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Doubly Negative Acoustic Metamaterials with Air-Coupled Diaphragms

具有空气耦合隔膜的双负声学超材料

基本信息

批准号：
1663135
负责人：
Haijun Liu
金额：
$ 31.36万
依托单位：
Temple University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-07-01 至 2021-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1663135&HistoricalAwards=false
关键词：
Doubly Negative Acoustic Metamaterials Air

项目摘要

In recent years, Acoustic Metamaterials (AMM) have become an emerging tool to create materials with exotic properties that are not found in natural materials. A central idea in this research project is the realization of doubly negative mass density and bulk modulus (a.k.a. negative index material), which is the key to designing many AMM devices with novel functionalities. Such material's refractive index for an electromagnetic wave has a negative value over some frequency range. This research supports fundamental advances on the creation of a new type of AMM with double negativity, whose unit cell consists of diaphragms directly coupled by an air cavity. With this simple yet innovative configuration, the unit cell can be easily scaled to form 1D, 2D, and 3D AMM, paving the ways for transforming many applications ranging from super-resolution imaging, cloaking, to perfect absorbers. The outcome from the this research will be integrated into new course that will serve as a catalyst to motivate students, particularly minority and women, to pursue advanced degrees and careers in science and engineering.This research project supports fundamental research on a new type of AMM with double negativity. The research will investigate characteristics of such materials using a comprehensive approach including analytical, numerical, and experimental methods. The overall objective of the awarded research program is to achieve a fundamental understanding of the AMM with air-coupled diaphragms, develop fiber optic sensors for in situ pressure and displacement measurements, and use the gained understanding and the developed new tools to create AMM with double negativity. With a simple configuration of air-coupled diaphragms, the unit cells can be scaled to form 1D, 2D, and 3D AMM that has the potential to transform many applications requiring double negativity (e.g. sub-wavelength imaging and transformation acoustics) and complex geometry (e.g. acoustic metasurface). Newly developed fiber optic sensors will be used for mapping the pressure and displacement fields inside and outside the AMM. The work also complements theoretical and numerical studies with the well-thought out experiments that use high-performance fiber optic probes to map the acoustic wave. This work provides a new paradigm to the study of wave manipulation by AMM and has wide spread applications in fields such as imaging, cloaking, and several others.

近年来，声学超材料（AMM）已成为一种新兴的工具，以创造具有奇异性质的材料，在自然材料中找不到。该研究项目的中心思想是实现双负质量密度和体积模量（a.k.a.）。负折射率材料），这是设计许多具有新功能的AMM器件的关键。这种材料对电磁波的折射率在某些频率范围内具有负值。这项研究支持了创造一种新型双负性AMM的根本性进展，其单元由通过空气腔直接耦合的隔膜组成。通过这种简单而创新的配置，单位单元可以轻松缩放以形成1D，2D和3D AMM，为从超分辨率成像，隐身到完美吸收器的许多应用的转变铺平了道路。这项研究的结果将被整合到新的课程中，作为一种催化剂，激励学生，特别是少数民族和妇女，追求科学和工程领域的高级学位和职业生涯。这项研究项目支持对一种新型的双重消极的AMM的基础研究。该研究将使用包括分析，数值和实验方法在内的综合方法来研究此类材料的特性。获奖研究项目的总体目标是对空气耦合膜片AMM有一个基本的了解，开发用于现场压力和位移测量的光纤传感器，并利用所获得的理解和开发的新工具来创建具有双重负性的AMM。通过空气耦合膜片的简单配置，单位单元可以缩放以形成1D、2D和3D AMM，其具有改变需要双负性（例如，亚波长成像和变换声学）和复杂几何形状（例如，声学超表面）的许多应用的潜力。新开发的光纤传感器将用于绘制AMM内外的压力和位移场。这项工作还补充了理论和数值研究与深思熟虑的实验，使用高性能光纤探头映射声波。这项工作为AMM波操纵的研究提供了一个新的范例，并在成像，隐身等领域具有广泛的应用。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Acoustic Metamaterial With Air-Backed Diaphragm for Broadband Absorption: A Preliminary Study

用于宽带吸收的带气垫隔膜的声学超材料：初步研究

DOI：
10.1115/imece2020-23928
发表时间：
2021
期刊：
Proceedings of the ASME 2020 International Mechanical Engineering Congress and Exposition (IMECE
影响因子：
0
作者：
Dong, Qian;Song, Xiaolei;Ray, Subhrodeep;Liu, Haijun
通讯作者：
Liu, Haijun

Effects of Air Cavity in Dynamic Pressure Sensors: Experimental Validation

动态压力传感器中气腔的影响：实验验证