Electromagnetic humidity sensor for industrial applications
P. Vainikainen, Rakesh Agarwal, Ebbe G. Nyfors, Anssi P. Toropainen · Electronics Letters · 1986
The letter describes an electromagnetic humidity sensor based on a resonance perturbation technique. The proposed sensor is capable of measuring humidity over a wide dynamic range in an industrial environment and is insensitive to dust, dirt, oil vapours etc. The all-metal construction of the sensor makes it immune to damage by high temperature. The sensor signal processing circuit provides a time-dependent signal which can be directly applied to any modern computerised control systems.