FN Archimer Export Format
PT C
TI Detection de fissure sur structure en mer en presence de salissure marine projet "Crabe"
OT Underwater crack detection on offshore steel structures in presence of marine fouling (use of the ROV).
BT 
AF DASTE, S
AS 1:;
FF 1:;
UR https://archimer.ifremer.fr/doc/1990/acte-1161.pdf
LA French
DT Proceedings paper
DE ;Offshore structures;Fouling;Underwater exploration;Steel structures;Sensors;Cracks;Detection;Unmanned vehicles;Marine technology
AB The "CRABE" method is a crack detection technique based on the use of low electromagnetic frequencies. This (patented) method relies on a global injection of current within the structure under inspection. The presence of a crack shall cause a disruption in the current flow, and consequently of the magnetic field off the surface in the vicinity of a defect. It is this magnetic signature which is detected by the magnetic sensor used with "CRABE". The major advantage of this process, developed by TRAVOCEAN and the LETI Division of CEA with the help of IFREMER, appears clearly: No preliminary cleaning of the welds to be inspected is required, since no contact is necessary. Similarly, it shall be possible to inspect the whole of structures to a total cost all the more reduced than the detection equipment can be operated by means of a ROV (Remotely Operated Vehicle). 
PY 1990
PD DEC
CT Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991
ID 1161
ER

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