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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Johan, S. Xuezhi Zeng Unander, T. Koptyug, A. Nilsson, H.-E. |
| Copyright Year | 2007 |
| Description | Author affiliation: Mid Sweden Univ., Sundsvall (Johan, S.; Xuezhi Zeng; Unander, T.) |
| Abstract | The paper presents a concept where pairs of ordinary RFID tags are exploited for use as remotely read moisture sensors. The pair of tags is incorporated into one label where one of the tags is embedded in a moisture absorbent material and the other is left open. In a humid environment the moisture concentration is higher in the absorbent material than the surrounding environment which causes degradation to the embedded tag's antenna in terms of dielectric losses and change of input impedance. The level of relative humidity or the amount of water in the absorbent material is determined for a passive RFID system by comparing the difference in RFID reader output power required to power up respectively the open and embedded tag. It is similarly shown how the backscattered signal strength of a semi-active RFID system is proportional to the relative humidity and amount of water in the absorbent material. Typical applications include moisture detection in buildings, especially from leaking water pipe connections hidden beyond walls. Presented solution has a cost comparable to ordinary RFID tags, and the passive system also has infinite life time since no internal power supply is needed. The concept is characterized for two commercial RFID systems, one passive operating at 868 MHz and one semi-active operating at 2.45 GHz. |
| Starting Page | 308 |
| Ending Page | 311 |
| File Size | 566733 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424412617 |
| ISSN | 19300395 |
| DOI | 10.1109/ICSENS.2007.4388398 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-10-28 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Moisture RFID tags Radiofrequency identification Dielectric materials Passive RFID tags Dielectric losses Humidity Degradation Impedance Power generation |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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