多通道数据采集与处理系统在深水网箱鱼群监测中的应用

Application of Multi-channel Sampling and Processing System in Fish Cage Monitoring

深水网箱中的鱼群安全是深水网箱养殖发展中的一个重要问题.提出了一种采用多波束水声换能器(8波束)分区扫描深水网箱对网箱中鱼群分布状态进行实时监测的新方法,设计了一个基于先入先出技术(FIFO)和虚拟仪器技术(LabVIEW)的多通道数据采集、传输和处理系统,实现了深水网箱鱼群实时监测系统中8个通道回波信号的并行采集和实时处理、深水网箱海上养殖现场与陆地岸站之间的无线数据传输及终端显示等功能.海上现场试验结果表明:系统性能稳定,多通道数据采集与处理系统实时性强、操作使用方便,通过无线数据传输在岸站能实时监测到深水网箱内的鱼群分布和网衣状态,在推广深水网箱养殖安全配套设施上具有广泛的应用前景.

Fish security is always an important issue that should be considered throughout the development of offshore aquaculture fish cages. In order to monitor fish activity and distribution in offshore aquaculture fish cage, this paper introduced a novel cage monitoring system which brought forward a new multi-beam （8 beam） divisional acoustic scanning mode to replace of the existing singlebeam mechanical scanning mode. Based on the new scanning mode and the techniques of first in first out memory （FIFO） and virtual instrument （LabVIEW software）, this system finished 8-channel echo signal processing and sampling, wireless data transmission, real time digital signal processing and image displaying. Comparing with the existing system of mechanical scanning mode, it has a more simplified architecture,an easier power supply and a higher scanning speed. The tests were carried out in the lab and the field of Quanzhou Weitou harbor. Results show that the system has good performance in monitoring the fish activity,distribution and the status of the net cages under different environment condition.