Ralph E Patterson

US Patent:

7280218, Oct 9, 2007

Filed:

Jan 6, 2005

Appl. No.:

11/030248

Inventors:

Robert A. Mitchell - Woodland Hills CA, US
Christine E. Geosling - Calabasas CA, US
Ralph A. Patterson - Moorpark CA, US

Assignee:

Litton Systems Inc. - Woodland Hills CA

International Classification:

G01C 19/66

US Classification:

356459, 372 94

Abstract:

An apparatus and method is provided for facilitating ionization of a gas medium of a laser gyroscope. The apparatus and method employ a solid state light emitting device as a start aid for the laser gyroscope. The solid state light emitting device has a wavelength at or below a threshold wavelength based on a work function of a cathode coating material to prompt ionization of a gas medium within the laser gyroscope.

US Patent:

58568670, Jan 5, 1999

Filed:

Jul 28, 1997

Appl. No.:

8/901504

Inventors:

John P. Rahn - West Hills CA
Ralph A. Patterson - MoorPark CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01N 2100

US Classification:

356 731

Abstract:

The invention is a method and apparatus for quantitatively characterizing the pressure-induced nonreciprocity of a fiber-optic coil where the pressure-induced nonreciprocity is a property of a fiber-optic coil which pertains to the degree to which light beams, initially in phase, differ in phase as a result of traversing the fiber-optic coil in reverse directions while the fiber-optic coil is being subjected to a time-varying pressure. The method comprises the steps of applying time-varying pressure to the fiber-optic coil for a predetermined time period, measuring the phase difference of light beams traversing the fiber-optic coil in reverse directions during the predetermined time period, and obtaining a measure of the nonreciprocity of the fiber-optic coil utilizing the measured phase difference. If the time-varying pressure is specified by a first function of time, the measure of the nonreciprocity is the integral over the predetermined time period of the product of a second function of time and either (1) the phase difference of light beams traversing the fiber-optic coil in reverse directions during the predetermined time period or (2) the integral over time of the phase difference. The second function is chosen such that the measure of the nonrecipocity has a signal-to-noise ratio of at least one.

US Patent:

53373332, Aug 9, 1994

Filed:

Nov 10, 1992

Appl. No.:

7/973878

Inventors:

Thomas P. Daly - Livermore CA
Edward I. Moses - Livermore CA
Ralph W. Patterson - Livermore CA
Richard H. Sawicki - Danville CA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

H01S 3083

US Classification:

372 94

Abstract:

A method for formatting a laser beam pulse (20) using one or more delay loops (10). The delay loops (10) have a partially reflective beam splitter (12) and a plurality of highly reflective mirrors (14) arranged such that the laser beam pulse (20) enters into the delay loop (10) through the beam splitter (12) and circulates therein along a delay loop length (24) defined by the mirrors (14). As the laser beam pulse (20) circulates within the delay loop (10) a portion thereof is emitted upon each completed circuit when the laser beam pulse (20) strikes the beam splitter (12). The laser beam pulse (20) is thereby formatted into a plurality of sub-pulses (50, 52, 54 and 56). The delay loops (10) are used in combination to produce complex waveforms by combining the sub-pulses (50, 52, 54 and 56) using additive waveform synthesis.

US Patent:

57423903, Apr 21, 1998

Filed:

Nov 19, 1996

Appl. No.:

8/751984

Inventors:

Amado Cordova - West Hills CA
Robert J. Hoover - Newbury Park CA
Thomas McLean - Woodland Hills CA
Ralph A. Patterson - Moorpark CA
John P. Rahn - West Hills CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01C 1964

US Classification:

356350

Abstract:

A potted sensor coil for a fiber optic gyroscope includes an inter-layer stress relief layer of lubricating material. The coil is wound into a known pattern. Various coil configurations can be realized in which a coating layer of lubricant relieves stressing at the interface between the outer jacket of the fiber and the coil potting material.

