30 March 2006 Safety and security monitoring of dams using nano-micromachined-based surface acoustic wave (SAW) sensors
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Concerns about the safety of concrete dams have increased during recent years, partly because the population at risk in locations downstream of major dams continues to expand and also because these old dams are experiencing long-term damage and the seismic design concepts used to build them were inadequate. Reliable techniques for continuous monitoring of certain key parameters affecting the dams' integrity are currently nonexistent and this is because of the lack of sensing technology capable to function in a hostile environment such as low temperatures and high moisture level. This paper presents new low cost, passive and wireless micro-machined SAW-based sensors to monitor the safety and security of dams. These SAW sensors are composed of MEMS transducers, Nano-polymer actuators and an antenna, and are deposited on a thin film substrate. The sensors are passive, do not require power on-board and can be interrogated wireless using a radar. When embedded into concrete dams, the devices will be able to detect and locate internal cracks and measure certain key parameters affecting the durability of dams such as temperature, moisture, pH, chloride and carbon dioxide.
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Wayne Ross, Wayne Ross, Mohamed Saafi, Mohamed Saafi, Peter Romine, Peter Romine, Zhigang Xiao, Zhigang Xiao, David Pett, David Pett, } "Safety and security monitoring of dams using nano-micromachined-based surface acoustic wave (SAW) sensors", Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61670F (30 March 2006); doi: 10.1117/12.657664; https://doi.org/10.1117/12.657664

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