Moisture Detection in SWIR

In the SWIR band there are several wavelengths ranges where light is highly absorbed.  These absorption bands enable users to image where water is present.  In this case two liquids are on a grey piece of steel.  One liquid is water and the other is motor oil.  In the visible they are difficult to tell apart.  In the SWIR it is very clear which is water (black) and which is oil (lighter grey than steel).  In the visible band a color camera would have difficulty imaging which liquid is which.  The amount of moisture can be measured by calibrating the amount of light reflected from the given object.  SWIR cameras are used in paper manufacturing to determine the dryness of the paper.

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