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Near infrared uses the band of radiation between the infrared and the visible. The advantages of operating in this region are that detectors are much more sensitive than in the infrared and the choice of optical materials is less restrictive. Glass transmits near infrared radiation and chemical processes cam be monitored remotely via fibre optic links. Also, interferences from solvents and other matrices are less. Consequently, near infrared spectroscopy forms the basis for a large number of industrial process monitoring, including food and pharmaceutical manufacture. Amongst its other advantages, near infrared radiation penetrates deeply and harmlessly into tissue, adding a new dimension to in-vivo investigations.
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