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Indexed by:期刊论文

Date of Publication:2012-10-01

Journal:OPTICS AND LASER TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:44

Issue:7

Page Number:2125-2129

ISSN No.:0030-3992

Key Words:Subsea pipeline; Scour monitoring; Brillouin optical sensors

Abstract:A scour monitoring system of subsea pipeline is proposed using distributed Brillouin optical sensors based on active thermometry. The system consists in a thermal cable running parallel to the pipeline, which acquires frequency shift of optical sensors during heating and cooling, directly indicating temperature change. The free spans can be detected through the different behaviors of heat transfer between in-water and in-sediment scenarios. Three features were extracted from temperature time histories including magnitude, spatial continuity and temporal stability. Several experimental tests were conducted using the proposed system. The results substantiate the monitoring technique. (c) 2012 Elsevier Ltd. All rights reserved.