Abstract: The invention relates to a matrix array of ultrasonic transducer elements comprising a plurality of transducer elements that are distributed over a distribution area, each of the transducer elements being suitable for emitting, from an emission surface, ultrasound at a frequency comprised between 100 kHz and 100 MHz, wherein: each of the transducer elements is configured to emit ultrasound divergently at least level with the working volume; the largest dimension of the emission area of each of said transducer elements is larger than 1.5 times the wavelength of the ultrasound in water at 30° C.; and the distribution of the transducer elements over the distribution area of the array is aperiodic.

Abstract: The invention relates to a matrix array of ultrasonic transducer elements (1) comprising a plurality of transducer elements (1) that are distributed over a distribution area, each of the transducer elements (1) being suitable for emitting, from an emission area (3), ultrasounds at a frequency comprised between 100 kHz and 100 MHz, wherein: each of the transducer elements (1) is configured to emit ultrasounds in a divergent manner at least at the level of the working volume; said transducer elements (1) each have a largest dimension of their emission area greater than 1.5 times the wavelength of the ultrasounds in water at 30° C.; the distribution of the transducer elements (1) over the distribution area of the array is aperiodic.

Abstract: The endoscopic probe, more especially for medical use, comprises a tubular member insertable in a cavity to be explored, having a flexible part ending in an endmost section able to be orientated by means of mechanical control means disposed inside the flexible section. The section carries optical illumination and image return means and an ultrasonic electro-acoustic translater. This translator comprises a fixed curved linear array of piezoelectric elements, the convexity of the curve being directed outwardly. The array is associated with an electronic circuit for energizing the elements according to a sectorial sweep sequence in an angular field overlapping with the field of view of the optical means.

Abstract: The invention relates to the automatic stabilisation of aircraft, inter alia helicopters.The position of the anchorage point of piloting channels, inter alia for roll and pitch, is determined by trim motors disposed inside mechanical relays. On the basis of data received from a control column and from an automatic pilot which acts on servo controls, a logic arrangement controls parallel electronic switches which by way of parallel lines permit energisation of the trim motors in a motor priority order determined by action on the bases of the electronic switches.