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Design and Development of Semi Cylindrical Capacitive Type Humidity Sensor

Publication Date : 28/08/2015



Author(s) :

Debashis Mahata , Sagarika Pal.


Volume/Issue :
Volume 2
,
Issue 8
(08 - 2015)



Abstract :

An air capacitor changes its capacitance with the variation of moisture in air and can be used as a humidity sensor by measuring capacitance change. Differing from the structure of parallel plate capacitive sensor, a semi cylindrical capacitive sensor with open air as dielectric has been introduced in this present work to measure the humidity content within the air. In this work the semi cylindrical capacitive sensor consists of two thin semi cylindrical copper sheets separated by a gap distance and mounted around a PVC pipe containing air with moisture. As the humidity in the air changes, amount of moisture in the air changes and hence the capacitance of the semi cylindrical capacitor also changes.  The changes of capacitance with the variation of moisture in air have been measured by using an LCR impedance meter. The variation of capacitance has been obtained in the nano farad (nF) range. The measured capacitance has been converted into voltage variation by using proper signal conditioning circuit.  The characteristic curve obtained shows that the humidity and capacitance change has linear relation. The experimental results show that it has a fast response time, high reliability and high repeatability.


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Design and Development of Semi Cylindrical Capacitive Type Humidity Sensor

August 27, 2015