基于自易校准技术的柱面会聚波超声功率测量研究

基于自易校准技术研究了柱面会聚波超声功率的测量方法。首先从定义柱面会聚波的互易常数、自由场发送电流响应及电压灵敏度等电声特性参数开始,重点讨论了反射系数及衍射修正系数的计算方法,推导了凹圆柱面聚焦换能器声功率自易测量计算的表达式。然后,将实测结果与辐射力法的测量结果比较取得很好的一致性。通过实验证明了自易校准法应用于柱面会聚波超声功率测量的合理性和可行性。

Studies on Ultrasonic Power Measurement of Cylindrically Converging Wave based on Self-reciprocity Technique

A self-reciprocity technique is proposed to measure the ultrasonic power for cylindrical converging wave. This study defines the electro-acoustic parameters of cylindrically converging wave,namely,the reciprocity coefficient,transmission current response,and the voltage sensitivity for the free field. Numerical calculations of reflection and diffraction correction coefficients are discussed. Formulas of ultrasonic power for self-reciprocity technique with cylindrical converging wave are derived. Comparison experiments with radiation force balance (RFB) method shows good agreement. Measuring ultrasonic power via the self-reciprocity technique for cylindrical converging waves is found reasonable and feasible.