An all-printed wireless humidity sensor label

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• 作者：Xiaodong Wang^a  ; [Author Vitae] ; Oscar Larsson^a  ; [Author Vitae] ; Duncan Platt^b  ; [Author Vitae] ; Staffan Nordlinder^c  ; [Author Vitae] ; Isak Engquist^a ; ^{isak.engquist@liu.se}  ; [Author Vitae] ; Magnus Berggren^a  ; [Author Vitae] ; Xavier Crispin^a  ; [Author Vitae]
• 关键词：Printed humidity sensor label ; Wireless sensor ; Polyelectrolyte ; Dry-phase patterning ; Resonance
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：20 May, 2012
• 卷：166-167
• 期：Complete
• 页码：556-561
• 文件大小：738 K

摘要

Printed electronics promise various kinds of sensor circuit labels, for applications in distributed sensing and monitoring, which can be manufactured using traditional printing tools at very low cost. Elevated humidity levels or water leakages cause tremendous costs in our society, such as in construction industries and in transportations. Distributed monitoring and remote sensing of the humidity level inside walls of buildings and packages is therefore desired and urgently needed. Here, we report a wireless humidity sensor label that is manufactured using screen-printing and dry-phase patterning. The sensor label includes a planar antenna, a tuning capacitor and a printed sensor-capacitor head. Through electromagnetic coupling between a reader and the printed sensor label, changes in humidity level were remotely detected and read-out as a shift of the resonant frequency. The manufacturing process of the humidity sensor label is fully compatible with inexpensive, reel-to-reel processing technologies, thus enabling low cost production.