Dividing the P- and S- wave components from measured body wave signals is a pivotal yet formidable task for various seismic monitoring devices. In contrast to the commonly employed post processing methods, here, we report a sensor designed to directly extract P-wave signals by filtering out the S-wave component from body waves. The design principle of the sensor capitalizes on the inherent symmetry of a spherical piezoelectric shell and body waves, resulting in the superposition of P-wave excitation charges while concurrently canceling out S-wave excitation charges. The validity of this concept was first confirmed through theoretical analysis and numerical simulations. Laboratory tests further substantiated that the sensor response to P-waves surpasses that to S-waves by two orders of magnitude. The reported sensor sheds sights on the processing of body waves with hardware and validates a new pathway for improving the performance of existing related devices.

中文翻译：

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利用压电球的对称性提取纵波


对于各种地震监测设备来说，从测量的体波信号中分离出纵波和横波分量是一项关键但艰巨的任务。与常用的后处理方法相比，我们在这里报告了一种传感器，旨在通过滤除体波中的 S 波分量来直接提取 P 波信号。该传感器的设计原理利用了球形压电壳和体波的固有对称性，导致P波激励电荷叠加，同时抵消S波激励电荷。这一概念的有效性首先通过理论分析和数值模拟得到证实。实验室测试进一步证实，传感器对 P 波的响应超过对 S​​ 波的响应两个数量级。报道的传感器着眼于用硬件处理体波，并验证了提高现有相关设备性能的新途径。