Apparatus for the investigation of media by ultrasonic echography, comprising an array of piezoelectric transducer elements

摘要

ultrasound exploration apparatus comprising a media system (10) for ultrasonic linear or two-dimensional piezoelectric transducer elements, respectively (10 (1), (2), 10 (n)) of length l and width w, a stage show and a repeated ultrasonic signals n the floor of the reception and processing of ultrasonic echoes are received.the thickness t is equal to half of the wave length corresponding to a first frequency (f) for which it exists, on the two-dimensional graph curves f t = f (w / t) curves on the graph tridimensionu00adnel respectively.t = f (w / t, l / t), dispersion of the resonance frequencies, a first vibration mode at the first frequency (f) and a second vibration mode at a frequency equal to or near the second floor 2f. broadcast includes a signal generator for excitation to the first. u00e9quence, the spectrum of the excitation signal from at least the second frequency.