超声波液体密度测量的一种声反射系数测定方法

发布时间：2018-05-18 09:03

本文选题：超声传感器 + 声反射系数　；参考：《传感技术学报》2017年07期

【摘要】：用超声波测液体密度时,测量声反射系数是重点。提出一种将半波层反射模型简化后,利用相对稳态幅度测量声压反射系数的方法。将一个较薄固体作为半波层置于被测液体中,两侧对称地放置超声波换能器,换能器一个工作在脉冲回波模式,另一个工作在接收模式。调整信号频率使半波层和被测液体交界面的多重反射波达到最大程度干涉,此时被测液体与半波层之间的声反射系数只与两个换能器在稳态下的回波信号幅度比值有关。因此测得换能器的稳态回波信号幅度比,即可得到声反射系数。此方法简化了原来的半波层反射模型,采取对称布局,利用相对稳态幅度法,简化了理论推导过程,降低了测量上的精度要求。最后文章通过实验验证了方法的正确性。
[Abstract]:It is important to measure acoustic reflection coefficient when measuring liquid density by ultrasonic wave. This paper presents a method for measuring the reflection coefficient of sound pressure by using the relative steady-state amplitude after simplifying the reflection model of the half-wave layer. A thin solid is placed in the measured liquid as a half-wave layer and the ultrasonic transducer is symmetrically placed on both sides. The transducer works in the pulse echo mode and the other in the receiving mode. By adjusting the frequency of the signal, the multi-reflection wave at the interface between the half-wave layer and the measured liquid reaches the maximum degree of interference. At this time, the acoustic reflection coefficient between the measured liquid and the half-wave layer is only related to the amplitude ratio of the echo signal between the two transducers under steady state. Therefore, the acoustic reflection coefficient can be obtained by measuring the amplitude ratio of steady state echo signal of the transducer. This method simplifies the original half-wave layer reflection model, adopts the symmetrical layout, and uses the relative steady-state amplitude method to simplify the theoretical derivation process and reduce the precision requirement of the measurement. Finally, the correctness of the method is verified by experiments.
【作者单位】：大连理工大学电气工程学院;国网辽宁省电力有限公司电力科学研究院;
【分类号】：TB559

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