Patents by Inventor Andrew David Ellis

Andrew David Ellis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200165934
    Abstract: A method for determining an arrival-time of a rotor blade that includes attaching an RF reader to a stationary surface and an RF tag to the rotor blade. Time-of-flight data points are collected via an RF monitoring process that includes: emitting an RF signal from the RF reader and recording a first time; receiving the RF signal at the RF tag and emitting a return RF signal by the RF tag in response thereto; receiving the return RF signal at the RF reader and recording a second time; and determining the time-of-flight data point as being the duration occurring between the first time and the second time. The RF monitoring process is repeated until multiple time-of-flight data points are collected. A minimum time-of-flight is determined from the multiple time-of-flight data points, and the arrival-time for the rotor blade is determined as being a time that corresponds to the minimum time-of-flight.
    Type: Application
    Filed: November 27, 2018
    Publication date: May 28, 2020
    Applicant: General Electric Company
    Inventors: Kurt Kramer Schleif, Michael Allen Ball, Mario Joseph Arceneaux, Andrew David Ellis, Vincent Carmona
  • Publication number: 20200166432
    Abstract: A method for determining an arrival-time of a rotor blade in a turbine engine that includes the steps of: having an RF reader attached to a stationary surface in the turbine engine; having an RF tag attached to a first region of the rotor blade; having a reference RF tag attached to a rotating structure near the RF tag; in relation to a first revolution of the rotor blade occurring during the operation of the turbine engine, collecting an arrival-time for each of the RF tag and the reference RF tag with the RF reader via an RF monitoring process; comparing the arrival-time of the RF tag to the arrival-time of the reference RF tag to determine an arrival-time test result for the first region of the rotor blade for the first revolution.
    Type: Application
    Filed: November 27, 2018
    Publication date: May 28, 2020
    Applicant: General Electric Company
    Inventors: Kurt Kramer Schleif, Michael Allen Ball, Mario Joseph Arceneaux, Andrew David Ellis, Vincent Carmona
  • Publication number: 20200166431
    Abstract: A method for determining an arrival-time of a rotor blade that includes attaching an RF reader to a stationary surface and an RF tag to the rotor blade. Strength-of-signal data points are collected via an RF monitoring process that includes: emitting an RF signal from the RF reader; receiving the RF signal at the RF tag and emitting a return RF signal by the RF tag in response thereto; receiving the return RF signal at the RF reader; measuring a signal strength of the return RF signal as received by the RF reader; and determining the strength-of-signal data point as being equal to the measured signal strength. The RF monitoring process is repeated until multiple strength-of-signal data points are collected. A maximum strength-of-signal is determined from the multiple strength-of-signal data points, and the arrival-time for the rotor blade is determined as being a time that corresponds to the maximum strength-of-signal.
    Type: Application
    Filed: November 27, 2018
    Publication date: May 28, 2020
    Applicant: General Electric Company
    Inventors: Kurt Kramer Schleif, Michael Allen Ball, Mario Joseph Arceneaux, Andrew David Ellis, Vincent Carmona
  • Patent number: 10641720
    Abstract: The present application thus provides a thermal barrier coating spallation detection system for a gas turbine. The thermal barrier coating spallation detection system may include a hot gas path component with a phosphor layer and a thermal barrier coating, a stimulant radiation source, and an optical device such that the optical device directs stimulant radiation at the thermal barrier coating and receives emission radiation. A change in the received emission radiation indicates spallation of the thermal barrier coating.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: May 5, 2020
    Assignee: General Electric Company
    Inventors: Andrew David Ellis, Kurt Kramer Schleif, Zachary John Snider
  • Publication number: 20190107499
    Abstract: The present application thus provides a thermal barrier coating spallation detection system for a gas turbine. The thermal barrier coating spallation detection system may include a hot gas path component with a phosphor layer and a thermal barrier coating, a stimulant radiation source, and an optical device such that the optical device directs stimulant radiation at the thermal barrier coating and receives emission radiation. A change in the received emission radiation indicates spallation of the thermal barrier coating.
