EDWARD B DOWD
Engineering in Madison, CT
License number
Massachusetts 24687
Issued Date
Jun 4, 2015
Type
Engineer in Training
Address
Address
Madison, CT 06443
Professional information
Methods And Apparatus For Forming An Optical Cable Splice
US Patent:
6931194, Aug 16, 2005
Filed:
Dec 8, 2003
Appl. No.:
10/730716
Inventors:
Edward M. Dowd - Madison CT, US
Robert Winiarski - Bristol CT, US
Robert Winiarski - Bristol CT, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B006/00
US Classification:
385135
Abstract:
A method and apparatus for terminating an end of an optical cable is disclosed such that coaxial tubes of the cable and fibers therein are all prevented from moving relative to one another. For some embodiments, the coaxial tubes crimp together by a mechanical crimp that compresses the outer tube onto the inner tube without roller crimping. A fiber retention subassembly crimps to one of the coaxial tubes, and an adhesive fills the fiber retention subassembly, thereby fixing the fibers therein and isolating tension from the ends of the fibers that extend from the fiber retention subassembly. The ends of the fibers of the optical cable connect with fibers of another optical cable or device by a fusion splice. A splice cover holds and/or seals the spliced section and prevents relative movement between the optical cables or the optical cable and the device at the spliced section.
Method For Making Large Diameter Optical Waveguide Having A Bragg Grating And Being Configured For Reducing The Bulk Modulus Of Compressibility Thereof
US Patent:
2007002, Feb 8, 2007
Filed:
Jul 25, 2006
Appl. No.:
11/459854
Inventors:
Edward Dowd - Madison CT, US
Joseph Baraglia - New Britain CT, US
Andrew Kuczma - Clinton CT, US
Brian Pike - Wallingford CT, US
Thomas Engel - East Hampton CT, US
Martin Putnam - Cheshire CT, US
Joseph Baraglia - New Britain CT, US
Andrew Kuczma - Clinton CT, US
Brian Pike - Wallingford CT, US
Thomas Engel - East Hampton CT, US
Martin Putnam - Cheshire CT, US
International Classification:
C03B 37/022, C03B 37/028, C03B 37/027
US Classification:
065393000, 065412000
Abstract:
The present invention provides a method for making a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, two or more inner cores, a cladding surrounding the two or more inner cores, and one or more side holes for reducing the bulk modulus of compressibility and maintaining the anti-buckling strength of the large diameter optical waveguide. The method features the steps of: assembling a preform for drawing a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, by providing an outer tube having a cross-section of at least about 0.3 millimeters and arranging two or more preform elements in relation to the outer tube; heating the preform; and drawing the large diameter optical waveguide from the heated preform. In one embodiment, the method also includes the step of arranging at least one inner tube inside the outer tube.
Multi-Core Strain Compensated Optical Fiber Temperature Sensor
US Patent:
7903908, Mar 8, 2011
Filed:
Mar 31, 2009
Appl. No.:
12/415635
Inventors:
Trevor MacDougall - Simsbury CT, US
Edward Dowd - Madison CT, US
Domino Taverner - Delray Beach FL, US
Edward Dowd - Madison CT, US
Domino Taverner - Delray Beach FL, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B 6/00, G02B 6/34
US Classification:
385 12, 385 24, 385 37, 385126
Abstract:
Methods and apparatus for discrete point temperature sensing include a temperature sensor that can be part of an array of temperature sensors for location in a wellbore. A single unitary ribbon-like structure can form the temperature sensor that has separate optical cores possessing different characteristics such that one core is unique from another core. Each core has a reflective grating disposed therein such that the wavelength of light reflected by the gratings is in response to temperature and any strain applied to the sensor from a surrounding environment. For some embodiments, the responses to strain from each of the gratings are similar while the responses from each of the gratings to temperature are dissimilar due to the different characteristics of the cores. These responses provided separately by each grating therefore enable compensation for strain in order to provide an accurate temperature measurement at the sensor.
Conditioning Optical Fibers For Improved Ionizing Radiation Response
US Patent:
2006024, Nov 9, 2006
Filed:
Apr 6, 2006
Appl. No.:
11/400096
Inventors:
Paul Sanders - Madison CT, US
Trevor MacDougall - Simsbury CT, US
Edward Dowd - Madison CT, US
Andrew Kuczma - Clinton CT, US
Trevor MacDougall - Simsbury CT, US
Edward Dowd - Madison CT, US
Andrew Kuczma - Clinton CT, US
International Classification:
C03B 37/018, C03B 37/01, C03C 25/00
US Classification:
065392000, 065424000, 065426000
Abstract:
Embodiments of the present invention provide various methods to fabricate optical fibers with reduced radiation sensitivity. Optical fibers are treated to one or more secondary or post-processing “conditioning” steps to create and anneal residual defects in the glass for improved radiation insensitivity.
Termination Of Fiber Optic Cable
US Patent:
7805046, Sep 28, 2010
Filed:
Jun 25, 2008
Appl. No.:
12/145592
Inventors:
Edward M. Dowd - Madison CT, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B 6/00, G02B 6/44
US Classification:
385139, 382100
Abstract:
Apparatus and methods provide for cables with secured terminations. For some embodiments, a cable includes an inner tube surrounding an optical fiber, an aluminum tube surrounding the inner tube, and armor tubing surrounding the aluminum tube. The aluminum tube resists collapse of the inner tube at bends in the cable, inhibits or prevents hydrogen from reaching the fiber, and facilitates termination of the cable. For example, terminating the cable may include crimping the armor tubing to deform the aluminum tube into gripping engagement with an outside of the inner tube and an inside of the armor tubing. In some embodiments, a retention assembly secures the fiber relative to the inner tube and includes a retention tube secured to the inner tube and a packing sleeve squeezed into gripping engagement with the fiber by radial inward deformation of the retention tube where the packing sleeve is disposed in the retention tube.
