Abstract
Sensors are needed by the food industry to facilitate remote sensing of moisture during food production processes such as baking and drying. These sensors should provide high sensitivity, have a fast and reversible response, be suitable to high-temperature environments and applicable to gas-phase systems, have a reasonably long service life, and be inexpensive. Optical sensors have inherent advantages for remote sensing and continuous monitoring. Optical sensors using absorption-based dye-doped fibers,1 NIR spectroscopy,2,3 and fluorescence measurements4 have been reported. However optical sensors suitable for high-temperature humidity detection are not seen in commercial instruments and have not been extensively reported in the literature.
© 1995 Optical Society of America
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