EAGER: A Novel Hybrid Light-Field and High-Energy Pulse Color and Depth Encoded Illumination PIV Technique for Unsteady Flow Analyses

EAGER：一种用于非稳态流分析的新型混合光场和高能脉冲颜色和深度编码照明 PIV 技术

• 批准号: 2418485
• 负责人: Rodward Hewlin
• 金额: $ 28.33万
• 依托单位: University of North Carolina at Charlotte
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2418485&HistoricalAwards=false
• 关键词: EAGER; Novel; Hybrid; Light; Field

Time dependent fluid flow such as aerodynamic and physiological flow are often studied experimentally using particle image velocimetry (PIV). This has been the gold standard for over three decades and has been an effective technique to acquire two-dimensional flow information. Tomographic PIV emerged as a flow measurement technique to obtain three-dimensional (3D) flow information in complex fluid flow scenarios. However, this method is costly as it requires a multiple camera setup (typically 4 to 6 expensive cameras), a complex flow image reconstruction technique and the results are typically limited to the camera alignment which often results in poor axial resolution. Recent work has shown that it is possible to obtain 3D PIV measurements using a single light field camera setup. However, the axial resolution remains limited. As a result, this research project aims to address these limitations by developing and validating a novel 3D PIV technique that incorporates a single light field color camera, a high energy pulsed rainbow illumination beam for generating color coded and particle depth information, and an in-house developed particle and flow reconstruction algorithm. This method will improve limitations in axial resolution and will significantly advance capabilities of fluid flow measurement systems in academia, industry, and national laboratories. The particle and flow algorithms and validations will be disseminated to a wide range of potential users. The educational component of this research will translate engineering analysis research to the classroom and enhance engineering recruitment and retention by targeting students from community colleges and university undergraduate students.This research project aims to develop a novel technique for 3D PIV that incorporates a single light-field camera, a high-energy pulse color-depth encoded beam, an alternating direction of multipliers (ADMM) and modified Horn-Schunck optical flow algorithm for particle position and flow reconstruction. Fundamentally, the light field camera will capture two-dimensional (2D) angular, spatial, and color-depth encoded information of particles illuminated by the high-energy beam, providing higher resolution particle reconstruction compared to current 3D PIV approaches. This research effort will address issues related to system development, system calibration, validation of measurements, and examining the technique’s ability to achieve 3D flow measurements in complex flow experiments with improved axial resolution. If successful, this novel technique will provide high 3D axial resolution measurement capabilities to researchers and engineers in all areas ranging from aeronautics to biomedical, thus having an indirect yet very broad impact on the nation’s industrial and research infrastructure.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

空气动力学和生理流动等时间依赖性流体流动通常使用粒子图像测速 (PIV) 进行实验研究，这已成为三十多年来的黄金标准，并且已成为获取二维流动信息的有效技术。一种在复杂流体流动场景中获取三维 (3D) 流动信息的流量测量技术，但这种方法成本高昂，因为它需要多个摄像机设置（通常是 4 到 6 个昂贵的摄像机）、复杂的流量图像重建技术和结果通常是有限的最近的工作表明，使用单个光场相机设置可以获得 3D PIV 测量，但轴向分辨率仍然有限。通过验证一种新颖的 3D PIV 技术来解决这些限制，该技术结合了单光场彩色相机、用于生成颜色编码和粒子深度信息的高能脉冲彩虹照明光束，以及内部开发的粒子和开发流重建算法。将改善限制轴向分辨率，并将显着提高学术界、工业界和国家实验室的流体流量测量系统的能力。颗粒和流量算法和验证将传播给广泛的潜在用户，该研究的教育部分将转化为工程分析。该研究项目旨在开发一种 3D PIV 新技术，该技术结合了单光场相机、高能脉冲色深编码光束，乘法器交替方向 (ADMM) 和改进的 Horn-Schunck 光流算法用于粒子位置和流重建 从根本上来说，光场相机将捕获由粒子照射的二维 (2D) 角度、空间和颜色深度编码信息。与当前的 3D PIV 方法相比，高能束可提供更高分辨率的粒子重建。这项研究工作将解决与系统开发、系统校准、测量验证以及检查该技术实现 3D 流的能力相关的问题。如果成功的话，这项新技术将为从航空到生物医学的所有领域的研究人员和工程师提供高 3D 轴向分辨率测量能力，从而对国家的工业和工业产生间接但非常广泛的影响。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。