可变角度换能器在海底沉积物声学原位测量应用的探讨  

Discussion on the Variable-angle Transducer for Acoustic in-situ Measurement in Seafloor Sediments

作　　者：曾洁莹[1] 吴百海[1] 邹大鹏[1] 吴锦虹[1] 

机构地区：[1]广东工业大学机电学院,广东广州510090

出　　处：《海洋技术》2008年第1期32-36,共5页Ocean Technology

基　　金：国家自然科学基金项目(40476020);(40676040)

摘　　要：海底沉积物的声学测量是海底测深的关键技术之一,应用于海底地形地貌测量、海洋矿产资源开采和海底工程建设等。海底沉积物声学测量方法中的原位测量方法可以避免保真采样法的强扰动性和遥测法的准确度、精度及灵敏度的不确定性等缺点,如何改进原位测量系统渐成为海底探测的研究热点。通过分析现有海底沉积物原位测量设备测试换能器的工作原理,针对垂直压入方式换能器测量深度有限,提出了一种通过改变换能器压入沉积物的角度来增加测量深度的方法。在理论上论证出在不低于换能器接收阈值时,测量深度随着掠射角的增加而增加。在不增加压入深度的前提下提供了一种增加测量深度方法。The acoustic measurement of seafloor sediments is one of key techniques in seafloor sounding. It＇s applied to the measurement of seafloor topography and physiognomy, the exploitation of marine mineral resources and the building of submarine engineering. The in-situ measurement method among seafloor sediments acoustic measurement means can avoid the drawbacks which are the strong disturbance in fidelity factor sampling and the uncertainty of accuracy, precision and sensitivity in acoustic telemetry. The measurement system how to be improved becomes gradually study hotspot. This paper analyses the principle of the seafloor sediments in-situ measurements transducer, proposes a fathoming increase method whicb is contraposed the limited fathoming in vertical-press transducer by altering the transducer angle of sediments-press, and theoretically demonstrates that the fathoming would increase while the sweep angle increases, in the premise of the trsducer is not subter-receiving threshold. It would provide an another mether of increasing fathoming besides of press-depth increasing.

关 键 词：原位测量 海底沉积物 换能器 水下载体 声速 

分 类 号：P733.23[天文地球—物理海洋学]