MRI: Development of a Laser-ultrasonic Ice Core Tomography System

1229722Van wijk这项主要研究仪器拨款支持开发一种非接触式、非破坏性的激光声层析成像系统，用于研究冰芯的物理特性，以支持气候动力学和冰川学研究。这项开发将建立在原型仪器设计的基础上，但希望新的仪器组件和方法能够区分冰晶大小和方向、裂缝、气泡密度和颗粒物质密度沿核心分布的细微变化，从而能够快速和自动地识别冰川冰的季节性分层。成功的开发可以使快速确定冰川冰季节性分层的标准方法成为可能，并减少视觉方法和人工薄切片以及冰川冰物理特性光学表征所固有的错误。拟议的发展包括通过弹性波特征测试冰测年方法的稳健性，以及通过气体介质加压在模拟原位压力条件下使用该技术。除了研究冰川之外，该技术还有其他有用的应用（例如，生物医学成像）。开发将在博伊西州立大学物理声学实验室进行，涉及地球物理学研究生和本科生在这个非博士的课堂内外。授予机构。＊＊＊

1229722Van WijkThis Major Research Instrumentation grants support the development of a non-contacting, non-destructive, laser acoustic tomography system for the study of the physical properties of ice cores in support of climate dynamics and glaciological research. The development will build upon a prototype instrument design but it is hoped that the new instrument components and methods will allow for differentiation of subtle changes in the distribution of ice crystal size and orientation, fractures, bubble density and particulate matter density along core to enable rapid and automated identification of seasonal layering of glacial ice. Successful development could enable standard methods for rapid pinpointing of seasonal layering of glacial ice and reduce errors inherent in visual methods and manual thin sectioning and optical characterization of glacial ice physical properties. The proposed development involves testing the robustness of the method for dating ice via its elastic-wave signature and use of the technique in simulated in situ pressure conditions via gas medium pressurization. The technique may have other useful applications beyond studies of glacial ice (e.g., biomedical imaging). Development will take place in the Boise State University Physical Acoustics Lab and involve Geophysics graduate, and undergraduate students in and outside the classroom at this non-Ph.D. Granting institution. ***