Optically defined modal sensors incorporating spiropyran-doped liquid crystals with piezoelectric sensors

Kuan Ting Chen, Chin Kai Chang, Hui Lung Kuo, Chih Kung Lee

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

We integrated a piezoelectric sensing layer lamina containing liquid crystals (LC) and spiropyran (SP) in a LC/SP mixture to create an optically reconfigurable modal sensor for a cantilever beam. The impedance of this LC/SP lamina was decreased by UV irradiation which constituted the underlying mechanism to modulate the voltage externally applied to the piezoelectric actuating layer. Illuminating a specific pattern onto the LC/SP lamina provided us with a way to spatially modulate the piezoelectric vibration signal. We showed that if an UV illuminated pattern matches the strain distribution of a specific mode, a piezoelectric modal sensor can be created. Since UV illumination can be changed in situ in real-time, our results confirm for the first time since the inception of smart sensors, that an optically tailored modal sensor can be created. Some potential applications of this type of sensor include energy harvesting devices, bio-chips, vibration sensing and actuating devices.

原文English
頁(從 - 到)1810-1818
頁數9
期刊Sensors
11
發行號2
DOIs
出版狀態Published - 2011 二月

All Science Journal Classification (ASJC) codes

  • 分析化學
  • 生物化學
  • 原子與分子物理與光學
  • 儀器
  • 電氣與電子工程

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