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Detection of water-ice transition using a lead zirconate titanatebrass Xiaoping Li and Wan Y. Shiha)
 

Summary: Detection of water-ice transition using a lead zirconate titanate’brass
transducer
Xiaoping Li and Wan Y. Shiha)
Department of Materials and Engineering, Drexel University, Philadelphia, Pennsylvania 19104
James Vartuli, David L. Milius, Robert Prud'homme, and Ilhan A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544
Wei-Heng Shih
Department of Materials and Engineering, Drexel University, Philadelphia, Pennsylvania 19104
Received 21 November 2001; accepted for publication 2 April 2002
We have examined experimentally and theoretically the resonance frequency of a lead zirconate
titanate PZT /brass unimorph disk transducer with a water ice layer on the brass surface. We
showed that the flexural resonance frequency decreased with the presence of a water layer and the
decrease in resonance frequency increased with an increasing water amount. Upon lowering the
temperature, the freezing transition of the deposited water layer was detected when the resonance
frequency of the transducer increased abruptly at the freezing temperature. In contrast to water, an
ice layer increased the resonance frequency and the increase in the resonance frequency increased
with the ice layer thickness. Theoretically, an analytic expression for the flexural resonance
frequency of a unimorph transducer in the presence of an ice water layer on the brass surface was
obtained in terms of the Young's moduli, densities, and thickness of the PZT, brass, and ice water

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science