【摘要】 超声换能器相控阵已用于聚焦超声治疗的研究和应用已有20多年历史,但其声功率P的测量仍缺乏方便有效简易的测量方法。文章旨在提出一种基于凸球面吸收靶的辐射力天平(Radiation Force Balance, RFB)方法,测量其声功率。理论推导了这种RFB在各种阵元组合下的比值r=P/cF(c为水中声速,F为阵的声束轴方向的总辐射力)。论述了测量各种组合的发射声功率的实施方法和测量程序。为实际的测量系统设计和应用建立了良好的工作基础。更多还原

【Abstract】 The ultrasonic phased array has been used for research and application of focused ultrasonic treatment for at least 20 years. However, due to the complexity of its working modes, there is still lack of simple convenient and effective method to measure the acoustic power transmitted by the phased array. In this paper, a new radiation force balance(RFB) method based on a absorbing target of convex spherical segment is proposed for measuring the output acoustic power of the array. The measurement principle, system and procedures of this method are described, and the ratio r =P/cF for various combinations of array elements is derived, where c is speed of sound in water, P is the output acoustic power and F is the axial radiation force acting on the target, which provides a basis of designing and applying the measurement system.更多还原