Studies on Ultrasonic Power Measurement of Cylindrically Converging Wave based on Self-reciprocity Technique
YU Li-li1,SHOU Wen-de2,3
1.Department of Navigation Science, Shanghai Maritime University, Shanghai 201306, China
2.Shanghai Institute of Ultrasound in Medicine, Shanghai 200233, China
3.Department of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Abstract：A self-reciprocity technique is proposed to measure the ultrasonic power for cylindrical converging wave. This study defines the electro-acoustic parameters of cylindrically converging wave,namely,the reciprocity coefficient,transmission current response,and the voltage sensitivity for the free field. Numerical calculations of reflection and diffraction correction coefficients are discussed. Formulas of ultrasonic power for self-reciprocity technique with cylindrical converging wave are derived. Comparison experiments with radiation force balance (RFB) method shows good agreement. Measuring ultrasonic power via the self-reciprocity technique for cylindrical converging waves is found reasonable and feasible.
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2019, Vol. 40 
