SG11202000451WA - Method and system for distributed acoustic sensing in a marine environment - Google Patents

Abstract

International Patent Classification: GO1H 9/00 (2006.01) 601V 8/24 (2006.01) (21) International Application Number: PCT/AU2018/050757 (22) International Filing Date: (25) Filing Language: (26) Publication Language: (30) Priority Data: 2017902820 18 July 2017 (18.07.2017) (72) Inventor; and (71) Applicant: ENGLUND, Mark Andrew [AU/AU]; 18 July 2018 (18.07.2018) English English AU 1a/1110 Middle Head Road, Mosman, New South Wales 2088 (AU). (74) Agent: FPA PATENT ATTORNEYS PTY LTD; ANZ Tower, 161 Castlereagh Street, Sydney, New South Wales 2000 (AU). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, (54) Title: METHOD AND SYSTEM FOR DISTRIBUTED ACOUSTIC SENSING IN A MARINE ENVIRONMENT 1 10 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) vitivio VIII oviolo 010 lID VIII OH Hu oimIE (19) World Intellectual Property Organization International Bureau (10) International Publication Number WO 2019/014721 Al (43) International Publication Date 24 January 2019 (24.01.2019) WIP0 I PCT Fig. 1 100 104 102 110 1 10EiC 2 5 114 106A no 106E 114 205 114 205 1 reseassaaressaares4 300krn Sensing Array Network W O 20 19/0 147 21 Al (57) : The present invention relates to a system for distributed acoustic sensing in a marine environment surrounding a repeater along a fibre-optic submarine communications cable. The system comprises at least one distributed acoustic sensing (DAS) unit. Each DAS unit further comprises a light source that is configured to transmit outgoing light in at least one fibre-optic sensing cable that is located in the marine environment and a receiver configured to receive reflected light that includes at least one optical property influ- enced by an acoustic disturbance in the marine environment. Each DAS unit further comprises an optical multiplexer for multiplexing optical signals onto the fibre-optic submarine communications cable via the repeater where the optical signals carry information on the at least influenced optical property. A method for distributed acoustic sensing in the marine environment is also disclosed. [Continued on next page] WO 2019/014721 Al IIMEDIMOMIDEIIMMEIONIMOIDEMillin#011 UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))