Apparatus for the examination of objects with ultra-sound, comprising an array of piezo-electric transducer elements
作者： Patrick R. Pesque , Jean-Marie C. Nicolas
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摘要: An apparatus for the examination of objects with ultrasound, comprising a linear or two-dimensional array (10) piezo-electric transducer elements (10 (1), . , 10 (n)) length L and width W, stage repeated transmission ultrasonic signals reception processing echoes received. The thickness T is equal to half wavelength corresponding first frequency F which there exists, on diagram curves F·T=f(W/T), respectively, three-dimensional F·T=f(W/T, L/T) distribution resonance frequencies, vibratory mode at said second near 2F. incorporates generator (20) excitation F, spectrum these excluding least frequency.
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