    Type: Application
    Filed: October 6, 2017
    Publication date: April 11, 2019
    Inventors: Andrew David Ellis, Kurt Kramer Schleif, Zachary John Snider
  • Patent number: 10240986
    Abstract: A system includes a thermographic temperature sensor that may measure a temperature of a fluid. The thermographic temperature sensor includes a probe, an optical source coupled to the probe, and a detector coupled to the probe. The system also includes a housing of the probe; and a light pipe of the probe disposed within the housing and including a thermographic phosphor that may phosphoresce in response to absorbing light from the optical source. The phosphorescence by the thermographic phosphor is representative of a temperature of the fluid within a flow path of the fluid, and the detector may detect the phosphorescence by the thermographic phosphor.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: March 26, 2019
    Assignee: General Electric Company
    Inventors: Donald W. Shaw, Andrew David Ellis, David Beshears, Duane Weldon Dinkel, Jason Ryan Henderson, Stephen W. Allison
  • Patent number: 10222274
    Abstract: A thermographic temperature sensor includes a probe having a housing and a light pipe disposed within the housing. The light pipe includes a thermographic phosphor that may phosphoresce in response to absorbing light. The phosphorescence by the thermographic phosphor is representative of a temperature of a fluid in contact with the probe, and a surface area of the light pipe is not in contact with an inner surface of the housing.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: March 5, 2019
    Assignee: General Electric Company
    Inventors: Andrew David Ellis, Donald W. Shaw, David Beshears, Duane Weldon Dinkel, Jason Ryan Henderson, Stephen W. Allison
  • Publication number: 20180087974
    Abstract: A system includes a thermographic temperature sensor that may measure a temperature of a fluid. The thermographic temperature sensor includes a probe, an optical source coupled to the probe, and a detector coupled to the probe. The system also includes a housing of the probe; and a light pipe of the probe disposed within the housing and including a thermographic phosphor that may phosphoresce in response to absorbing light from the optical source. The phosphorescence by the thermographic phosphor is representative of a temperature of the fluid within a flow path of the fluid, and the detector may detect the phosphorescence by the thermographic phosphor.
    Type: Application
    Filed: September 28, 2016
    Publication date: March 29, 2018
    Inventors: Donald W. Shaw, Andrew David Ellis, David Beshears, Duane Weldon Dinkel, Jason Ryan Henderson, Stephen W. Allison
  • Publication number: 20180087975
    Abstract: A thermographic temperature sensor includes a probe having a housing and a light pipe disposed within the housing. The light pipe includes a thermographic phosphor that may phosphoresce in response to absorbing light. The phosphorescence by the thermographic phosphor is representative of a temperature of a fluid in contact with the probe, and a surface area of the light pipe is not in contact with an inner surface of the housing.
    Type: Application
    Filed: September 28, 2016
    Publication date: March 29, 2018
    Inventors: Andrew David Ellis, Donald W. Shaw, David Beshears, Duane Weldon Dinkel, Jason Ryan Henderson, Stephen W. Allison
  • Publication number: 20090074416
    Abstract: A transmitter transmits signals on multiple channels, and they are wavelength multiplexed according to Coherent WDM. Quality of the received signals is very much enhanced by the transmitter tuning the relative phases of neighbouring channels according to delay characteristics of the optical path. In one example, the transmitter adds a relative delay of ΒΌ bit period between each data signal and the beat frequency signal for the odd and even channel groups, to counter the receiver side delays introduced by the AMZI. This corresponds to aligning the transmitter such that the eye crossing corresponds to a minimum of the 80 GHz beat signal. In order to obtain a stable phase relationship between adjacent channels the 80 GHz tone is set to a particular value. Any harmonics or sub-harmonics will similarly vary with phase and therefore can also be used as an error signal for a phase stabilisation circuit.
