基于声传感阵列的地面标记信号增强方法（英文）  

An Enhanced Above Ground Marking Method Based on Acoustic Sensor Array

作　　者：李一博[1] 周纯瑶 刘双赛 祝慧宇 孙立瑛[2] 

机构地区：[1]精密测试技术及仪器国家重点实验室(天津大学),天津300072 [2]天津城建大学控制与机械工程学院,天津300384

出　　处：《纳米技术与精密工程》2015年第2期120-127,共8页Nanotechnology and Precision Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA041201);天津市自然科学基金资助项目(13JCYBJC18000)

摘　　要：漏磁式管道内检测器广泛应用于长距离输油管道缺陷检测中,声学地面标记器作为管道外定位装置的重要组成部分,具有重要的研究价值.然而当管道埋地深度超过4 m时,由声学地面标记器采集到的管道内检测器与管道的摩擦声信号被噪声淹没,不能提取定位信息.为了解决摩擦声信号信噪比低的问题,提出采用声传感器阵列技术对摩擦声信号进行增强.根据管道内检测器与管壁摩擦声的特征,研究合适的时延估计方法,精确得到几路传感器的时延,再利用延迟-相加波束形成的方法抑制噪声,提高摩擦声的信噪比,增加基于摩擦声的地面标记方法的检测深度.为了验证声传感器阵列对管道内检测器摩擦声信号的增强效果,在河北廊坊中石化管道局的2.5 km长管道上进行多次现场实验,实验结果表明延迟-相加波束形成算法能够将摩擦声的信噪比提高了20 d B,并且有效的埋地管道检测深度可增至8 m.Acoustic above ground marking device is an important part of the outer location system in magnetic flux leakage pipeline inspection gauge（ MFL PIG）,which is widely used in long-range pipeline inspection. However,the friction signals acquired by acoustic above ground markers（ AGMs） are normally too weak to be extracted from the strong noise when pipelines are buried deeper than 4 m. To solve this problem,acoustic sensor array technology,in conjunction with the development of delay-and-sum beam forming algorithm,was applied to enhancing the friction singal. To verify the effectiveness of acoustic sensor array and signal enhancement algorithm,experiments were carried out on a 2. 5 km long pipeline on site in the Sinopec Pipeline Technology Ltd. Langfang,Hebei Province,China. The results show that signal-noise ratio（ SNR） of the friction signals acquired by sensor array increased by approximately20 d B,and effective inspection depth of the buried pipeline can reach 8 m.

关 键 词：管道检测 传感阵列 信号增强 延迟-相加波束形成 

分 类 号：TN911.7[电子电信—通信与信息系统]