Kevin M Mccarthy

US Patent:

7151872, Dec 19, 2006

Filed:

Nov 22, 2005

Appl. No.:

11/284595

Inventors:

Hua Xia - Altamont NY, US
Kung-Li Justin Deng - Waterford NY, US
Kevin Thomas McCarthy - Troy NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/34

US Classification:

385 37, 385 12

Abstract:

A sensing module positioned about an optical fiber cable having a long axis. The optical fiber includes a core that transmits light through the optical fiber cable. The sensing module includes a first short-period fiber grating positioned about the core. A second short-period fiber grating is positioned about the core and at a distance along the long axis with respect to the first short-period fiber grating. At least one of a long-aperiod fiber grating and a long-period fiber grating is positioned between the first short-period fiber grating and the second short-period fiber grating. A fiber cladding is positioned around the long-period grating and/or the long-aperiod grating of the sensing module. A sensing skin is positioned about the fiber cladding and includes a chemical gas active material.

US Patent:

7336862, Feb 26, 2008

Filed:

Mar 22, 2007

Appl. No.:

11/689850

Inventors:

Hua Xai - Altamont NY, US
Mahadevan Balasubramaniam - Ballston Lake NY, US
Jie Jiang - Clifton Park NY, US
Huageng Luo - Clifton Park NY, US
Abdul Rahman Abdallah Al-Khalidy - Cohoes NY, US
Clayton Ming Young - Schenectady NY, US
Kevin Thomas McCarthy - Troy NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00
G02B 6/34

US Classification:

385 12, 385 37

Abstract:

A fiber optic sensor is provided. The fiber optic sensor includes a fiber core having a plurality of Bragg grating elements wherein, the grating elements comprise a periodic or a quasiperiodic modulated microcrystalline and rigid silicon dioxide tetrahedral structure and a cladding disposed about the fiber core.

US Patent:

7400789, Jul 15, 2008

Filed:

Aug 29, 2006

Appl. No.:

11/468162

Inventors:

Hua Xia - Altamont NY, US
Kung-Li Justin Deng - Waterford NY, US
Kevin Thomas McCarthy - Troy NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00

US Classification:

385 12, 385 37

Abstract:

A sensing module positioned about an optical fiber cable having a long axis. The optical fiber includes a core that transmits light through the optical fiber cable. The sensing module includes a first short-period fiber grating positioned about the core. A second short-period fiber grating is positioned about the core and at a distance along the long axis with respect to the first short-period fiber grating. At least one of a long-aperiod fiber grating and a long-period fiber grating is positioned between the first short-period fiber grating and the second short-period fiber grating. A fiber cladding is positioned around the long-period grating and/or the long-aperiod grating of the sensing module. A sensing skin is positioned about the fiber cladding and includes a chemical gas active material.

US Patent:

7421162, Sep 2, 2008

Filed:

Mar 22, 2005

Appl. No.:

11/086055

Inventors:

Kevin Thomas McCarthy - Troy NY, US
Kung-Li Justin Deng - Waterford NY, US
Hua Xia - Altamont NY, US
Michael Joseph Krok - Clifton Park NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/34
G02B 6/26

US Classification:

385 37, 385 12, 385 13

Abstract:

In accordance with one exemplary embodiment the invention provides a multi-parameter fiber optic sensing system with an aperiodic sapphire fiber grating as sensing element for simultaneous temperature, strain, NO, CO, Oand Hgas detection. The exemplary sensing system includes an aperiodic fiber grating with an alternative refractive index modulation for such multi-function sensing and determination. Fabrication of such quasiperiodic grating structures can be made with point-by-point UV laser inscribing, diamond saw micromachining, and phase mask-based coating and chemical etching methods. In the exemplary embodiment, simultaneous detections on multi-parameter can be distributed, but not limited, in gas/steam turbine exhaust, in combustion and compressor, and in coal fired boilers etc. Advantageously, the mapping of multiple parameters such as temperature, strain, and gas using sapphire aperiodic gratings improves control and optimization of such systems directed to improve efficiency and output and reduce emissions.

