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目的 :验证作者所导出的公式对 HIFU终止早孕机的输出声功率测量的准确性。方法 :应用几何声学方法和声叠加原理 ,利用 Beissner的球冠形聚焦换能器的声辐射力公式 ,导出了球台形超声换能器的声辐射力计算公式。并为此设计了一台测量高强度聚焦超声 ( HIFU)终止早孕机的声场的声辐射力的力平衡装置。应用导出的公式测定 HIFU终止早孕机的输出声功率并与量热法测得的同一输出声功率相比。结果 :两种测量方法的同一超声场的声功率 ,偏差小于 3%。结论 :说明所导出的公式是合理的
Objective : To verify the accuracy of the output sound power measurement of HIFU terminated early pregnancy machine by the formula derived by the author. Methods : Applying geometrical acoustic method and sound superposition principle, using Beissner’s spherical-toroidal focused transducer’s formula of acoustic radiation force, the acoustic radiation force formula of the ball-table ultrasonic transducer was derived. For this purpose, a force balance device for measuring the acoustic radiation force of the sound field of the early pregnancy machine with high intensity focused ultrasound (HIFU) was designed. The derived formula was used to determine the output sound power of the HIFU terminated early pregnancy machine and compared to the same output sound power measured by calorimetry. RESULTS: The acoustic power of the same ultrasound field for both measurements was less than 3%. Conclusion : Explain that the derived formula is reasonable