Wideband multifrequency acoustic transducer

B - Operations – Transporting – 06 – B

Patent

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Details

B06B 1/06 (2006.01) G10K 11/02 (2006.01)

Patent

CA 2194605

A multifrequency acoustic transducer with a wide band around each resonant frequency is disclosed. A .lambda./4-resonant back film (202) is inserted between a .lambda./2 active transmitting film (201) and the soft reflector (203) on which it is supported, and two adaptive films (204, 205) with impedances intended to optimise matching of the two frequencies obtained by inserting said back film are placed on said active plate. Thicknesses of said match plates are optimised using a model such as a Mason model on the basis of a value adjacent to .lambda./4 for the frequency to be matched. Sonar transducers useful both for sensing and for classification may thus be achieved.

L'invention concerne les transducteurs acoustiques multifréquences présentant une large bande autour de chaque fréquence de résonance. Elle consiste à insérer entre une lame active émettrice à lambda /2 (201) et le réflecteur mou (203) qui la supporte une lame arrière (202) résonnant en lambda /4 et à placer sur cette lame active deux lames d'adaptation (204, 205) dont les impédances sont prévues pour adapter au mieux les deux fréquences obtenues par l'insertion de cette lame arrière. Des épaisseurs de ces lames adaptatrices sont optimisées à l'aide d'un modèle par exemple de type Mason à partir d'une valeur proche de lambda /4 pour la fréquence à adapter. Elle permet de faire des transducteurs sonar fonctionnant aussi bien en détection qu'en classification.

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