Title :
Electromagnetic humidity sensor for industrial applications
Author :
Vainikainen, P.V. ; Agarwal, R.P. ; Nyfors, E.G. ; Toropainen, A.P.
Author_Institution :
Helsinki University of Technology, Radio Laboratory, Espoo, Finland
Abstract :
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.
Keywords :
cavity resonators; electric sensing devices; humidity measurement; microwave measurement; perturbation techniques; signal processing equipment; dirt; dust; electromagnetic humidity sensor; industrial applications; microwave resonator; oil vapours; resonance perturbation technique; sensor signal processing circuit;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860674
