标题：MUD，一种用于沉积物监测的新型声学回声测深仪
Abstract
A new tool to measure both sediment concentration and sediment size is being built by ASL Environmental Sciences Inc. (ASL). The Multifrquency Ultrasonic Device (MUD™) is based on ASL’s successful Acoustic Zooplankton Fish Profiler (AZFP). The MUD/AZFP echosounders can be configured with up to 4 frequencies ranging from 2 MHz to 38 kHz. The MUD prototype is based on a set of higher frequencies (2 MHz, 1.2 MHz, 769 kHz and 200 kHz) that will allow for a balance of particle size discrimination and acoustic range. While the AZFP is a high gain device for low scattering conditions and the greatest possible range, the MUD echosounder is a lower gain system that is being tuned to work in higher backscatter regimes such as the bottom or high concentrations of suspended sediment. ASL’s echosounders are designed for autonomous deployments, with small size and low power draw. They are ideal for long term monitoring studies or for installation on battery-powered autonomous vehicles. Though detuned from their Acoustic Zooplankton and Fish Profiler roots and having shorter ranges, the MUD systems will still record biological
signals, making them a multi-functional tool for environmental impact studies.
摘要：
ASL环境科学（ASL ENVIRONMENT）正在开发一种测量沉积物浓度和沉积物大小的新工具。多频超声波回声探测仪（MUD™）基于ASL成功的声学浮游动物鱼类剖面仪（AZFP）。MUD/AZFP回声探测仪最多可配置4个频率，范围从2 MHz到38 kHz。MUD原型基于一组更高的频率（2 MHz、1.2 MHz、769 kHz和200 kHz），这将实现粒径鉴别和声学范围的平衡。虽然AZFP是一种用于低散射条件和最大可能范围的高增益设备，但MUD回声探测仪是一种低增益系统，正在调整以在更高的反向散射条件下工作，如底部或高浓度悬浮沉积物。ASL的回声测深仪专为自主部署而设计，体积小，功耗低。它们非常适合长期监测研究或安装在电池驱动的自动驾驶汽车上。尽管与声学浮游动物和鱼类剖面仪的根失谐，并且范围较短，但MUD系统仍将记录生物信号，使其成为环境影响研究的多功能工具。
关键词：沉积物声学监测，ASL 回声探测仪，MUD多频超声探测，AZFP 声学浮游动物鱼类剖面仪