Optical Fiber Coating To Prevent Adhesion At High Temperatures
US Patent:
2011023, Sep 29, 2011
Filed:
Mar 24, 2010
Appl. No.:
12/730841
Inventors:
EDWARD M. DOWD - Madison CT, US
John J. Grunbeck - Northford CT, US
Domino Tavemer - Wallingford CT, US
John J. Grunbeck - Northford CT, US
Domino Tavemer - Wallingford CT, US
International Classification:
G02B 6/44, B23P 25/00, B65B 3/04
US Classification:
385109, 29458, 141 1
Abstract:
Embodiments of the present invention provide methods and apparatus for cables having one or more fibers that may function as a sensing device within a wellbore, wherein the fibers do not adhere to each other or to an inner wall of the cable during a high temperature operation, such as in a thermal recovery operation that may last over 30 days.
Fiber Optic Cable For Use In Harsh Environments
US Patent:
7424190, Sep 9, 2008
Filed:
Apr 4, 2006
Appl. No.:
11/397791
Inventors:
Edward M. Dowd - Madison CT, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B 6/44
US Classification:
385109, 385111, 385113
Abstract:
Fiber optic cables suitable for use in harsh environments such as down hole oil and gas well applications and methods for fabricating the same have been provided. In one embodiment, an optic cable suitable for down hole oil field applications comprises one or more optical fibers disposed in an inner tube and a corrosion resistant metal outer tube disposed over the inner tube, where the inner and outer tubes make intermittent contact. In another embodiment, an optic cable suitable for down hole oil field applications comprise one or more optical fibers disposed in a polymer tube having fins extending therefrom.
Pure Silica Core, High Birefringence, Single Polarization Optical Waveguide
US Patent:
7907807, Mar 15, 2011
Filed:
Oct 14, 2008
Appl. No.:
12/251334
Inventors:
Paul E. Sanders - Madison CT, US
Edward M. Dowd - Madison CT, US
Andrew S. Kuczma - Clinton CT, US
Trevor W. MacDougall - Simsbury CT, US
Brian J. Pike - Wallingford CT, US
Edward M. Dowd - Madison CT, US
Andrew S. Kuczma - Clinton CT, US
Trevor W. MacDougall - Simsbury CT, US
Brian J. Pike - Wallingford CT, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B 6/44
US Classification:
385108, 385102
Abstract:
Methods and apparatus provide for birefringent waveguides suitable for optical systems exhibiting polarization dependence such as interferometer sensors including Sagnac interferometric fiber optic gyroscopes (IFOG). The waveguides, for some embodiments, may offer single polarization performance over lengths of about a kilometer or more due to polarization dependent attenuation. According to some embodiments, the waveguides incorporate a pure silica core for resistance to radiation-induced attenuation (RIA).
Sensing Device Having A Large Diameter D-Shaped Optical Waveguide
US Patent:
2012007, Mar 29, 2012
Filed:
Dec 6, 2011
Appl. No.:
13/311854
Inventors:
Alan D. Kersey - South Glastonbury CT, US
Paul E. Sanders - Madison CT, US
Martin A. Putnam - Cheshire CT, US
Edward Michael Dowd - Madison CT, US
Paul E. Sanders - Madison CT, US
Martin A. Putnam - Cheshire CT, US
Edward Michael Dowd - Madison CT, US
International Classification:
G02B 6/00, B24B 1/00, C03C 15/00, B23P 11/00
US Classification:
385 12, 294261, 451 28, 216 24, 294262
Abstract:
An optical sensor formed from an optical waveguide having at least one core surrounded by a cladding and a large diameter generally D-shaped portion is disclosed. Axial or compressive strain across the D-shaped cross section may be determined by measuring the change in polarization or birefringence of the light output from the sensor. A layer responsive to a parameter may be disposed on a flat portion of the D-shaped portion of the sensor. The refractive index of the layer changes and/or the layer applies a strain on the sensor in response to the parameter. Changes in the refractive index of the layer alters the light output from the sensor, which is measured over time and correlated to the parameter.
Pure Silica Core, High Birefringence, Single Polarization Optical Waveguide
US Patent:
7437044, Oct 14, 2008
Filed:
Dec 21, 2006
Appl. No.:
11/614606
Inventors:
Paul E. Sanders - Madison CT, US
Edward M. Dowd - Madison CT, US
Andrew S. Kuczma - Clinton CT, US
Trevor W. MacDougall - Simsbury CT, US
Brian J. Pike - Wallingford CT, US
Edward M. Dowd - Madison CT, US
Andrew S. Kuczma - Clinton CT, US
Trevor W. MacDougall - Simsbury CT, US
Brian J. Pike - Wallingford CT, US
Assignee:
Weatherford/Lamb, Inc. - Houston TX
International Classification:
G02B 6/24
US Classification:
385126, 385123, 385124, 385125
Abstract:
Methods and apparatus provide for birefringent waveguides suitable for optical systems exhibiting polarization dependence such as interferometer sensors including Sagnac interferometric fiber optic gyroscopes (IFOG). The waveguides, for some embodiments, may offer single polarization performance over lengths of about a kilometer or more due to polarization dependent attenuation. According to some embodiments, the waveguides incorporate a pure silica core for resistance to radiation-induced attenuation (RIA).