Michael Perry Matthews

US Patent:

6781698, Aug 24, 2004

Filed:

Sep 9, 2002

Appl. No.:

10/237325

Inventors:

Xudong Fan - Austin TX
Michael R. Matthews - Austin TX
Pranay G. Sinha - Columbia MD
Jerome C. Porque - Austin TX

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G01B 902

US Classification:

356477

Abstract:

A method for screening the quality of an optical component including the step of simulating the performance of the optical component. The step of simulating includes the step of measuring the optical phase of the optical component, wherein the step of measuring comprises indirectly measuring the optical phase of the optical component using a scanning laser having a scanning step size and a modulation frequency such that /. The light throughput R of the optical component is then measured. A transfer function H as a function of optical frequency is constructed where H()=R()exp[j ()], and the performance is simulated using the measured value of the optical phase and the light throughput into the transfer function.

US Patent:

6915044, Jul 5, 2005

Filed:

Jul 15, 2003

Appl. No.:

10/619776

Inventors:

Michael R. Matthews - Austin TX, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G02B006/34

US Classification:

385 37, 385 10, 385 14, 385 15, 359570

Abstract:

A tunable interferometer for creating gratings of variable periodicity in an optical waveguide is disclosed. The interferometer includes a beam splitter for producing first and second write beams from an input beam. First and second reflectors receive the first and second write beams, respectively, from the beam splitter and direct the first and second write beams to intersect at a fixed location. The angle of intersection of the first and second write beams is a function of impingement locations of the first and second write beams on the first and second reflectors. The impingement locations of the first and second write beams on the first and second. reflectors may be varied to vary the angle of intersection at the fixed location.

US Patent:

7477060, Jan 13, 2009

Filed:

Dec 27, 2005

Appl. No.:

11/318709

Inventors:

Steven Y. Yu - Austin TX, US
Michael R. Matthews - Austin TX, US
Gary A. Shreve - Austin TX, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G01R 27/08
G06F 19/00

US Classification:

324693, 702 34, 702 35, 324700

Abstract:

A detection system for monitoring an engineered structure includes an array of sensors disposable in a predetermined pattern on the engineered structure and disposable between a surface of the engineered structure and a protective coating substantially covering the surface. The detection system also includes a data acquisition system in communication with the array of sensors for retrieving data from the sensors. The array of sensors can provide data corresponding to at least one of a degree of cure of the protective coating, a health of the cured protective coating, and a corrosion rate of the engineered structure at each of the sensors.

US Patent:

20030053070, Mar 20, 2003

Filed:

Jun 28, 2002

Appl. No.:

10/185979

Inventors:

Xudong Fan - Austin TX, US
James Brennan - Austin TX, US
Michael Matthews - Austin TX, US
Pranay Sinha - Austin TX, US
Jerome Porque - Austin TX, US

Assignee:

3M Innovative Properties Company

International Classification:

G01B009/02

US Classification:

356/477000

Abstract:

A method for screening the quality of an optical component including the step of simulating the performance of the optical component. The step of simulating includes the step of measuring the optical phase of the optical component, wherein the step of measuring comprises indirectly measuring the optical phase of the optical component using a scanning laser having a scanning step size and a modulation frequency such that /2. The light throughput R of the optical component is then measured. A transfer function H as a function of optical frequency is constructed where H()=R()exp[j ()], and the performance is simulated using the measured value of the optical phase and the light throughput into the transfer function.

US Patent:

20030059195, Mar 27, 2003

Filed:

Aug 29, 2002

Appl. No.:

10/232213

Inventors:

James Brennan - Austin TX, US
Barbara DeBaun - Woodbury MN, US
Barry Koch - Blaine MN, US
Dwayne LaBrake - Cedar Park TX, US
Nicholas Lee - Woodbury MN, US
Michael Matthews - Austin TX, US
Terry Smith - Roseville MN, US
Wayne Varner - Woodbury MN, US

International Classification:

G02B006/00

US Classification:

385/146000, 385/011000

Abstract:

Optical devices using shaped optical fibers and methods for using shaped optical fibers.

US Patent:

20040197042, Oct 7, 2004

Filed:

Apr 4, 2003

Appl. No.:

10/406927

Inventors:

Michael Matthews - Austin TX, US

International Classification:

G02B006/27

US Classification:

385/011000

Abstract:

A device and method in accordance with the present invention align the polarization of an incoming light wave to the principal axis of a polarization maintaining (PM) optical fiber. Light is launched from the broadband source travels through a beam splitter to a polarizer, a polarization control device, a signal transmission medium and a birefringent medium having at least one partially reflective region including a cleaved and polished end face of the fiber or a Bragg grating written into a length of PM fiber. The reflected light is then used to align the polarization of the light to the birefringent axis of the PM fiber.