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.