Allen F Davis

US Patent:

6501067, Dec 31, 2002

Filed:

Nov 29, 2000

Appl. No.:

09/726060

Inventors:

Richard T. Jones - Hamden CT
Allen R. Davis - Falls Church VA
John M. Faustino - East Haven CT

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G01J 104

US Classification:

25022714, 25022716, 25022723, 25022725, 73705, 285 13

Abstract:

An apparatus for non-intrusively sensing fluid flow within a pipe is provided. The apparatus includes an array of sensors that include a plurality of optical fiber coils. The array of sensors senses the fluid flow inside the pipe. At least one optical reflective device is disposed between adjacent optical fiber coils. An isolation pad is disposed between each optical reflective device and the pipe.

US Patent:

7110893, Sep 19, 2006

Filed:

Oct 12, 2004

Appl. No.:

10/964044

Inventors:

Douglas H. Loose - Southington CT, US
Allen R. Davis - Falls Church VA, US

Assignee:

CiDRA Corporation - Wallingford CT

International Classification:

G06F 19/00

US Classification:

702 48, 702 45, 702 49, 7386106

Abstract:

Various methods are described which increase the efficiency and accuracy of a signal processor in determining parameters of a fluid using signals output by a spatial array of sensors disposed along a pipe. In one aspect, parameters used for calculating the temporal Fourier transform of the pressure signals, specifically the amount or duration of the data that the windowing function is applied to and the temporal frequency range, are adjusted in response to the determined parameter. In another aspect, an initialization routine estimates flow velocity so the window length and temporal frequency range can be initially set prior to the full array processing. In another aspect, the quality of one or more of the parameters is determined and used to gate the output of the apparatus in the event of low confidence in the measurement and/or no flow conditions. In another aspect, a method for determining a convective ridge of the pressure signals in the k-ω plane is provided.

US Patent:

62788116, Aug 21, 2001

Filed:

Sep 20, 1999

Appl. No.:

9/399504

Inventors:

Arthur D. Hay - Cheshire CT
Alan D. Kersey - South Glastonbury CT
Robert J. Maron - Cromwell CT
Phillip Edmund Pruett - Wallingford CT
Mark R. Fernald - Enfield CT
Guy A. Daigle - Plainville CT
F. Kevin Didden - Wallingford CT
Allen R. Davis - Glastonbury CT
Michael A. Davis - Glastonbury CT
Timothy J. Bailey - Longmeadow MA

International Classification:

G02B 600

US Classification:

385 13

Abstract:

A fiber optic Bragg grating pressure sensor particularly suited for measuring ambient pressure of a fluid includes a pressuring detecting device 12 such as a glass element whose elastic deformation is proportional to applied pressure. An optical fiber 28 with an integral first grating 33 is wrapped at least once around the device and has at least a portion of its length fused to the device 12 such that elastic deformation of the device 12 generates a corresponding axial strain in the fiber 28 and/or the grating 33 and thus a corresponding change of the fiber length and/or characteristic reflectance wavelength of the grating 33. A second grating 35 may be formed near the pressure detecting device 12 so as to sense ambient temperature but not be affected by deformation of the device 12 for temperature compensation. Also, the fiber 28 may have more than one grating or be doped at least between a pair of gratings 160,162, to form a fiber laser or a DFB fiber laser which lasing wavelength changes with changing pressure.