Acoustic device

Details Acoustic device Acoustic device

1992-02-04

1994-09-27

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

367150, 367157, 310335, 333144, 333147, 333152, H04R 1700

Patent

active

053512197

ABSTRACT:
An acoustic device has an acoustic wave propagating medium exhibiting elastic abnormality in the vicinity of a Curie temperature. It is desirable that such an acoustic wave propagating medium be formed of a ferroelectric substance or a high-elastic substance and, in particular, have a Curie temperature at normal temperatures. For example, such ferroelectric substance is a solid solution expressed by Cs(Pb.sub.1-x Sr.sub.x)(Cl.sub.1-y Br.sub.y).sub.3 or (Bi.sub.1-x Dy.sub.x)VO.sub.4. By changing values of x and y appropriately, the Curie temperature of the solid solution can be varied, and an acoustic wave propagating medium meeting the purpose of use can be obtained. In such an acoustic wave propagating medium, an elastic coefficient C.sup.P at the time of constant polarization differs greatly from an elastic coefficient C.sup.E at the time of a constant electric field in the vicinity of the Curie temperature. Accordingly, the propagation velocity of acoustic waves is greatly different, too. By varying the elastic coefficients of the acoustic wave propagating medium, various novel acoustic devices utilizing the above characteristics can be obtained.

REFERENCES:
patent: 3737811 (1973-06-01), Paige
patent: 3790907 (1974-02-01), Alexander
patent: 3840826 (1974-10-01), Toda et al.
patent: 3848144 (1974-11-01), Schissler
patent: 4401956 (1983-08-01), Joshi
patent: 4452084 (1984-06-01), Taenzer
Development of a 12 Element Annular Array Transducer for Realtime Ultrasound Imaging; Foster et al; Ultrasound in Med. & Biol., vol. 15, No. 7, pp. 649-659, 1989.
Handbook on Ultrasonic; 3. Practical Application of Ultrasonic to a Circuit Device; 3-1 Ultrasonic Delay Lines, pp. 765-789.
Physica B 150 (1988), The Ferroelastic Transition in Some Scheelite-Type Crystals, Yoshihiro Ishibashi et al, pp. 258-264.

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