Microelectromechanical Systems (MEMS)

Performance enhancement of an air-coupled multiple moving membrane capacitive micromachined ultrasonic transducer using an optimized middle plate configuration

[+] Author Affiliations
Arezoo Emadi, Douglas Buchanan

University of Manitoba, Faculty of Engineering, Department of Electrical and Computer Engineering, 75 Chancellor’s Circle, Winnipeg R3T 5VR, Canada

J. Micro/Nanolith. MEMS MOEMS. 15(4), 045004 (Dec 20, 2016). doi:10.1117/1.JMM.15.4.045004
History: Received September 24, 2016; Accepted November 21, 2016
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Abstract.  A multiple moving membrane capacitive micromachined ultrasonic transducer has been developed. This transducer cell structure includes a second flexible plate suspended between the transducer top plate and the fixed bottom electrode. The added plate influences the transducer top plate deflection map and, therefore, the transducer properties. Three series of individual air-coupled, dual deflectable plate transducers and two 1×27 element transducer arrays were fabricated using multiuser microelectromechanical systems (MEMS) processes (MUMPs). Each set of transducers included devices with middle plate radii from 22% to 65% of the corresponding transducer top plate radius. The effect of the transducer middle plate configuration has been investigated. Electrical, optical, and acoustic characterizations were conducted and the results were compared with the simulation findings. It was found that the transducer top plate amplitude of vibration is significantly enhanced with a wider middle deflectable plate. The electrical and optical measurement results are shown to be in good agreement with simulation results. The acoustic measurement results indicated a 37% increase in the amplitude of transmitted signal by the 1-MHz air-couple transducer when its middle plate radius was increased by 35%.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Arezoo Emadi and Douglas Buchanan
"Performance enhancement of an air-coupled multiple moving membrane capacitive micromachined ultrasonic transducer using an optimized middle plate configuration", J. Micro/Nanolith. MEMS MOEMS. 15(4), 045004 (Dec 20, 2016). ; http://dx.doi.org/10.1117/1.JMM.15.4.045004


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