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(11)

EP 3 908 853 A1

(12)

(43) Date of publication: 17.11.2021 Bulletin 2021/46 (21) Application number: 20766812.0 (22) Date of filing: 05.03.2020

(51) International Patent Classification (IPC):  G01S 17/89(2020.01) G01S 7/4913(2020.01) G01S 7/481(2006.01) (52) Cooperative Patent Classification (CPC): G01S 7/4863; G01S 7/4876; G01S 7/4868; G01S 17/89; G01S 7/4815; G01S 7/499; G01S 7/4816 (86) International application number: PCT/US2020/021109 (87) International publication number: WO 2020/181048 (10.09.2020 Gazette 2020/37)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 06.03.2019 US 201962814452 P (71) Applicants: Sense Photonics, Inc. Durham, North Carolina 27709 (US) The University Court Of The University of Edinburgh Edinburgh EH8 9YL (GB)

(72) Inventors: HENDERSON, Robert Edinburgh EH9 1NR (GB) AL ABBAS, Tarek Edinburgh EH16 5PX (GB) CALDER, Neil Edinburgh EH12 6LB (GB) FINKELSTEIN, Hod Berkeley, California 94708 (US) (74) Representative: Yeadon IP Limited  Nexus Discovery Way Leeds LS2 3AA Leeds LS2 3AA (GB)