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(11)

EP 4 409 282 A1

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(43) Date of publication: 07.08.2024 Bulletin 2024/32 (21) Application number: 22783317.5 (22) Date of filing: 13.09.2022

(51) International Patent Classification (IPC):  G01N 33/24(2006.01) G01V 9/02(2006.01) G01V 5/04(2006.01) G01N 23/22(2018.01) G01N 9/24(2006.01) G01N 23/02(2006.01) (52) Cooperative Patent Classification (CPC): G01N 33/246; G01N 23/22; G01N 2223/205; G01N 2223/616; G01N 9/24; G01N 23/02 (86) International application number: PCT/EP2022/075356 (87) International publication number: WO 2023/046527 (30.03.2023 Gazette 2023/13)

(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: 27.09.2021 GB 202113746 (71) Applicant: Geoptic Infrastructure Investigations Limited South Warnborough RG29 1SD (GB)	(72) Inventors: STEER, Christopher Andrew South Warnborough RG29 1SD (GB) THOMPSON, Lee Frederick South Warnborough RG29 1SD (GB) GLUYAS, Jonathan Gordon South Warnborough RG29 1SD (GB) STOWELL, John Patrick South Warnborough RG29 1SD (GB) (74) Representative: Haseltine Lake Kempner LLP  Cheapside House 138 Cheapside London EC2V 6BJ London EC2V 6BJ (GB)