標題：MUD，一種用于沉積物監測的新型聲學回聲測深儀
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環境科學（ASL ENVIRONMENT）正在開發一種測量沉積物濃度和沉積物大小的新工具。多頻超聲波回聲探測儀（MUD?）基于ASL成功的聲學浮游動物魚類剖面儀（AZFP）。MUD/AZFP回聲探測儀最多可配置4個頻率，范圍從2 MHz到38 kHz。MUD原型基于一組更高的頻率（2 MHz、1.2 MHz、769 kHz和200 kHz），這將實現粒徑鑒別和聲學范圍的平衡。雖然AZFP是一種用于低散射條件和最大可能范圍的高增益設備，但MUD回聲探測儀是一種低增益系統，正在調整以在更高的反向散射條件下工作，如底部或高濃度懸浮沉積物。ASL的回聲測深儀專為自主部署而設計，體積小，功耗低。它們非常適合長期監測研究或安裝在電池驅動的自動駕駛汽車上。盡管與聲學浮游動物和魚類剖面儀的根失諧，并且范圍較短，但MUD系統仍將記錄生物信號，使其成為環境影響研究的多功能工具。
關鍵詞：沉積物聲學監測，ASL 回聲探測儀，MUD多頻超聲探測，AZFP 聲學浮游動物魚類剖面儀
