海底管道检测中侧扫声纳声波掠射角的优化设计

Optimization of Grazing Angles in Submarine Pipeline Inspection Using Side-scan Sonar

针对利用侧扫声纳检测海底管道时因其检测声影图像模糊而导致管道悬空高度检测误差过大的问题,提出了侧扫声纳声波掠射角优化设计的思路及方法。阐述了利用侧扫声纳对海底管道进行检测的工作原理,并利用海底管道和海底底质反向散射强度的计算公式探讨了声波在海底的反向散射强度、侧扫声纳声影图像的质量以及声波掠射角的取值这三者之间的关系对海底管道悬空高度h计算精度的影响,从理论上确定声波掠射角最佳取值范围的存在。通过工程实例的现场检测与比对试验,获得了在本试验所处海域环境中利用侧扫声纳检测海底管道时声波掠射角的最佳取值范围,对于类似的海底管道检测工程具有一定的指导意义。

In order to solve the problem that the acoustic image is fuzzy and the error of suspended height is too big in submarine pipeline inspection using side-scan sonar,the idea and the method of the grazing angle optimization of side-scan sonar are proposed.This article describes the principle of using the side scan sonar to detect the submarine pipeline, and discusses the influence of the relationship among the reverberant scattering intensity of acoustic waves on the seafloor, the quality of the acoustic image inspected and the grazing angle value of the side- scan sonar to the calculation accuracy height of the submarine pipeline.The optimal range of the grazing angle is verified theoretically.By the field inspection and comparison experiment of an engineering example in which the submarine pipeline is inspected by the side-scan sonar, the optimal range of the grazing angle is obtained.The optimization method will be the guidance for the similar project of submarine pipeline inspection.