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Sensors 2010, 10(5), 4270-4280; doi:10.3390/s100504270

Monitoring of Water Content in Building Materials Using a Wireless Passive Sensor

Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia
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Received: 27 February 2010 / Revised: 20 March 2010 / Accepted: 6 April 2010 / Published: 28 April 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

This paper describes an innovative design of a wireless, passive LC sensor and its application for monitoring of water content in building materials. The sensor was embedded in test material samples so that the internal water content of the samples could be measured with an antenna by tracking the changes in the sensor’s resonant frequency. Since the dielectric constant of water was much higher compared with that of the test samples, the presence of water in the samples increased the capacitance of the LC circuit, thus decreasing the sensor’s resonant frequency. The sensor is made up of a printed circuit board in one metal layer and water content has been determined for clay brick and autoclaved aerated concrete block, both widely used construction materials. Measurements were conducted at room temperature using a HP-4194A Impedance/Gain-Phase Analyzer instrument.
Keywords: LC sensor; wireless; humidity; building materials LC sensor; wireless; humidity; building materials
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Stojanović, G.; Radovanović, M.; Malešev, M.; Radonjanin, V. Monitoring of Water Content in Building Materials Using a Wireless Passive Sensor. Sensors 2010, 10, 4270-4280.

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