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Development and Evaluation of a Close-Proximity, Real Time Thermoacoustic Ultrasound Sensor Open Access


Other title
Ultrasound Calibration
Ultrasound Sensor
Thermoacoustic Sensor
Type of item
Degree grantor
University of Alberta
Author or creator
Choi, Michael
Supervisor and department
Chen, Jie (Electrical and Computer Engineering)
Examining committee member and department
Chen, Jie (Electrical and Computer Engineering)
Cook, Al (Speech Pathology and Audiology)
Zemp, Roger (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Biomedical Engineering
Date accepted
Graduation date
Master of Science
Degree level
A close proximity, real time thermoacoustic sensor was designed, tested, and implemented in the SonaCell ultrasound generator. When placed in contact with the SonaCell ultrasound transducer, a copper backed plexiglass absorber converted ultrasound energy into heat, where it was measured by a thermistor on the back face of the absorber. A transient model was used to calculated ultrasound intensity from temperature data by fitting the curve T_ave=C(1-e^((-t)/τ) )+ T_0 to the measured data using a least squares method and relating the coefficient C to the applied ultrasound intensity. Over an ultrasound intensity range of 30 mW/cm^2 to 100 mW/cm^2 the thermoacoustic sensor was able to calculate ultrasound intensities with an average error of 8.38% and a maximum observed standard deviation of 5.00 mW/cm^2 when compared to measurements made with a radiation force balance. Analysis of the model and a full evaluation of the designed sensor was carried out.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Michael Choi, Woon Ang, Jie Chen. Close-Proximity, Real-Time Thermoacoustic Sensors: Design, Characterization, and Testing. IEEE International Symposium on Circuits and Systems (2012)

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