A real-time non-contact monitoring method of subsea pipelines Dalei Song, Xueyan Ma, Xinjian Fan, Guojia Hou, Jixing Sun, Weiguo Shi and Qingzhong Li MATEC Web of Conferences, 34 (2015) 04009 Published online: 11 December 2015 DOI: 10.1051/matecconf/20153404009