Beissner K
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
J Acoust Soc Am. 2008 Oct;124(4):1941-9. doi: 10.1121/1.2968687.
Knowledge of the theoretical relation between acoustic radiation force and ultrasonic power is important for measuring the emitted power, particularly from medical ultrasonic equipment, using a radiation force balance. A far-field method is applied to calculate the radiation force exerted by rectangular field types on a large absorbing target in a nonabsorbing fluid. This is an extension of previous work on fields with circular symmetry. Pistonlike, apodized, and weakly focusing transducer behavior including diffraction effects is dealt with. If diffraction is neglected, i.e., in the geometric or high-frequency limit, the result can be given as a closed-form expression.
了解声辐射力与超声功率之间的理论关系对于使用辐射力平衡来测量发射功率非常重要，特别是对于医学超声设备。一种远场方法被用于计算矩形场类型在非吸收性流体中的大吸收目标上施加的辐射力。这是先前关于具有圆对称性场的工作的扩展。处理了包括衍射效应的活塞状、变迹和弱聚焦换能器行为。如果忽略衍射，即在几何或高频极限情况下，结果可以表示为一个封闭形式的表达式。
