Tubular phononic crystal sensor platform for (bio)chemical liquid analysis

本项目旨在研究一种新型的声子晶体--管状声子晶体及其作为管状声子晶体传感器的应用。我们的愿景是一种全新的传感器概念，用于在线监测圆柱形结构中的液体，如管道(化学)或容器(医药)。物理上的挑战是声子晶体的表述和物理描述，这些声子晶体是由晶格几何从具有平移对称的2D平面或3D笛卡尔到具有平移和旋转对称的3D柱面的根本改变而产生的。工程上的挑战是从在界面测量的化学传感器到分析物，再到决定分析物体积性质的新的传感器类别的最终变化。这一新概念将充分考虑液体中的声场和固体中的弹性场的基本相互作用。声波将被量身定做，使其扰乱管道或容器中液体的小体积，从而揭示其物理性质。该项目将提供一个平台，用于确定体积性质背后的未发现信息，这是由于从根本上获得液体和混合物的潜在化学或生物医学现象的途径。这些目标将通过四个研究方向实现：1.管状声子晶体的开发，这是一类周期性结构的弹性圆柱体，用于沿旋转轴传播波。TPC将构成一个全新的设备家族，其几何形状到目前为止还没有在文献中考虑过2。研究在小的共振液相区定位声能的先进人工结构。这一部分包括宏观和微观尺度上的声场和弹性场之间的相互作用。管钟作为一种新型声学传感器的发展。将深入分析声子谐振器，考虑分析物的属性，即声速和质量密度以及粘度和其他耗散值，转化为TPC的声学属性，即所选模式的共振频率和带宽4。实现TPC和管状贝尔样机作为理论研究的实验验证和新传感器概念的演示目标频率分辨率为10-5f0，争取声速分辨率&lt；0.05m/S。该项目需要固体物理、材料科学、微制造和测量科学之间的交叉学科合作。该项目的重要里程碑是：(I)展示充液管状结构中的声子带隙(Ii)必须探索和优化管状结构中声波的激发、传播和检测以及与共振模式的耦合(Iii)必须建立声值与液体混合物的材料性质和组成之间的关系，以将物理结果转化为可测量的传感器效应

The project aims at a new class of phononic crystals, Tubular Phononic Crystals (TPCs) and their application as Tubular Phononic Crystal Sensor, the Tubular Bell. Our vision is a fundamentally new sensor concept for in-line monitoring of liquids in cylindrical structures like pipes (chemistry) or vessels (medicine). The physical challenge is formulation and physical description of phononic crystals created by a radical change of lattice geometry from 2D planar or 3D Cartesian with translational symmetry to 3D cylindrical with both translational and rotational symmetries. The engineering challenge is the ultimate change from chemical sensors measuring at the interface to an analyte to a new sensor class determining volumetric properties of an analyte. This novel concept will be fully explored considering fundamental interactions of acoustic fields in liquids and elastic fields in solids. Acoustic waves will be tailored so that they perturb sub-volumes of liquids in pipes or vessels revealing their physical properties. The project will deliver a platform for determination of undiscovered information behind volumetric properties due to a fundamentally new access to underlying chemical or biomedical phenomena of liquids and mixtures.These objectives will be accomplished by means of four research lines:1. Development of Tubular Phononic Crystals, a class of periodically structured elastic cylinders for wave propagation along the revolution axis. TPCs will constitute a completely new family of devices with geometries not considered so far in literature2. Investigation of advanced artificial structures to localize acoustic energy in small resonant liquid regions. This part includes the interaction between the acoustic and elastic fields at both macroscopic and microscopic scales3. Evolution of the Tubular Bell as new class of acoustic sensor. The phononic resonators will be deeply analyzed, considering the transduction of properties of an analyte, namely sound velocities and mass density as well as viscosity and other dissipation values, into acoustic properties of the TPC, namely resonance frequency and bandwidth of selected modes4. Realization of TPC and Tubular Bell prototypes for experimental proof of theoretical investigations and as demonstrator of the new sensor conceptThe target frequency resolution is 10-5 f0, striving for a sound velocity resolution <0.05 m/s. The project requires interdisciplinary work between solid state physics, material science, microfabrication, and measurement science. Significant milestones for the project are:(i) Demonstration of phononic band gaps in liquid-filled tubular structures(ii) Acoustic wave excitation, propagation, and detection in tubular structures and the coupling to resonant modes must be explored and optimized(iii) The relation between acoustic values and material properties and composition of liquid mixtures must be established to transfer the physical results into a measurable sensor effect