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Sensors 2011, 11(5), 4609-4621; doi:10.3390/s110504609
Article

An Electronic-Nose Sensor Node Based on a Polymer-Coated Surface Acoustic Wave Array for Wireless Sensor Network Applications

* ,
 and
Department of Electrical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
* Author to whom correspondence should be addressed.
Received: 3 February 2011 / Revised: 17 February 2011 / Accepted: 7 April 2011 / Published: 28 April 2011
(This article belongs to the Special Issue Direct and Indirect Sensing of Odor and VOCs and Their Control)
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Abstract

This study developed an electronic-nose sensor node based on a polymer-coated surface acoustic wave (SAW) sensor array. The sensor node comprised an SAW sensor array, a frequency readout circuit, and an Octopus II wireless module. The sensor array was fabricated on a large K2 128° YX LiNbO3 sensing substrate. On the surface of this substrate, an interdigital transducer (IDT) was produced with a Cr/Au film as its metallic structure. A mixed-mode frequency readout application specific integrated circuit (ASIC) was fabricated using a TSMC 0.18 μm process. The ASIC output was connected to a wireless module to transmit sensor data to a base station for data storage and analysis. This sensor node is applicable for wireless sensor network (WSN) applications.
Keywords: electronic nose; wireless sensor network; sensor node; SAW sensor array electronic nose; wireless sensor network; sensor node; SAW sensor array
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tang, K.-T.; Li, C.-H.; Chiu, S.-W. An Electronic-Nose Sensor Node Based on a Polymer-Coated Surface Acoustic Wave Array for Wireless Sensor Network Applications. Sensors 2011, 11, 4609-4621.

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