Transducer
OwnerDehua Huang, M. A. Breazealeinventors
Life of this patent
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Abstract
A transducer apparatus and method for generating sonic sound waves having a far field wavefront amplitude pattern in a Bessel or Gaussian distribution is disclosed. The transducer includes a piezoelectric element having uniformly poled dipoles formed therein. An unpoled backing body having the same dielecctric constant as the piezoelectric element contacts and is attached to the piezoelectric element. An indentation shaped to produce a beam amplitude distribution of a predetermined function is formed on the backing body.
Claims23
A transducer for generating sonic waves comprising:
- a piezoelectric element having dipoles formed therein, and an external surface extending in a plane;
- an unpoled backing element having a first surface contacting the piezoelectric element and a second surface opposite to the first surface having an indentation formed therein, the indentation shaped to produce a beam distribution of a predetermined function, the dielectric constant of the unpoled backing element being substantially the same as the dielectric constant of the piezoelectric element;
- a first electrode contacting the external surface of the piezoelectric element;
- and
- a second electrode contacting the indentation.
A transducer for generating sound waves having a Gaussian function wavefront amplitude distribution comprising:
- a piezoelectric element having dipoles formed therein, and an external surface extending in a plane;
- an unpoled backing element having a first surface contacting the piezoelectric element and a second surface opposite to the first surface having a spherical indentation formed therein, the backing element having substantially the same dielectric constant as the dielectric constant of the piezoelectric element:
- a first electrode formed on the external surface of the piezoelectric element;
- a second electrode formed on the spherical indentation.
A method for generating sound waves having a far field pattern shaped in accordance with a predetermined function comprising the steps of:
- a) providing a planar piezoelectric element having uniformally poled dipoles formed therein;
- b) attaching a planar backing body to the piezoelectric element in which the body has substantially the same dielectric constant as the piezoelectric element;
- c) shaping an indentation into the backing body, the shape of the indentation being in accordance with the desired pattern;
- d) generating an energizing voltage across the element and body to induce the element to vibrate and produce said shaped sound waves.
A method of generating sound waves comprising:
- vibrating a planar piezoelectric element having dipoles formed therein by applying a voltage across a piezoelectric element and a backing element, the backing element having a first surface contacting the piezoelectric element and a second surface opposite to the first surface which as an indentation shaped to produce sound waves having a distribution of a predetermined function, the dielectric constant of the backing element being substantially the same as the piezoelectric element.
Dependencies are inferred from the claim text.