High-speed two-color scanning volumetric laser-induced fluorescence

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Diego Tapia Silva, Cole J. Cooper, Tracy L. Mandel, Shilpa Khatri, Dustin Kleckner
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引用次数: 0

Abstract

Many problems in fluid mechanics require single-shot 3D measurements of fluid flows, but are limited by available techniques. Here, we design and build a novel flexible high-speed two-color scanning volumetric laser-induced fluorescence (H2C-SVLIF) technique. The technique is readily adaptable to a range of temporal and spatial resolutions, rendering it easily applicable to a wide spectrum of experiments. The core equipment consists of a single monochrome high-speed camera and a pair of ND: YAG lasers pulsing at different wavelengths. The use of a single camera for direct 3D imaging eliminates the need for complex volume reconstruction algorithms and easily allows for the correction of distortion defects. Motivated by the large data loads that result from high-speed imaging techniques, we develop a custom, open-source, software package, which allows for real time playback with correction of perspective defects while simultaneously overlaying arbitrary 3D data. The technique is capable of simultaneous measurement of 3D velocity fields and a secondary tracer in the flow. To showcase the flexibility and adaptability of our technique, we present a set of experiments: (1) the flow past a sphere, and (2) vortices embedded in laminar pipe flow. In the first experiment, two channel measurements are taken at a resolution of 512 × 512 × 512 with volume rates of 65.1 Hz. In the second experiment, a single-color SVLIF system is integrated on a moving stage, providing imaging at 1280 × 304 × 256 with volume rates of 34.8 Hz. Although this second experiment is only single channel, it uses identical software and much of the same hardware to demonstrate the extraction of multiple information channels from single channel volumetric images.

Abstract Image

高速双色扫描体积激光诱导荧光技术
流体力学中的许多问题都需要对流体流动进行单次三维测量,但却受到现有技术的限制。在这里,我们设计并构建了一种新型灵活的高速双色扫描体积激光诱导荧光(H2C-SVLIF)技术。该技术可随时适应各种时间和空间分辨率,因此很容易应用于各种实验。核心设备包括一台单色高速相机和一对不同波长的 ND: YAG 脉冲激光器。使用单台照相机直接进行三维成像,无需复杂的体积重建算法,并可轻松校正畸变缺陷。受高速成像技术产生的大量数据负载的影响,我们开发了一个定制的开源软件包,可以在实时回放和修正透视缺陷的同时叠加任意三维数据。该技术能够同时测量三维速度场和流动中的二次示踪。为了展示我们技术的灵活性和适应性,我们介绍了一组实验:(1) 流过一个球体,以及 (2) 嵌入层流管道中的涡流。在第一个实验中,我们以 512 × 512 × 512 的分辨率和 65.1 Hz 的流速进行了双通道测量。在第二个实验中,在移动台上集成了单色 SVLIF 系统,以 1280 × 304 × 256 的分辨率和 34.8 Hz 的体积率进行成像。虽然第二个实验只有单通道,但它使用了相同的软件和大部分相同的硬件,演示了从单通道容积图像中提取多个信息通道的过程。
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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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