Optimizing piezo-resistive strain gauge characteristics for intelligent strain sensing applications

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Title Optimizing piezo-resistive strain gauge characteristics for intelligent strain sensing applications
Author Macnamara, Dwain Seton; Thiel, David Victor; James, Daniel Arthur; Lisner, Peter Charles
Publication Title SPIE International Symposium on Microelectronics, MEMs and Nanotechnology
Editor Alex J. Hariz
Year Published 2005
Place of publication USA
Publisher SPIE
Abstract This paper reviews current piezo-resistive characteristics pertaining to conventional and novel piezo-resistive strain transducers. These characteristics govern the performance of the sensor node. In this application, low power consumption, high signal to noise ratio (SNR), sensitivity and resolution in the sensor node are optimized for a distributed sensor network. In this low frequency application at < 100 Hz, it is found that electrical noise can limit the nominal resistance of the strain gauge to be used. By reducing the nominal resistance to lower the SNR, power consumption is increased. Optimization of the nominal resistance for excess noise and other material parameters must take place. Typical values have been used to explore the SNR over a range of resistance values and against frequency. The trade-off is also optimized in the volume and sheet resistance of the piezo-resistive material. Irreversible phenomena such as ageing and material creep are responsible for very low frequency drift (approaching DC) with respect to time and temperature. It is found that this drift is material specific and can be numerically compensated in situ. Maximizing sensitivity of the transducer is desirable to reduce the overhead at the sensor front-end. This overhead is shown to be dependant on gauge factor and the configuration of the strain-sensing circuit. The configuration of the strain-sensing circuit impacts on cost, complexity and SNR.
Peer Reviewed Yes
Published Yes
Publisher URI http://spiedl.aip.org/dbt/dbt.jsp?KEY=PSISDG&Volume=6035&Issue=1
Alternative URI http://dx.doi.org/10.1117/12.650131
Conference name Microelectronics: Design, Technology and Packaging II
Location Brisbane
Date From 2005-12-12
Date To 2005-12-14
URI http://hdl.handle.net/10072/2619
Date Accessioned 2006-01-30
Language en_AU
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Integrated Circuits
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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