SBIR Phase II: A Multi-Point Array Laser Doppler Velocimeter

SBIR 第二阶段：多点阵列激光多普勒测速仪

• 批准号: 9502488
• 负责人: John Smith
• 金额: $ 29.99万
• 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: 1995
• 资助国家: 美国
• 起止时间: 1995-10-01 至 1997-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9502488&HistoricalAwards=false
• 关键词: SBIR; Phase; II; Multi; Point

AGRAWAL 9502488 This Small Business Innovation Research Phase-II project is directed at the completion of a research/commercial prototype multi-point laser velocimeter for use in laboratories and also for use unattended in the ocean. Measurements of velocity at a single point are seldom sufficient in nature; when only single-point velocimeters are available, profiling is employed to obtain information regarding structures of a flow-field. Profile information has invariably been derived by mechanical traversing of a sensor 'head'. Not only is synopticity sacrificed in this manner, causing loss of order in structure data, but also all information on spatial structures, coherent motions, and space-time scales is lost. Driven by needs in his research, the P.I. has devised a multi-point velocimetry system which forms several sample volumes in the flow field simultaneously. Signals from these sample volumes are separately carried to photo-detectors. A multi-signal processor is then required to convert the signal to simultaneous- multi-point velocity data, retaining information on order inherent in the flow, and all information for deriving space-time scales of fluid structures. In Phase-I, we have successfully demonstrated the principle of the method by constructing a single-velocity- component multi-point velocimeter, as first explained in the Phase- I proposal. In Phase-II, we shall expand capabilities to a 2-axis multi-point velocimeter, with direction discrimination optics and a complete multi-signal processor. The instrument will be tested in the laboratory and the field.

AGRAWAL 9502488 这个小型企业创新研究第二阶段项目旨在完成研究/商业原型多点激光测速仪，用于实验室以及在无人值守的海洋中使用。在自然界中，单点速度的测量很少是足够的。当只有单点测速仪可用时，可采用分析来获取有关流场结构的信息。轮廓信息总是通过传感器“头”的机械移动来获得。 以这种方式不仅牺牲了概要性，导致结构数据的顺序丢失，而且所有关于空间结构、相干运动和时空尺度的信息都丢失了。在研究需求的推动下，P.I.设计了一种多点测速系统，可在流场中同时形成多个样本体积。来自这些样本量的信号被分别传送至光电探测器。 然后需要多信号处理器将信号转换为同时多点速度数据，保留流动中固有的顺序信息以及用于导出流体结构的时空尺度的所有信息。 在第一阶段，我们通过构建单速度分量多点测速仪成功地演示了该方法的原理，正如第一阶段提案中首先解释的那样。 在第二阶段，我们将把功能扩展到 2 轴多点测速仪，配备方向辨别光学器件和完整的多信号处理器。该仪器将在实验室和现场进行测试。