【摘要】 研究聚焦超声场的辐射力计算。应用几何声学方法,推导了聚焦超声作用于测试靶上的辐射力通用公式,讨论了全反射靶和全吸收靶上的辐射力。最后给出了应用辐射力法测量高强度聚焦超声装置的声功率的实例,其结果与良热法测得的声功率接近,偏差不大于3%。更多还原

【Abstract】 This paper studies the method of calculating the acoustic power of the focused ultrasonic beam based on the radiation force. The general formula of estimating the radiation forces acting on the partially reflecting targets in the focused ultrasonic field of a spherical zone transducer were derived from the ray acoustics. The effects of radiation forces acting on the totally reflecting and absorbing targets were discussed. A radiation force balance (RFB) for measuring the acoustic power of high intensity focused ultrasound was also established. The difference between the meas-ured value by calorimetry method and that derived using the studied method was found to be less than 3%.更多还原