Biomedical Microdevices

, Volume 10, Issue 1, pp 47–54

A flexible surface wetness sensor using a RFID technique

  • Cheng-Hao Yang
  • Jui-Hung Chien
  • Bo-Yan Wang
  • Ping-Hei Chen
  • Da-Sheng Lee
Article

DOI: 10.1007/s10544-007-9108-9

Cite this article as:
Yang, CH., Chien, JH., Wang, BY. et al. Biomed Microdevices (2008) 10: 47. doi:10.1007/s10544-007-9108-9

Abstract

This paper presents a flexible wetness sensor whose detection signal, converted to a binary code, is transmitted through radio-frequency (RF) waves from a radio-frequency identification integrated circuit (RFID IC) to a remote reader. The flexible sensor, with a fixed operating frequency of 13.56 MHz, contains a RFID IC and a sensor circuit that is fabricated on a flexible printed circuit board (FPCB) using a Micro-Electro-Mechanical-System (MEMS) process. The sensor circuit contains a comb-shaped sensing area surrounded by an octagonal antenna with a width of 2.7 cm. The binary code transmitted from the RFIC to the reader changes if the surface conditions of the detector surface changes from dry to wet. This variation in the binary code can be observed on a digital oscilloscope connected to the reader.

Keywords

SensorRFIDFlexibleWetness

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Cheng-Hao Yang
    • 1
  • Jui-Hung Chien
    • 1
  • Bo-Yan Wang
    • 1
  • Ping-Hei Chen
    • 1
  • Da-Sheng Lee
    • 2
  1. 1.Department of Mechanical EngineeringNational Taiwan UniversityTaipeiTaiwan
  2. 2.Department of Energy and Refrigerating Air Conditioning EngineeringNational Taipei University of TechnologyTaipeiTaiwan