US Patent:

7469077, Dec 23, 2008

Filed:

May 14, 2008

Appl. No.:

12/120290

Inventors:

Hua Xia - Altamont NY, US
Kung-Li Justin Deng - Waterford NY, US
Kevin Thomas McCarthy - Troy NY, US
Avinash Vinayak Taware - Niakayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00

US Classification:

385 12, 385 13, 385 37

Abstract:

A sensing module positioned about an optical fiber cable having a long axis. The optical fiber includes a core that transmits light through the optical fiber cable. The sensing module includes a first short-period fiber grating positioned about the core. A second short-period fiber grating is positioned about the core and at a distance along the long axis with respect to the first short-period fiber grating. At least one of a long-aperiod fiber grating and a long-period fiber grating is positioned between the first short-period fiber grating and the second short-period fiber grating. A fiber cladding is positioned around the long-period grating and/or the long-aperiod grating of the sensing module. A sensing skin is positioned about the fiber cladding and includes a chemical gas active material.

US Patent:

7489835, Feb 10, 2009

Filed:

Mar 28, 2008

Appl. No.:

12/057446

Inventors:

Hua Xia - Altamont NY, US
Jeffrey Scott Goldmeer - Latham NY, US
Kevin Thomas McCarthy - Troy NY, US
Aditya Kumar - Schenectady NY, US
Ravindra Annigeri - Roswell GA, US
Ertan Yilmaz - Albany NY, US
Avinash Vinayak Taware - Rexford NY, US
Yu Zhao - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00

US Classification:

385 12

Abstract:

A fiber gas sensor includes a fiber core with first and second refractive index periodic modulated grating structures having different amplitude modulation profiles positioned about the fiber core. A fiber cladding is positioned about the first and second refractive index periodic modulated grating structures. A sensing layer is positioned about the fiber cladding of one of the refractive index periodic modulated grating structures. The sensing layer includes a sensing material made of a Pd-based alloy, such as nano-PdOx, nano-Pd(x)Au(y)Ni(1-x-y) or nano-Pd/Au/WOx. The fiber gas sensor provides a measurement of localized, temperature-corrected gas concentration and composition from a combustion environment. A reflection-based or a transmission-based sensing system with an array of one or more fiber gas sensors is also described.

US Patent:

7492980, Feb 17, 2009

Filed:

Apr 22, 2008

Appl. No.:

12/107340

Inventors:

Kevin Thomas McCarthy - Troy NY, US
Kung-Li Justin Deng - Waterford NY, US
Hua Xia - Altamont NY, US
Michael Joseph Krok - Clifton Park NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/34
G02B 6/26

US Classification:

385 12, 385 13, 385 37

Abstract:

In accordance with one exemplary embodiment the invention provides a multi-parameter fiber optic sensing system with an aperiodic sapphire fiber grating as sensing element for simultaneous temperature, strain, NO, CO, Oand Hgas detection. The exemplary sensing system includes an aperiodic fiber grating with an alternative refractive index modulation for such multi-function sensing and determination. Fabrication of such quasiperiodic grating structures can be made with point-by-point UV laser inscribing, diamond saw micromachining, and phase mask-based coating and chemical etching methods. In the exemplary embodiment, simultaneous detections on multi-parameter can be distributed, but not limited, in gas/steam turbine exhaust, in combustion and compressor, and in coal fired boilers etc. Advantageously, the mapping of multiple parameters such as temperature, strain, and gas using sapphire aperiodic gratings improves control and optimization of such systems directed to improve efficiency and output and reduce emissions.

US Patent:

7499605, Mar 3, 2009

Filed:

Sep 14, 2007

Appl. No.:

11/855457

Inventors:

Hua Xia - Altamont NY, US
Kevin Thomas McCarthy - Troy NY, US
Kung-Li Justin Deng - Waterford NY, US
Fulton Jose Lopez - Clifton Park NY, US
Aaron John Avagliano - Houston TX, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00
C03B 37/023

US Classification:

385 12, 385 37, 385123, 385126, 65385, 65390, 438 32

Abstract:

A method of fiber core material band gap engineering for artificially modifying fiber material properties is provided. The method includes doping the fiber core material with one or more atoms for enhancing photosensitivity to the fiber material. The method also includes co-doping the fiber core material with one or more ions for enhancing an amorphous network crosslink mean coordination number. The method further includes thermally annealing the fiber core material for widening the band gap of the fiber core material.