# US 5,327,397 A · Wideband, derivative-matched, continuous aperture acoustic transducer

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- Number: US 5,327,397 A
- Document ID: US5327397A
- Status: Granted
- Kind: A
- Application number: 08/068,996
- Filed: 1993-05-27
- Granted: 1994-07-05
- Earliest claimed: 1991-03-29
- Assignees: The Charles Stark Draper Laboratories, Inc.
- Inventors: Shawn E. Burke; James E. Hubbard, Jr.
- Web page: https://patentgrep.com/patent/US5327397A

## CPC

- B06B 1/0644: {using a single piezoelectric element (B06B1/0688 takes precedence)}
- B06B 1/0207: {Driving circuits (specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03)}
- B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R)

## Abstract

A wideband, derivative-matched, continuous aperture acoustic transducer includes a first sensor area having a predetermined spatial shading and a second sensor area having a spatial shading which is the spatial derivative of the spatial shading of the first area; the first and second spatial shaded areas are superimposed and co-extensive along the sensing axis.

## Claims

### Claim 1

A wideband, derivative-matched, continuous aperture acoustic transducer, comprising:
a first sensor medium including a first sensor area having a predetermined spatial shaping;
a second sensor medium including a second sensor area having a spatial shading which is the spatial derivative of the spatial shading of said first area; said first and second spatially shaded areas being superimposed and coextensive along the sensing axis; and
a pair of electrodes about said first and second sensor mediums.

### Claim 2 (depends on 1)

The wideband, derivative-matched, continuous aperture acoustic transducer of claim 1 in which said first and second sensor areas are defined by a said electrode.

### Claim 3

A wideband, derivative-matched, continuous aperture acoustic transducer, comprising:
a first triangular sensor area having a predetermined spatial shading; and
a second rectangular sensor area having a spatial shading which is the spatial derivative of the spatial shading of said first area; said first and second spatially shaded areas being superimposed and coextensive along the sensing axis.

### Claim 4

A wideband, derivative-matched, continuous aperture acoustic transducer, comprising:
a first sinusoidal sensor area having a predetermined spatial shading; and
a second cosinusoidal sensor area having a spatial shading which is the spatial derivative of the spatial shading of said first area; said first and second spatially shaded areas being superimposed and coextensive along the sensing axis.

### Claim 5

A wideband, derivative-matched, continuous aperture acoustic transducer, comprising:
a first sensor area having a predetermined spatial shading;
a second sensor area having a spatial shading which is the spatial derivative of the spatial shading of said first area; said first and second spatially shaded areas being superimposed and coextensive along the sensing axis; and
a third sensor area superimposed on the first and second sensor areas and having a plurality of independent sensor sections.