk materials and assessing quality with little to no sample preparation. The results of this method can be coupled with other vibrational spectroscopy methods such as visible, ultraviolet and mid-infrared to assist with development of quality control indicators by correlating specific, known properties of a material to NIR spectral properties.
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