Weak signals detection plays an important role in industrial production. We propose the space-coiling gradient acoustic grating to control the sound wave transmission and realize the acoustic enhancement. The numerical results show that the acoustic pressure amplitude can be amplified more than 240 times, and the corresponding frequency can be reduced to 500Hz. Besides, we optimize properties of the space-coiling acoustic grating and apply it into the field of weak signals detection. For periodic impulse signals, the amplitude of characteristic frequency is effectively enlarged, which make the detection of the characteristic frequency is much easier.

中文翻译：

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基于空间螺旋梯度声光栅的声学增强与弱信号检测

弱信号检测在工业生产中发挥着重要作用。我们提出了空间盘绕梯度声光栅来控制声波传输并实现声学增强。数值结果表明，声压幅值可放大240倍以上，相应频率可降至500Hz。此外，我们优化了空间盘绕声光栅的特性并将其应用于弱信号检测领域。对于周期脉冲信号，有效地放大了特征频率的幅值，使得特征频率的检测更加容易。