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Near infra-red spectroscopy [Full subscriber]

Some basic principles In an excellent article Davies (2018) noted that when one holds one’s hand out to a burning fire one “feels” heat being emitted.  The fire gives out light and near infrared (NIR) radiation. Some of the NIR is absorbed by water molecules in one’s skin, raising the temperature of the water. This increases the temperature in surrounding tissues which is detected by nerves in the skin. NIR was discovered in 1800 by William Herschel, because he wanted to know if any particular colour was associated with heat from sunlight. He found that the heat maximum was beyond…

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