Abstract: An acoustic antenna intended to equip a sonar, the antenna being centred around a first longitudinal axis and includes at least a first assembly of at least two transducers and a second assembly of at least two transducers stacked along the longitudinal axis, each transducer having at least a radial mode having a resonance frequency, referred to as the radial frequency, and a cavity mode having a resonance frequency, referred to as the cavity frequency, wherein the transducers of the first assembly are configured to transmit sound waves in a first continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the first assembly and the transducers of the second assembly are configured to transmit sound waves in a second continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the second assembly, in that the cavity frequency of a transducer of the second assembly is equal to the radial frequency of a transducer o

Abstract: An acoustic antenna intended to equip a sonar, the antenna being centred around a first longitudinal axis and includes at least a first assembly of at least two transducers and a second assembly of at least two transducers stacked along the longitudinal axis, each transducer having at least a radial mode having a resonance frequency, referred to as the radial frequency, and a cavity mode having a resonance frequency, referred to as the cavity frequency, wherein the transducers of the first assembly are configured to transmit sound waves in a first continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the first assembly and the transducers of the second assembly are configured to transmit sound waves in a second continuous frequency band extending at least between the cavity and radial frequencies of the transducers of the second assembly, in that the cavity frequency of a transducer of the second assembly is equal to the radial frequency of a transducer o

Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: An electro-optical transducer includes a section of optical fiber including a sensitive area conveying an optical signal representative of an elongation of the sensitive area, the section of optical fiber being taut and extending longitudinally at rest substantially along a longitudinal axis, a piezoelectric actuator including at least one piezoelectric assembly including a piezoelectric bar, the piezoelectric bar extending longitudinally at rest substantially parallel to the longitudinal axis, the piezoelectric bar being provided with a pair of electrodes between which the piezoelectric bar is intended to be supplied with electric power by way of an electrical signal delivered by a sensor, the piezoelectric bar being intended to deform essentially through expansion or contraction of said bar parallel to the longitudinal axis in response to a variation in the electrical signal and being coupled mechanically to the section of optical fiber such that this expansion or contraction of the piezoelectric bar brings

Abstract: An omnidirectional antenna to equip a sonar, the antenna centered around a longitudinal axis and comprises an assembly of emission rings stacked along the longitudinal axis, each emission ring formed around the longitudinal axis. The emission rings are assembled in groups of ring, the antenna comprises at least two groups of rings and each group of rings comprises at least two rings, the inter-ring spacings between the rings of one and the same group and the inter-group spacings between two successive groups of rings chosen so as to optimize the emission bandwidth and the sound level.

Abstract: A compact omnidirectional antenna for dipping sonar comprises multiple elementary transmission rings formed around a longitudinal axis of the antenna and multiple hydrophones distributed around the longitudinal axis, the antenna intended to be dipped in water, the hydrophones separate from the elementary transmission rings, the hydrophones and the elementary transmission rings fixed in the antenna. The elementary transmission rings and the hydrophones are interlinked along one and the same height (H) measured along the longitudinal axis.

Abstract: The invention relates to a process for the collective fabrication of a remotely interrogable sensor having at least one first resonator and one second resonator. Each resonator exhibits respectively a first and a second operating frequency. A first series of first resonators are fabricated. The first resonators each have a first operating frequency belonging to a first set of frequencies centered on a first central frequency. A second series of second resonators are fabricated. The second resonators each having a second operating frequency belonging to a second set of frequencies centered on a second central frequency. A series of pairings of a first resonator and of a second resonator are conducted so as to form pairs of resonators exhibiting a difference of operating frequencies which is equal to the difference of the first and second central frequencies.