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

Sensors

Goran Stojanović¹  Milan Radovanović²  Mirjana Maleᘞv² 

[1] Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia;

关键词: LC sensor;    wireless;    humidity;    building materials;   

DOI  :  10.3390/s100504270

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.