Allen L Davis

US Patent:

6782150, Aug 24, 2004

Filed:

Nov 29, 2000

Appl. No.:

09/740760

Inventors:

Allen R. Davis - Falls Church VA
Daniel L. Gysling - Glastonbury CT
Charles R. Winston - Glastonbury CT
John M. Faustino - East Haven CT
Rebecca S. McGuinn - Middlefield CT

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

G02B 600

US Classification:

385 12, 385 13, 7317001, 7317006, 7317011, 7317013, 7317014, 7315251, 7386118, 7386123

Abstract:

An apparatus for non-intrusively sensing fluid flow within a pipe is provided. The apparatus includes a first sensing array for sensing acoustic signals traveling at the speed of sound through fluid flow within the pipe, a second sensing array for sensing local pressure variations traveling with the fluid flow, and a housing attached to the pipe for enclosing the sensing arrays. The first sensing array includes a plurality of first optical pressure sensors and the second sensing array includes a plurality of second optical pressure sensors.

US Patent:

20130087509, Apr 11, 2013

Filed:

Sep 10, 2012

Appl. No.:

13/608568

Inventors:

Allen P. Davis - Laurel MD, US
Ahmet H. Aydilek - University Park MD, US
David M. Ayres - Alexandria VA, US
Carmen Franks - Alexandria VA, US

Assignee:

University of Maryland - College Park MD

International Classification:

E03F 5/14

US Classification:

2107473, 2105001, 21017003, 210435, 210335, 210767, 210791, 294261

Abstract:

A filtration system and method are provided for removing suspended solids and other affiliated pollutants from stormwater runoff and any other contaminated water. The filtration system and method utilize a filter having a geosynthetic material. By improving or replacing a conventional filtration system, such as a sand filtration system, with a geosynthetic material, the removal efficiency of suspended solids and affiliated pollutants is maintained or improved and the lifespan of the filtration system is lengthened due to simpler cleaning processes and a reduced need for material replacements. The filter can be a retrofit filter for fitting to existing storm drains for removing suspended solids and affiliated pollutants.

US Patent:

20210088408, Mar 25, 2021

Filed:

Sep 21, 2020

Appl. No.:

17/027606

Inventors:

- Washington DC, US
Brandon Redding - University Park MD, US
Allen Davis - Falls Church VA, US
Clay Kirkendall - Fairfax VA, US

International Classification:

G01M 11/00
G02B 6/02
G02B 6/028

Abstract:

Methods and apparatuses for quantitatively measuring strain in an optical fiber. An optical source comprising an optical beam generator and a pulse generator receives instructions from a controller and generates a pulsed optical beam in response to those instructions. The pulsed optical beam is directed into an optical fiber to generate a reflected beam from scattering centers within the optical fiber. A detector records a plurality of frames of data generated by the reflected beam, and the controller tracks an evolution of a speckle pattern carried by the reflected beam from the plurality of frames and calculates a strain induced in a section of the optical fiber from the evolution of the speckle pattern.

US Patent:

20200096385, Mar 26, 2020

Filed:

Sep 24, 2019

Appl. No.:

16/580852

Inventors:

- Washington DC, US
Allen Davis - Falls Church VA, US

International Classification:

G01H 9/00

Abstract:

Method and apparatuses for acoustic sensing using an optical fiber are provide. An optical fiber sensor for acoustic sensing includes an optical fiber, a laser, a pump laser pulse generator, a probe laser pulse generator, a controller, and a detector. The pump laser pulse generator is configured to receive a laser beam, from the laser, and generate a pump laser pulse. Similarly, the probe laser pulse generator is configured to receive the laser beam and generate a plurality of probe laser pulses. The controller is constructed to control the pump laser pulse generator and the probe laser pulse generator to inject the pump laser pulse and the plurality of probe laser pulses, respectively, into the optical fiber at specific timings so as to generate a plurality of Brillouin gratings at a predetermined spacing. The detector is configured to receive reflected pump laser pulses from the plurality of Brillouin gratings, respectively, and provide the reflected pump laser pulses to the controller. The duration of the pump laser pulse is greater than a duration of a probe laser pulse.

US Patent:

20160060139, Mar 3, 2016

Filed:

Aug 27, 2015

Appl. No.:

14/837730

Inventors:

Allen P. Davis - Laurel MD, US
Neil A. Weinstein - Silver Spring MD, US
Rufus L. Chaney - Beltsville MD, US

Assignee:

UNIVERSITY OF MARYLAND - College Park MD
LOW IMPACT DEVELOPMENT DESIGN GROUP, LLC - Beltsville MD

International Classification:

C02F 1/28
B01D 39/08
C02F 3/32
B01D 39/06
B01D 39/02

Abstract:

A filtration system and method are provided for removing suspended solids and other affiliated pollutants from stormwater runoff and any other contaminated water. The filtration system and method utilize a filtration medium including steel slag. By improving or replacing a conventional filtration media, such as a sand filtration system, with a filtration medium including steel slag, the removal efficiency of suspended solids and affiliated pollutants is improved and the lifespan of the filtration system is lengthened.