为了在水中各个特定的轴向距离上得到所需要的环形对称横向超声强度分布,研制出了单电极,单频率,连续波换能器(半径1.9cm,频率1.7MHz 或1.75MHz),这种方法可用于产生各种强度分布。由于环形函数在超声的治疗、诊断以及生物效应实验中有着广泛的应用,因此选用它作为一个主要的目标。根据 Fermi-Dirac 分布定参数的电 In order to obtain the required circular symmetrical transverse ultrasonic intensity distribution at each specific axial distance in water, a single electrode, single frequency, continuous wave transducer (radius 1.9 cm, frequency 1.7 MHz or 1.75 MHz) was developed The method can be used to generate various intensity distributions. As the ring function has a wide range of applications in the treatment of ultrasound, diagnosis and biological effects experiments, it is selected as a major goal. Electricity according to Fermi-Dirac distribution