US Patent:

41997379, Apr 22, 1980

Filed:

Oct 18, 1978

Appl. No.:

5/952432

Inventors:

Ralph W. Patterson - Cupertino CA
Terence W. O'Keeffe - Churchill Boro PA
John D. Adam - Murrysville Boro PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H03H 926
H03H 934
H03H 930
H01P 308

US Classification:

333154

Abstract:

A magnetostatic wave device for microwave signal processing which includes an input or output transducer finger arrangement which allows shaping of the device response. Two sets of interdigitated fingers are connected to receive the same microwave input signal which is power divided between the two sets. The fingers of one set are substantially parallel to, and in side-by-side relationship with, the fingers of the other set. The device may be used for delay lines, filters, signal correlation, oscillators and numerous other microwave signal processing arrangements.

US Patent:

60409088, Mar 21, 2000

Filed:

Jul 28, 1998

Appl. No.:

9/123626

Inventors:

John P. Rahn - West Hills CA
Ralph A. Patterson - Moorpark CA
Amado Cordova - Woodland Hills CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01C 1972

US Classification:

356350

Abstract:

A method and apparatus for reducing the temperature-dependent Shupe bias of a potted gyro sensor coil pack to near-zero is provided by selectively adjusting the manner in which CCW and CW fiber leads are attached to the coil pack or the coil mount. The invention recognizes the inevitable existence of a strain differential between the CW and CCW-wound portions of a symmetrically-wound fiber coil. Leads affixed to the ends of the CW and CCW-wound halves of the coil are selectively bonded in accordance with principles for creating a counteracting temperature-dependent stress differential whereby temperature-dependent Shupe bias is substantially eliminated from the gyro output.

US Patent:

61482722, Nov 14, 2000

Filed:

Jan 28, 1999

Appl. No.:

9/238297

Inventors:

Paul M. Bergstrom - Livermore CA
Thomas P. Daly - Livermore CA
Edward I. Moses - Livermore CA
Ralph W. Patterson - Livermore CA
Alexis E. Schach von Wittenau - Livermore CA
Dewey N. Garrett - Livermore CA
Ronald K. House - Tracy CA
Lawrence J. Cox - Los Alamos NM
Donald H. Fujino - San Leandro CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

A61N 510

US Classification:

702179

Abstract:

A system and method is disclosed for radiation dose calculation within sub-volumes of a particle transport grid. In a first step of the method voxel volumes enclosing a first portion of the target mass are received. A second step in the method defines dosel volumes which enclose a second portion of the target mass and overlap the first portion. A third step in the method calculates common volumes between the dosel volumes and the voxel volumes. A fourth step in the method identifies locations in the target mass of energy deposits. And, a fifth step in the method calculates radiation doses received by the target mass within the dosel volumes. A common volume calculation module inputs voxel volumes enclosing a first portion of the target mass, inputs voxel mass densities corresponding to a density of the target mass within each of the voxel volumes, defines dosel volumes which enclose a second portion of the target mass and overlap the first portion, and calculates common volumes between the dosel volumes and the voxel volumes. A dosel mass module, multiplies the common volumes by corresponding voxel mass densities to obtain incremental dosel masses, and adds the incremental dosel masses corresponding to the dosel volumes to obtain dosel masses. A radiation transport module identifies locations in the target mass of energy deposits.

US Patent:

57612250, Jun 2, 1998

Filed:

May 23, 1996

Appl. No.:

8/652770

Inventors:

Bernard C. Fidric - Woodland Hills CA
Ronald James Michal - Wrightwood CA
James Ross Steele - Northridge CA
Eric Lee Goldner - Valencia CA
Ralph A. Patterson - Moorpark CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

H01S 330

US Classification:

372 6

Abstract:

A power boosted source of broadband optical power comprising a broadband light source, optical fiber amplifier and a relative intensity noise reduction system. The optical fiber amplifier amplifies the power level of the optical input signal to provide a power boosted source of broadband optical power out of an output port. A coupler samples a portion of the broadband optical power out of the output port as a sample portion signal. A detector and transimpedance amplifier detect the optical signal and provide a buffered signal having an instantaneous amplitude that faithfully characterizes the intensity of the sample portion signal. A bandpass amplifier amplifies the buffered signal and provides an output control signal to a light source responsive to a composite bias and control current for providing an output optical signal. The output optical signal is coupled to the input of the optical fiber amplifier to be the optical input signal to the optical fiber amplifier. The output optical signal from the ELED has a substantially constant output intensity level and smooth and bell shaped broad band spectrum with a center optical wavelength within the gain bandwidth of the optical fiber amplifier.