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本文提出了一种测量超声近场的新设计方案,得到了一些重要的结果。在实验技术方面,我们设计了一种埋于石蜡块中的沿径向排布的热电偶探针组,用来测量超声引起的温升,以确定超声近场的强度分布。这样可以避兔冲流和对流的影响,实现同时多点测量,减少了实验误差。理论方面,我们得到了超声束强度分布的经验公式,指出了分布函数中常数的物理意义,提出了由平均强度求峰强度的方法.我们证明了束分布与平均强度无关的重要结果,这个结果给实验研究带来了巨大方便.
In this paper, a new design scheme for measuring the ultrasonic near-field is proposed and some important results are obtained. In experimental techniques, we designed a radial array of thermocouple probes buried in paraffin blocks to measure the temperature rise induced by ultrasound to determine the intensity distribution of the ultrasound near-field. This avoids the effects of runoff and convection to achieve simultaneous multi-point measurement, reducing experimental error. Theoretically, we obtain the empirical formula of the intensity distribution of the ultrasonic beam, point out the physical meaning of the constant in the distribution function, and propose a method of calculating the peak intensity from the average intensity. We prove the important result that the beam distribution is not related to the average intensity. To the experimental research has brought great convenience.