Career Program: New Approaches of Holographic Particle Velocimetry for Studying Turbulence

职业计划：研究湍流的全息粒子测速新方法

• 批准号: 9625307
• 负责人: Hui Meng
• 金额: $ 25.81万
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9625307&HistoricalAwards=false
• 关键词: Career; Program; New; Approaches; Holographic

ABSTRACT CTS-9625307 The research focuses on the development of Holographic Particle Velocimetry (HPV). The understanding of turbulence phenomena is currently hampered by the lack of capability to obtain time-resolved full-field instantaneous three-dimensional (3-D) flow velocity and vortiaity field data. Holographic Particle Velocimetry is highly promising to provide this capability. Current approaches to HPV focus on the solution of one immediate problem (the holographic images vs. speckle noise) and the system configuration are becoming increasingly more complex and user-friendly. The major bottleneck in the HPV technique, is the huge quantity of data processing, that has not been seriously addressed. The proposed HPV approach uses two new ideas: (1) band-pass" In-line Recording Off-axis Viewing" holography, which provides both excellent signal-to-noise performance and geometric and operational simplicity, especially in the pulsed-laser hologram recording process, and (2) hybrid optical-digital processing system, characterized by image compression of the order of 1011 achieved by massively parallel optical correlation, offering a potential for substantial reduction of data processing speed. Besides involving undergraduate students in HPV research, it is planned to introduce optics to Mechanical Engineering curriculum including an instructional optics laboratory and senior design projects. New learning methodologies using interactive multimedia will be developed for a Fluid Mechanics course.

摘要CTS-9625307 本论文主要研究了全息粒子测速技术的发展。 湍流现象的理解目前受到阻碍的能力，以获得时间分辨的全场瞬时三维（3-D）的流场数据。 全息粒子测速法是非常有希望提供这种能力。 目前HPV的方法集中在解决一个直接的问题（全息图像与斑点噪声），系统配置变得越来越复杂和用户友好。 HPV技术的主要瓶颈是大量的数据处理，这一点尚未得到认真解决。 拟议的HPV方法使用了两个新想法：（1）带通”同轴记录离轴观察”全息术，其提供优异的信噪比性能以及几何和操作简单性，特别是在脉冲激光全息图记录过程中，以及（2）混合光学-数字处理系统，其特征在于通过大规模并行光学相关实现1011量级的图像压缩，从而提供了数据处理速度的显著降低的可能性。 除了让本科生参与HPV研究外，还计划将光学引入机械工程课程，包括教学光学实验室和高级设计项目。 将为流体力学课程开发使用交互式多媒体的新学习方法。