Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-10-22
1987-12-22
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310319, 310334, 310368, H01L 4108
Patent
active
047148462
ABSTRACT:
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 F.multidot.T=f(W/T), or respectively, on the three-dimensional diagram of the curves F.multidot.T=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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Hybrid Linear and Matrix Acoustic Arrays, by M. Pappalardo, Ultrasonics, Mar. 1981, pp. 81-86.
An Acoustic Transducer Array for Medical Imaging-Part 1, by John D. Larson, III, Hewlett-Packard Journal, vol. 34 (1983) Oct., No. 10, Amstelveen, Nederland, pp. 17-22.
Nicolas Jean-Marie C.
Pesque Patrick R.
Budd Mark O.
Haken Jack E.
U.S. Philips Corporation
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