Humidity measurement is one of the most
significant issues in various areas of applications such as instrumentation,
automated systems, agriculture, climatology and GIS. Numerous sorts of humidity sensors fabricated and developed for industrial and laboratory applications are
reviewed and presented in this article.
The survey frequently concentrates on the RH
sensors based upon their organic and inorganic functional materials, e.g.,
porous ceramics (semiconductors), polymers, ceramic/polymer and electrolytes,
as well as conduction mechanism and fabrication technologies. A significant aim
of this review is to provide a distinct categorization pursuant to state of the
art humidity sensor types, principles of work, sensing substances, transduction
mechanisms, and production technologies.
Furthermore, performance characteristics of the
different humidity sensors such as electrical and statistical data will be
detailed and gives an added value to the report. By comparison of overall
prospects of the sensors it was revealed that there are still drawbacks as to
efficiency of sensing elements and conduction values. The flexibility offered
by thick film and thin film processes either in the preparation of materials or
in the choice of shape and size of the sensor structure provides advantages
over other technologies. These ceramic sensors show faster response than other
types.
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