MRI: Development of a Micro-Optical Stress Sensor for Fluid Mechanics Research

摘要提案题目：MRI：开发一种用于流体力学的微光学纯应力传感器提案号：cts -0619193-MRI首席研究员：M. Volkan otugen机构：纽约理工大学本研究将为理工大学的多个流体力学研究项目开发一种新型的微光学壁剪切应力传感器。该微光传感器是基于电介质微珠，这些微珠是由来自光纤的耦合光激发的。该技术利用谐振频率的形态相关位移，通常称为窃窃私语廊模式（WGM）。微珠的大小、形状或光学常数的微小变化都会引起谐振频率（或WGM）的变化。这种变化可能与微珠上的应力有关。该传感器将提供直接的、时间分辨的、高灵敏度的、大带宽的墙壁剪切应力测量，在空间上可以很好地分辨。提出的研究将开发一种基于介电谐振器wgm的微光学壁剪应力传感器的新概念，该概念利用了电信领域的最新技术发展。该项目将展示一种微光学壁剪切应力传感器概念，该概念比现有传感器具有更高的分辨率和动态范围，可用于水和气体流动。将在这项工作中使用的光学现象可以用于开发可用于广泛流体动力学应用的新型微传感器；任何可以直接或间接改变尺寸、形状或光学常数（从而引起WGM的移位）的物理刺激都可以以超出现有机械传感器所能实现的分辨率进行检测。此外，这个概念可以很容易地扩展到一个分布式微传感器系统，提供空间数据，也是时间分辨的。虽然目前有人建议应用这种光学现象来开发用于流体力学研究项目的壁面剪切应力传感器，但许多其他应用都是可能的，包括高分辨率温度传感器。随着通过光纤进行宽带通信的发展，微型光学元件wgm的使用在电信行业中迅速普及，其中使用的组件尺寸为几个波长的光。然而，这些部件很少被机械地操纵来开发新的传感器技术。虽然提出的传感器的主要应用领域是流体力学研究，但提出的活动将产生更广泛的影响：微光学壁剪切传感器可以对管道网络建模、制造业过程控制和医疗领域的应用产生重大影响。此外，这项工作的成功完成将为开发更广泛的基于wgm的温度、压力和物种浓度传感器奠定基础。因此，随着这种坚固可靠的光学传感器的发展，长期的回报可能是非常显著的。一个跨学科的研究小组将开展开发活动。开发工作以及研究项目将对理工大学的本科和研究生教育产生直接影响。这些活动将构成研究生（博士）论文和本科生（荣誉课程）论文的基础。此外，通过理工学院的工程与科学青年（YES）计划，来自纽约大都市地区的一些具有不同背景的高中生将在夏季接受培训。此外，一些本科和研究生课程将直接受益于仪器开发活动。

AbstractProposal Title: MRI: Development of a Micro-Optical Sheer Stress Sensor for Fluid Mechanic ResearchProposal Number: CTS-0619193-MRIPrincipal Investigator: M. Volkan OtugenInstitution: Polytechnic University of New YorkIn this research, a novel micro-optical wall shear stress sensor will be developed for a number of fluid mechanics research projects at Polytechnic University. The micro-optical sensor is based on dielectric micro-beads that are excited by coupling light from an optical fiber. The technology exploits the morphology-dependent shifts in resonant frequencies that are commonly referred to as the whispering gallery modes (WGM). A minute change in the size, shape or optical constants of the micro-bead causes a shift in the resonant frequency (or the WGM). This shift can be related to the stress on the micro-bead. The sensor will provide direct, time-resolved, high-sensitivity, large bandwidth measurement of wall shear stress that is well resolved in space. The proposed research will develop a new concept for micro-optical wall shear stress sensors that is based on the WGMs of dielectric resonators which exploits recent technological developments in the telecommunications field. The effort will demonstrate a micro-optical wall shear stress sensor concept that has superior resolution and dynamic range than the currently available sensors and that has applications for both water and gas flows. The optical phenomenon that will be used in this effort can be exploited for the development of a new class of micro-sensors that can be used for a wide range of fluid dynamic applications; any physical stimuli that can directly or indirectly change the size, shape or optical constants (thereby causing a shift in the WGM) can be detected with resolution that are beyond what can be realized by the existing mechanical sensors. Further, the concept can be easily extended to a system of distributed micro-sensors providing spatial data that is also time-resolved. Although it is presently proposed to apply this optical phenomenon to develop wall shear stress sensors for use in fluid mechanics research projects, many other applications are possible including high-resolution temperature sensors. With the growth of wide-band communications through optical fibers, the use of WGMs of miniature optical elements are rapidly becoming commonplace in the telecommunication industry where components that are several wavelengths of light in size are used. However, such components are seldom manipulated mechanically to develop new sensor technologies. Although the primary area of application for the proposed sensor is fluid mechanics research, the proposed activity will have a much broader impact: the micro-optical wall shear sensor can have a significant impact on the modeling of pipeline networks, process control in manufacturing industries, and medical field uses. Further, the successful completion of this effort will lay the groundwork for the development of a much broader range of WGM-based sensors for temperature, pressure and species concentration. Therefore, with the development of rugged, reliable optical sensors of this kind, the long-term payoff are likely to be very significant. An interdisciplinary team of researchers will carry out the development activity. The development effort, along with the research projects, will have a direct impact on undergraduate and graduate education at Polytechnic University. These activities will form the basis of graduate student (PhD) dissertations and undergraduate student (Honors Program) theses. Further, through the Youth in Engineering and Science (YES) program at Polytechnic, a number of high-school students with diverse backgrounds from the New York metropolitan area will be trained during the summer months. Additionally, a number of undergraduate and graduate courses will directly benefit from the instrument development activity.