Ken K Deng

US Patent:

7104140, Sep 12, 2006

Filed:

Dec 15, 2004

Appl. No.:

11/011198

Inventors:

Lichun Zou - Vienna VA, US
Ken Kan Deng - Potomac MD, US

Assignee:

Wilcoxon Research, Inc. - Gaithersburg MD

International Classification:

G01B 7/16

US Classification:

73777

Abstract:

A piezoelectric flexural sensing structure having increased sensitivity and decreased noise, without sacrifice of the sensor bandwidth. The structure is made up of a proof mass, a beam with a base and optionally having castellated bonding surfaces and two poled bonding mode PMN-PT crystal plates mounted on the beam.

US Patent:

8638956, Jan 28, 2014

Filed:

Jul 29, 2010

Appl. No.:

12/845794

Inventors:

Ken K. Deng - North Potomac MD, US

International Classification:

H04R 25/00

US Classification:

381162, 381171, 381174, 381369, 367178, 367182

Abstract:

Embodiments of a directional acoustic sensor or acoustic velocity microphone are disclosed that include a sensor frame structure, a support means, and a buoyant object. The buoyant object is suspended in the sensor frame structure using the support means. The buoyant object has a feature size smaller than a wavelength of the highest frequency of an acoustic wave in air. The buoyant object receives three-dimensional movement of the air excited by the acoustic wave. The three-dimensional movement that the buoyant object receives is detected using a detection means. A particle velocity of the acoustic wave is derived from the three-dimensional movement of the buoyant object using the detection means. The detection means can be an optical detection means, an electromagnetic detection means, or an electrostatic detection means. An acoustic image of the acoustic wave can be determined by distributing two or more directional acoustic sensors a multi-dimensional array.

US Patent:

20040020292, Feb 5, 2004

Filed:

Apr 17, 2003

Appl. No.:

10/417154

Inventors:

Ken Deng - North Potomac MD, US

International Classification:

G01P015/09

US Classification:

073/514340, 029/595000, 029/025350

Abstract:

The present invention is directed to a sensing structure comprising four components: a central block proof mass, a continuous belt-shaped membrane (or one having another suitable shape), a piezoelectric sensing layer placed on top of the membrane, and a fixed mounting frame. Electrodes are attached to the top and the underside of the piezoelectric sensing layer. The structure results in an axisymmetric stress distribution.

US Patent:

20050034519, Feb 17, 2005

Filed:

Jul 9, 2004

Appl. No.:

10/887347

Inventors:

Ken Deng - Potomac MD, US

International Classification:

G01N029/02

US Classification:

073514340

Abstract:

The present invention is directed to an acoustic vector sensor, specifically an underwater acoustic vector sensor. The acoustic vector sensor contains three piezoelectric sensors orthogonally mounted inside a rigid housing, where each of the piezoelectric sensors measures acoustic energy from one of the three different, orthogonal, axial directions (X, Y, and Z). The piezoelectric sensor contains a proof mass, a base, and a piezoelectric crystal sandwiched therebetween. The bonding surfaces of the proof mass and the base are preferably castellated; and the piezoelectric crystal is preferably a shear mode (d) relaxor single crystal.

US Patent:

20050057123, Mar 17, 2005

Filed:

Jul 9, 2004

Appl. No.:

10/887216

Inventors:

Ken Deng - Potomac MD, US

International Classification:

H01L041/08

US Classification:

310339000

Abstract:

A piezoelectric vibration energy harvesting device which is made up of a base, a proof mass, and a cymbal stack disposed between the base and the proof mass. The cymbal stack has a piezoelectric element disposed between the base and the proof mass, a first cymbal-shaped cap disposed between the proof mass and the piezoelectric crystal, and a second cymbal-shaped cap disposed between the piezoelectric crystal and the base.

US Patent:

20070119259, May 31, 2007

Filed:

Sep 1, 2006

Appl. No.:

11/515416

Inventors:

Lichun Zou - Vienna VA, US
Ken Deng - Potomac MD, US

International Classification:

G01B 7/16

US Classification:

073777000

Abstract:

A piezoelectric flexural sensing structure having increased sensitivity and decreased noise, without sacrifice of the sensor bandwidth. The structure is made up of a proof mass, a beam with a base and optionally having castellated bonding surfaces and two poled bending mode relaxor piezoelectric crystal plates mounted on the beam.

US Patent:

20130312522, Nov 28, 2013

Filed:

Feb 7, 2012

Appl. No.:

13/984255

Inventors:

Ken Kan Deng - Gaithersburg MD, US

Assignee:

ION Geophysical Corporation - Houston TX

International Classification:

G01P 15/09

US Classification:

7351433, 7351436, 7351434

Abstract:

Methods and apparatuses are disclosed that assist in sensing underwater signals in connection with geophysical surveys. One embodiment relates to a transducer including a cantilever coupled to a base. The cantilever may include a beam and a first coupling surface angularly oriented from the beam, and the base may include a second coupling surface angularly oriented from the beam and substantially parallel to the first coupling surface of the cantilever. The transducer may further include a sensing material coupled between the first coupling surface of the cantilever and the second coupling surface of the base.

US Patent:

20130319118, Dec 5, 2013

Filed:

Feb 7, 2012

Appl. No.:

13/984266

Inventors:

Ken Kan Deng - Gaithersburg MD, US

Assignee:

ION Geophysical Corporation - Houston TX

International Classification:

H02N 1/00
G01P 15/18
G01V 13/00

US Classification:

7351432, 29594, 427 79, 310300

Abstract:

Methods, apparatuses, and systems are disclosed for forming a transducer. The transducer may include a bottom plate formed from a first sheet of material, a top plate formed from a second sheet of material, and a middle portion. The middle portion includes a mid-upper element formed from a third sheet of material, the mid-upper element having a mid-upper frame, a mid-upper mass, and a plurality of mid-upper attachment members coupling the mid-upper mass to the mid-upper frame. The middle portion also may include a central element formed from a fourth sheet of material, the central element having a central frame and a central mass.