Upgrade of a Two Axis, Foward-Scatter, Laser-Doppler Velocimeter used in Flume Studies of Oceanographic Processes

伍兹霍尔海洋学海岸研究实验室 机构将升级老化的双轴前向散射激光器 多普勒体积计（LDV）。 LDV安装在一个17米的大型 循环海水水槽，用于大量的 为各种项目的调查员。 一些电子和 系统的电光元件已经劣化， 由于盐气溶胶的持续存在， 变得过时了。 水槽提供了一个稳定的流动再循环 在水槽中设置海水和实验， 细尺度流动特性和湍流脉动， 与实验有关。LDV测量多普勒频率 从两个激光束中转移到流动中。 先进 信号处理被用于导出 流动的海水 使用水槽和LDV更好地在- 静止流特性变得越来越重要 用于研究海洋学过程，特别是在海底 边界层 这一升级将以具有成本效益的方式提供 将可供共享使用的最先进的系统。

The Coastal Research Laboratory at the Woods Hole Oceanographic Institution will upgrade an aging two-axis, forward-scatter laser Doppler volicimeter (LDV). The LDV is mounted on a large 17-meter recirculating seawater flume that is used by a large number of investigators for a variety of projects. Several electronic and electro-optical components of the system have deteriorated over time due to the continual presence of salt aerosols and others have become obsolete. The flume provides a steady flow of recirculating seawater and experiments are set up in the flume to measure the fine-scale flow characteristics and turbulence fluctuations assoc- iated with the experiment. The LDV measures the Doppler frequency shift from two laser beams that are aimed into the flow. Advanced signal processing is used to derive detailed patterns of the flowing seawater. The use of flumes and LDVs for better under- standing flow characteristics is becoming increasingly important for studying oceanographic processes, especially within the bottom boundary layer. This upgrade will cost-effectively provide a state-of-the-art system that will be available for shared use.