海底底质声学参数测量系统设计

A Design on an equipment for measuring acoustic properties of sea-floor sediment

海底底质声学参数测量系统用于测量海底沉积物的声速和声衰减参数,它由水上主控子系统和水下测量子系统构成。水上主控子系统由工控机、数据传输接口和GPS定位模块组成,实现实时控制、数据处理与记录功能;水下测量子系统由声系、数据采集和传输模块组成,完成水下声波信号数字化及数据上传。水上设备与水下装置间通过电缆建立低速的下行命令信道和高速的上行数据信道,数据通讯采用曼彻斯特编码调制方式。水上计算机通过下传命令实时改变数据采集模块的控制参数,能够在各种环境条件下获得最佳测量效果。实验证明,仪器测量达到预期效果。

A design on an equipment for measuring acoustic attenuation and compressional velocity in seafloor sediments is described. It is composed of on-water equipment and under-water measuring module. The on-water equipment, including a computer, a global positioning module and a data communication module, is used for the real-time remote control of under-water data acquisition, data receiving, processing, and recoding. The under-water measuring module includs sonic sondes, data acquisition module, and data communication module, fulfills data acquisition and transmission. With a communication cable between them, a duplex channel with Manchester code modulation is formed. Under-water module can transmit data up with high speed, and the On-water computer can transmit commands down to adjust control parameters for data acquisition to get the best results in various conditions. It is certified that the design is feasible by experiment.