The Spatial Response of Acoustic Travel-Time Current Meters in the Measurement of Turbulence

声学走时海流计在湍流测量中的空间响应

• 批准号: 9711397
• 负责人: Eugene Terray
• 金额: $ 8.74万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711397&HistoricalAwards=false
• 关键词: Spatial; Response; Acoustic; Travel; Time

This technology development project deals with acoustic travel- time current meters (ACMs) that are widely used in oceanography and the atmospheric sciences to measure boundary layer turbulence. These sensors infer velocity by measuring the difference in time required for acoustic pulses to travel both ways between opposing transducers separated by a distance L. The response of such a device to turbulence having spatial scales equal to or smaller than L should be attenuated, and a simple model of the ACM response function based on this idea has been known for almost 30 years. However, recent field and laboratory measurements of the spatial response of ultrasonic ACMs to turbulence in water show that measured velocities are less attenuated than this simple model predicts. Research will be conducted to test whether anomalous behavior of ACMs is due either to flow distortion or to spatial variations in the amplitude and phase of the acoustic field, and to distinguish between these alternatives. It is expected that an improved understanding of the spatial response of ACMs will considerably enhance their usefulness as turbulence sensors in the ocean, and should lead to improved sensor design and performance.

本技术开发项目涉及广泛用于海洋学的声学走时海流计（ACM） 和大气科学来测量边界层 急流. 这些传感器通过测量 声脉冲传播到两个方向所需的时间差 在相对的换能器之间隔开距离L的通道。 的 这种装置对具有空间尺度的湍流的响应 等于或小于L的值应衰减， 基于这一思想的ACM响应函数模型已被 近30年来， 然而，最近的现场和实验室 测量超声波ACM的空间响应， 水中的湍流表明， 比这个简单模型预测的要弱。研究将 测试ACM的异常行为是否是由于 或者是流动变形，或者是空间变化， 声场的振幅和相位，并区分 在这些选择之间。预计，改善 了解ACM的空间响应将大大 增强其作为海洋湍流传感器的实用性， 应该导致改进的传感器设计和性能。