Jiang Tianxi, Li Chong, He Qingbo, Peng Zhi-Ke
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, 200240, Shanghai, People's Republic of China.
Nat Commun. 2020 May 11;11(1):2353. doi: 10.1038/s41467-020-15950-1.
Vibrations carry a wealth of useful physical information in various fields. Identifying the multi-source vibration information generally requires a large number of sensors and complex hardware. Compressive sensing has been shown to be able to bypass the traditional sensing requirements by encoding spatial physical fields, but how to encode vibration information remains unexplored. Here we propose a randomized resonant metamaterial with randomly coupled local resonators for single-sensor compressed identification of elastic vibrations. The disordered effective masses of local resonators lead to highly uncorrelated vibration transmissions, and the spatial vibration information can thus be physically encoded. We demonstrate that the spatial vibration information can be reconstructed via a compressive sensing framework, and this metamaterial can be reconfigured while maintaining desirable performance. This randomized resonant metamaterial presents a new perspective for single-sensor vibration sensing via vibration transmission encoding, and potentially offers an approach to simpler sensing devices for many other physical information.
振动在各个领域承载着丰富的有用物理信息。识别多源振动信息通常需要大量传感器和复杂硬件。压缩感知已被证明能够通过对空间物理场进行编码来绕过传统传感要求，但如何对振动信息进行编码仍未得到探索。在此，我们提出一种具有随机耦合局部谐振器的随机共振超材料，用于单传感器对弹性振动的压缩识别。局部谐振器无序的有效质量导致高度不相关的振动传输，从而可以对空间振动信息进行物理编码。我们证明，空间振动信息可以通过压缩感知框架进行重建，并且这种超材料在保持理想性能的同时可以重新配置。这种随机共振超材料为通过振动传输编码进行单传感器振动传感提供了新视角，并有可能为许多其他物理信息提供更简单传感设备的方法。
