The invention relates to a device for detecting faults of a structure (STR), the device comprising a calculation unit and a plurality of transducers (100) intended to be positioned on or in the structure (STR), first transducers (E) of the plurality de transducers (100) being capable of being in an emission mode, second transducers (R) of the plurality of transducers (100) being capable of being in a reception mode, characterized in that the first transducers (E) form a hexagonal meshing so as to delimit between them several mutually adjacent mesh cells, the second transducers (R) being positioned on respective emission circles of the first transducers (E), each emission circle of a first transducer (E) being centered on the first transducer (E).