    Type: Application
    Filed: October 11, 2006
    Publication date: March 19, 2009
    Inventors: Andrew David Ellis, Fatima Gunning, Tadhg Conor Healy
  • Patent number: 6396604
    Abstract: An optical network includes a number of nodes coupled to an optical transmission medium, such as an optical fiber bus. Each of the nodes includes a dark pulse generator. Different nodes output dark pulses in different time slots onto the transmission medium, forming a dark pulse OTDM (optical time division multiplexed) signal. The network may have a re-entrant bus topology.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: May 28, 2002
    Assignee: British Telecommunications plc
    Inventors: Kevin Smith, Julian Kazimierz Lucek, Danny Robert Pitcher, Terrence Widdowson, David Graham Moodie, Andrew David Ellis
  • Patent number: 6215570
    Abstract: Optical signals used for telecommunications in time division multiplexed format are processed to remove channels for local demodulation and to replace the removed channels with locally modulated data. The received signals are subjected to a wavelength modulation so that signals in selected channels are given distinctive wavelengths. After wavelength modulation, the time division multiplexed signals are separated using wavelength sensitive splitters and the various channels are sent to their correct destinations. In one embodiment, one channel is selected and given a distinctive wavelength and all the non-selected channels retain their original wavelength. The channels with the original wavelength are provided to an output terminal for onward transmission whereas the selected channel is provided for local demodulation.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: April 10, 2001
    Assignee: British Telecommunications public limited company
    Inventors: Andrew David Ellis, David Michael Spirit, David Arthur Owen Davies
  • Patent number: 6091524
    Abstract: Optical signals used for telecommunications in time division multiplexed format are processed to remove channels for local demodulation and to replace the removed channels with locally modulated data. The received signals are subjected to a wavelength modulation so that signals in selected channels are given distinctive wavelengths. After wavelength modulation, the time division multiplexed signals are separated using wavelength sensitive splitters and the various channels are sent to their correct destinations. In one embodiment, one channel is selected and given a distinctive wavelength and all the non-selected channels retain their original wavelength. The channels with the original wavelength are provided to an output terminal for onward transmission whereas the selected channel is provided for local demodulation.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: July 18, 2000
    Assignee: British Telecommunications public limited company
    Inventors: Andrew David Ellis, David Michael Spirit, David Arthur Owen Davies
  • Patent number: 5999287
    Abstract: A node for an optical time division multiplexed communication system, and a method of operating such a node, are disclosed. In embodiments of the invention, the node comprises a multiplexer for receiving a plurality of optical signals, and a source of optical radiation, which may be a continuous wave source, or a source of optical pulses. The node is arranged so that the outgoing optical time division multiplexed signal consists only of optical pulses from the source of optical radiation.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: December 7, 1999
    Assignee: British Telecommunications public limited company
    Inventors: David Arthur Owen Davies, Andrew David Ellis
  • Patent number: 5953138
    Abstract: An all-optical processing system coverts or interfaces optical signals from a wavelength division multiplexed (WDM) form to an optical time divisional multiplexed (OTDM) form. The initial WDM signal typically comprises a non-return to zero (NRZ) signalling format. The system includes a plurality of NRZ data modulated, cw optical WDM channels which are cross-phase modulated, and thus are spectrally broadened, in an optical non-linear element, by a strong clock pulse signal. The resultant signal comprises an RZ representation of the original NRZ signal. The RZ signal is temporally shifted by a dispersive element which temporally shifts each wavelength channel by a predetermined amount, to produce a wavelength-interleaved OTDM signal. The signal is then wavelength converted by cross-phase modulation with a cw control beam in a second non-linear optical element to provide a single wavelength OTDM signal.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: September 14, 1999
    Assignee: British Telecommunications public limited company
    Inventor: Andrew David Ellis
  • Patent number: 5724149
    Abstract: A fault signalling system for an optical fiber-based communications link having erbium doped fiber amplifier repeaters comprises a broadband optical source for generating a fault signal in the event of a fault occurring. Each repeater includes such a broadband source, which will output a characteristic fault signal onto the link for transmission to a receiving station, in the event of a fault being detected at that repeater. Advantageously, a control circuit which enables the source to emit its fault signal when appropriate is also used as part of an automatic gain control for the output of the amplifier repeater in normal operation.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: March 3, 1998
    Assignee: British Telecommunications plc
    Inventors: William Andrew Stallard, Andrew David Ellis, Robert Michael Percival