A Multi-Point Array Laser Doppler Velocimeter

多点阵列激光多普勒测速仪

• 批准号: 9361114
• 负责人: Yogesh Agrawal
• 金额: $ 6.5万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-02-01 至 1995-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9361114&HistoricalAwards=false
• 关键词: Multi; Point; Array; Laser; Doppler

9361114 AGRAWAL We are proposing to develop a multi-point laser velocimeter to obtain velocities at a number of points, simultaneously and non- intrusively. Our specific interest is to apply this instrumentation to transport and exchange in surface and bottom boundary layers However, the technique will be applicable to a wide range of flows where simultaneous velocity measurements are desirable. At the heart of the innovation is a completely non- intrusive optical geometry which forms several sample volumes in the flow, and corresponding receiving optics to distinguish their images. Such a device is needed to observe structures in natural flows and to deal with issues such as flow stationarity. This simultaneous view of the velocity field will remove uncertainty in the interpretation of velocity profile information; e.g. the velocity shear and shear stress, turbulent characteristic scales and roughness lengths. The concept also concept also removes the need for mechanical scanning devices or profilers, both of which yield non-simultaneous measurements. The use of this instrument for characterizing the concentration and transport rate of sediments in the bottom boundary layer is described. The concept is also beneficial to laboratory scientists using flumes, towing tanks, and wind tunnels, in that multi-point measurements provide additional information on flow structure and improve productivity.

小行星9361114 我们建议开发一种多点激光测速仪，以获得在多个点的速度，同时和非侵入性。 我们的具体兴趣是将这种仪器应用于表面和底部边界层中的传输和交换。然而，该技术将适用于各种各样的流动，其中需要同时进行速度测量。创新的核心是一个完全非侵入式的光学几何结构，它在流中形成几个样品体积，以及相应的接收光学器件来区分它们的图像。 需要这样的装置来观察自然流动中的结构，并处理诸如流动平稳性之类的问题。 这种速度场的同步视图将消除速度剖面信息解释中的不确定性;例如，速度剪切和剪切应力、湍流特征尺度和粗糙度长度。 该概念还消除了对机械扫描设备或轮廓仪的需要，这两者都产生非同时测量。 使用该仪器的特点的浓度和输运率的沉积物在底部边界层的描述。 这一概念也有利于实验室科学家使用水槽，拖曳坦克，风洞，在多点测量提供更多的信息流结构和提高生产力。