Humidity is an important physical quantity in all fields of human life. In recent years, fiber-optic humidity sensors with compact size, high sensitivity and good resistance to chemical corrosion and insusceptibility to electromagnetic interference have been widely studied.
Yu Hyong Su, a researcher at the Semiconductor Institute, has proposed a novel optical humidity sensor which is simple in structure, easy to make and cost-effective with high sensitivity, a wide range of operation, and good safety and reproductivity. It consists of light source, a gap and an acrylic resin film coated on PSD.
Experimental results verified very satisfactory performance of the humidity sensor in terms of its sensitivity, hysteresis, linear response to the humidity and long-term stability.
You can find more information about it in his paper “Widely sensitive optical humidity module by using acrylic resin and a position sensitivity detector” published in the SCI Journal “Optical and Quantum Electronics”.
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