Abstract
In this paper, we establish a new type of passive ultra-high-frequency (UHF) radio frequency identification (RFID) technology-based moisture sensor. The sensor system consists of a sensor tag and a reference tag to indicate exposure to moisture. The sensor tag is fabricated on a cotton substrate from conductive silver yarn and water-soluble polyvinyl alcohol (PVA) yarn. When the sensor is exposed to water, the PVA yarn will melt, which causes a permanent change to the tag antenna body and to the wireless performance of the sensor tag. By measuring the backscattered power strength difference, $\Delta \text{P}$ , the presence of moisture can be detected and recorded. When $\Delta \text{P}$ is below 0, the sensor system shows that it has been in a highly moist condition. Our PVA-based moisture-sensing system can provide cost-effective and maintenance-free monitoring of moisture exposure for versatile application fields.
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