Wideband, derivative-matched, continuous aperture acoustic transducer

• US 5,327,397 A
• Filed: 05/27/1993
• Issued: 07/05/1994
• Est. Priority Date: 03/29/1991
• Status: Expired due to Term

• Current Assignee: Charles Stark Draper Laboratory Incorporated
• Original Assignee: Charles Stark Draper Laboratory Incorporated
• Inventors: Hubbard, James E. Jr., Burke, Shawn E.
• Primary Examiner(s): Eldred, J. Woodrow
• Application Number:
  US08/068,996
• Time in Patent Office: 404 Days
• Field of Search: 367/103, 367/105, 367/119, 367/121, 367/122, 367/124, 367/125, 367/126, 367/129, 367/153, 367/157, 367/905, 310/322, 310/334, 310/337
• US Class Current: 367/103
• CPC Class Codes: 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
• CPC Class Codes: B06B 1/0644 using a single piezoelectric element B06B1/0688 takes precedence

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

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.

2. 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.

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.

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.

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.