Sidney G Allison

US Patent:

7580323, Aug 25, 2009

Filed:

May 23, 2006

Appl. No.:

11/419818

Inventors:

Sidney G. Allison - Williamsburg VA, US
Qamar A. Shams - Yorktown VA, US
Robert L. Fox - Hayes VA, US
Melanie L. Fox Chattin, legal representative - Hayes VA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Adninistration - Washington DC

International Classification:

G02B 6/00

US Classification:

367140, 25022714

Abstract:

An optical assembly is formed by one or more piezoelectric fiber composite actuators having one or more optical fibers coupled thereto. The optical fiber(s) experiences strain when actuation voltage is applied to the actuator(s). Light passing through the optical fiber(s) is wavelength tuned by adjusting the actuation voltage.

US Patent:

7732998, Jun 8, 2010

Filed:

Aug 3, 2006

Appl. No.:

11/462114

Inventors:

Sidney G. Allison - Williamsburg VA, US
Qamar A. Shams - Yorktown VA, US
Robert L. Fox - Hayes VA, US
Melanie L. Fox Chattin, legal representative - Hayes VA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

H01L 41/04
H01L 41/08

US Classification:

310369, 310365

Abstract:

A telescoping actuator assembly includes a plurality of cylindrical actuators in a concentric arrangement. Each cylindrical actuator is at least one piezoelectric fiber composite actuator having a plurality of piezoelectric fibers extending parallel to one another and to the concentric arrangement's longitudinal axis. Each cylindrical actuator is coupled to concentrically-adjacent ones of the cylindrical actuators such that the plurality of cylindrical actuators can experience telescopic movement. An electrical energy source coupled to the cylindrical actuators applies actuation energy thereto to generate the telescopic movement.

US Patent:

51091950, Apr 28, 1992

Filed:

Dec 12, 1989

Appl. No.:

7/449209

Inventors:

Sidney G. Allison - Poquoson VA
Min Namkung - Tabb VA
William T. Yost - Newport News VA
John H. Cantrell - Tabb VA

International Classification:

G01R 3312
G01N 2780

US Classification:

324235

Abstract:

A method and apparatus for testing steel components for temper embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be umembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.

US Patent:

49124110, Mar 27, 1990

Filed:

Jun 23, 1988

Appl. No.:

7/210486

Inventors:

Sidney G. Allison - Poquoson VA
Min Namkung - Tabb VA
William T. Yost - Newport News VA
John H. Cantrell - Tabb VA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

G01R 3312
G01N 2780

US Classification:

324235

Abstract:

A method and apparatus for testing steel components for temper embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be unembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.

US Patent:

51506203, Sep 29, 1992

Filed:

Jun 19, 1991

Appl. No.:

7/717755

Inventors:

Sidney G. Allison - Poquoson VA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

F16B 3102

US Classification:

7386259

Abstract:

The present invention is a method of recertifying a loaded bearing member using ultrasound testing to compensate for different equipment configurations and temperature conditions. The standard frequency F1 of a reference block is determined via an ultrasound tone burst generated by a first pulsed phase locked loop (P2L2) equipment configuration. Once a lock point number s is determined for F1, the reference frequency F1a of the reference block is determined at this lock point number via a second P2L2 equipment configuration to permit an equipment offset compensation factor Fo1=((F1-F1a)/F1)(1000000) to be determined. Next, a reference frequency F2 of the unloaded bearing member is determined using the second P2L2 equipment configuration and is then compensated for equipment offset errors via the relationship F2c=F2+F2(Fo1)/1000000. A lock point number b is also determined for F2. A resonant frequency F3 is determined for the reference block using a third P2L2 equipment configuration to determine a second offset compensation factor Fo2 (=(((F1-F3)/F1) 1000000).

US Patent:

51171848, May 26, 1992

Filed:

Nov 2, 1990

Appl. No.:

7/608504

Inventors:

Sidney G. Allison - Poquoson VA
Min Namkung - Tabb VA
William T. Yost - Newport News VA
John H. Cantrell - Tabb VA

International Classification:

G01R 3312
G01R 2772

US Classification:

324239

Abstract:

A method and apparatus for testing steel components for temper embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be unembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.

US Patent:

51210584, Jun 9, 1992

Filed:

Apr 15, 1991

Appl. No.:

7/686263

Inventors:

Sidney G. Allison - Poquoson VA
Min Namkung - Tabb VA
William T. Yost - Newport News VA
John H. Cantrell - Tabb VA

Assignee:

Administrator, National Aeronautics and Space Administration - Washington DC

International Classification:

G01R 3312
G01N 2780
G01N 2900

US Classification:

324235

Abstract:

A method and apparatus for testing steel components for temperature embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be umembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.