声学超材料和亥姆霍兹共振结构的自供能传感器
A Self-powered Sensor of Acoustic Metamaterial and Helmholtz Resonator Structure
马珂婧 1陈虎越 2张文明1
作者信息
- 1. 上海交通大学 机械与动力工程学院,上海 200240
- 2. 上海交通大学 密西根联合学院,上海 200240
- 折叠
摘要
随着物联网的发展,自供能声学传感器得到了广泛关注.然而,压电传感器的灵敏度等关键指标难以进一步提升.声学超材料能以传统材料无法实现的方式操控声波,为新型声学传感器的设计提供了新思路.本文设计了一种声学超材料和亥姆霍兹谐振结构的自供能声学传感器,并验证了具有缺陷的声学超材料能够聚焦声能;此外,亥姆霍兹谐振器能将聚焦在声学超材料缺陷处的能量进一步放大,传输比超过40 mV/Pa,能满足小型传感器的自供能需求.实验结果表明:与仅有局部缺陷的声学超材料传感器相比,基于亥姆霍兹谐振器的声学超材料传感器具有更高的灵敏度和信噪比.
Abstract
With the development of Internet of Things,self-powered acoustic sensors have attracted extensive attention.However,it is difficult to further improve piezoelectric sensors'sensitivity and other vital indicators.Acoustic metamaterials can manipulate sound waves,while traditional materials cannot,thus providing a new method for designing new acoustic sensors.This paper designs a self-powered sensor of acoustic metamaterial and Helmholtz resonance structure.It also verifies that the defective acoustic metamaterial can focus acoustic energy.In addition,the Helmholtz resonator can further amplify the acoustic energy focused on the defective acoustic metamaterial.Its transmission ratio is more than 40 mV/Pa and meets the demand of a small self-powered sensor.The experimental results show that compared with the acoustic metamaterial sensor,the acoustic metamaterial sensor based on the Helmholtz resonator has higher sensitivity and signal-to-noise ratio.
关键词
声学超材料/亥姆霍兹谐振器/声学传感器Key words
acoustic metamaterials/Helmholtz resonator/acoustic sensor引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据