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a group of the piezoelectric wandlerelemente comprehensive device for the study of media through ultraschallechographie.
a group of the piezoelectric wandlerelemente comprehensive device for the study of media through ultraschallechographie.
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机译：一组用于通过超示踪法研究介质的压电wandlerelemente综合装置。
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摘要
An apparatus for the examination of objects with ultrasound, comprising a linear or two-dimensional array (10) of piezo-electric transducer elements (10 (1), . . . , 10 (n)) with a length L and a width W, a stage for the repeated transmission of ultrasonic signals and a stage for the reception and processing of the ultrasonic echoes received. The thickness T of the elements is equal to half the wavelength corresponding to a first frequency F for which there exists, on the two-dimensional diagram of the curves FxT=f(W/T), or respectively, on the three-dimensional diagram of the curves FxT=f(W/T, L/T) of the distribution of the resonance frequencies, a first vibratory mode at the said first frequency F and a second vibratory mode at a second frequency equal to or near 2F. The transmission stage incorporates a generator (20) of excitation signals at the first frequency F, the spectrum of these excitation signals excluding at least the second frequency.
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