Abstract: A slip ring for optical fibers includes a first part and a second part that is able to rotate with respect to the first part, the slip ring comprising at least one data transmission channel comprising an optical/electrical converter for transforming an optical signal conveyed by an optical fiber into a first electrical signal, at least one optical emitter, receiving the first electrical signal so as to emit a light beam, at least one optical detector for detecting the light beam and for transforming it into a second electrical signal, the emitter being contained in the first part and the detector being contained in the second part, or vice versa, and an electrical/optical converter to which the second electrical signal is transmitted such that the electrical/optical converter generates another optical signal intended to be conveyed on another optical fiber.

Abstract: A piezoelectric hydrophone with perforations and an array comprising a plurality of hydrophones comprises a stack of layers that are bonded to one another, the layers comprising at least one piezoelectric layer and a plurality of layers referred to as rigid layers, at least two of which are electrode layers, the rigid layers exhibiting a stiffness perpendicularly to the direction of stacking, which stiffness is higher than the stiffness of the piezoelectric layer perpendicularly to the direction of stacking. At least one piezoelectric layer comprises a central zone comprising a set of perforations that pass through the piezoelectric layer solely along the direction of stacking, each perforation being closed tight by closure elements comprising portions of two of the rigid layers, the two rigid layers extending over the entirety of the surface of the central zone.

Abstract: A slip ring for optical fibers includes a first part and a second part that is able to rotate with respect to the first part, the slip ring comprising at least one data transmission channel comprising an optical/electrical converter for transforming an optical signal conveyed by an optical fiber into a first electrical signal, at least one optical emitter, receiving the first electrical signal so as to emit a light beam, at least one optical detector for detecting the light beam and for transforming it into a second electrical signal, the emitter being contained in the first part and the detector being contained in the second part, or vice versa, and an electrical/optical converter to which the second electrical signal is transmitted such that the electrical/optical converter generates another optical signal intended to be conveyed on another optical fiber.

Abstract: A piezoelectric hydrophone with perforations and an array comprising a plurality of hydrophones comprises a stack of layers that are bonded to one another, the layers comprising at least one piezoelectric layer and a plurality of layers referred to as rigid layers, at least two of which are electrode layers, the rigid layers exhibiting a stiffness perpendicularly to the direction of stacking, which stiffness is higher than the stiffness of the piezoelectric layer perpendicularly to the direction of stacking. At least one piezoelectric layer comprises a central zone comprising a set of perforations that pass through the piezoelectric layer solely along the direction of stacking, each perforation being closed tight by closure elements comprising portions of two of the rigid layers, the two rigid layers extending over the entirety of the surface of the central zone.