We propose a novel approach to design a tunable acoustic channel drop filter based on a fluid–fluid phononic crystal (PnC), using two ring resonators. A square lattice of infinitely long cylindrical water inclusions is embedded in the mercury matrix to characterize the PnC structure. We show that the output resonant frequency can be ultra-tuned by changing the location of each ring, and the quality factor can be enhanced. This property is also used to select the output port, either selecting a forward or backward dropping port. Numerical results show that the quality factor $\left(Q\right)$ of the structure is $Q=2000$ in which its center frequency is $69.990\mathrm{KHz}$. Moreover, the effect of different temperatures ($10°\mathrm{C}$to $40°\mathrm{C}$) and pressures ($0.1\mathrm{MPa}$ to $5\mathrm{MPa}$) on the performance of the channel drop filter is explored. The observations of this work can be useful for the design of an acoustic temperature/pressure sensor. Furthermore, we investigate the effect of aqueous binary mixtures of Na₃PO₄ in water, and show that our proposed structure is useful for determining the compositions of liquid mixtures by changing the effective path length of the acoustic wave.

我们提出了一种新颖的方法，该方法使用两个环形谐振器来设计基于流体-声子晶体（PnC）的可调声通道降滤器。无限长的圆柱形水夹杂物的方格嵌入汞基质中，以表征PnC结构。我们表明，通过改变每个环的位置可以超调输出谐振频率，并且可以提高品质因数。此属性还用于选择前向或后向丢弃端口选择输出端口。数值结果表明品质因数$（问）$ 结构的是 $问=2000$ 其中心频率为 $69。990\mathrm{千赫}$。此外，不同温度的影响（$10°\mathrm{C}$至 $40°\mathrm{C}$）和压力（$0。\mathrm{1个}\mathrm{兆帕}$ 至 $5\mathrm{兆帕}$），探讨了通道下降滤波器的性能。这项工作的观察结果对于设计声音温度/压力传感器很有用。此外，我们研究了Na ₃ PO ₄水溶液在水中的二元混合物的影响，并表明我们提出的结构可用于通过更改声波的有效路径长度来确定液体混合物的成分。