Foundational Experiments for Planar Optical Velocimetry in Single and Multiphase Flows

单相流和多相流中平面光测速的基础实验

• 批准号: 9632739
• 负责人: Brian Thompson
• 金额: $ 5万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632739&HistoricalAwards=false
• 关键词: Foundational; Experiments; Planar; Optical; Velocimetry

ABSTRACT CTS-9632739 A new approach for the detection of the Doppler wavelength shift and a corresponding new instrument (Doppler Fluorescence Velocimetry, DFM) for single and two-phase flow velocity measurements will be investigated. The Doppler shift is transformed into wave intensity ratio by collecting the laser beams into a fluorescence chamber. The signal is projected on a black background, from where a fast-color-switcher with an acoustic-optic-tunnel filter is used to measure the intensity ratio. Two systems, a point velocimeter with a photomultiplier tube and a planar velocimeter with a CCD array, will be simultaneously constructed and tested. It is expected that the sensitivity and the signal-to-noise ratio will increase significantly. If successful, the system will allow for higher frequency response and simpler operation with out system alignment. The objective of the project is to prove the feasibility of the concept, and to find the most suitable areas of application. The proposed concept may lead to significant increase in versality and efficiency of velocity measurements in some conditions as compared to the laser Doppler velocimetry (LDV), Phase-Doppler anemometry (PDA), and particle image velocimetry (PIV). ***

摘要CTS-9632739 一种新的方法，用于检测的多普勒波长偏移和相应的新仪器（多普勒荧光测速仪，DFM）的单相和两相流速度测量将进行研究。 通过将激光束收集到荧光室中，将多普勒频移转换为波强度比。 信号投射在黑色背景上，从那里使用具有声光隧道滤波器的快速颜色切换器来测量强度比。 两个系统，一个点速度与光电倍增管和一个平面速度与CCD阵列，将同时构建和测试。 预期灵敏度和信噪比将显著增加。 如果成功，该系统将允许更高的频率响应和更简单的操作，而无需系统校准。 该项目的目的是证明这一概念的可行性，并找到最适合的应用领域。 与激光多普勒测速（LDV）、相位多普勒测速（PDA）和粒子图像测速（PIV）相比，该方法在某些条件下可显著提高速度测量的多样性和效率。 ***