Patents by Inventor Seetha RAGHAVAN

Seetha RAGHAVAN 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: 20240042685
    Abstract: A method can include additively manufacturing a sensor structure using a regolith of a celestial body. A sensor can be formed of additively manufactured celestial body regolith. A system for additively manufacturing sensors from celestial body regolith can include a spectrometer configured to receive and analyze regolith to produce regolith data, and an additive manufacturing machine associated with the spectrometer to receive the regolith data and to manufacture a sensor based on the regolith data to perform a predetermined sensor function.
    Type: Application
    Filed: August 2, 2023
    Publication date: February 8, 2024
    Applicant: University of Central Florida Research Foundation, Inc.
    Inventors: Perla Latorre, Seetha Raghavan, Quentin Fouliard
  • Patent number: 11718917
    Abstract: A phosphor thermometry device includes a laser that generates a laser pulse onto a thermal barrier coating (TBC) applied onto a substrate. A metallic bond coat layer is on the substrate. A ceramic top coat layer is on the bond coat layer and includes an undoped layer and a doped sensing layer having co-doped first and second rare-earth luminescent dopants that emit respective first and second different emission wavelengths upon excitation by the laser pulse. A detector receives reflected, convoluted luminescence signals from the TBC. First and second photomultiplier devices detect respective first and second different emission wavelengths of the convoluted luminescence signals. A controller receives and processes signals generated from respective first and second photomultiplier devices and determines luminescence lifetime decay and intensity variations for each of the respective first and second rare-earth luminescent dopants for temperature monitoring of the TBC.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: August 8, 2023
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Quentin Fouliard, Ranajay Ghosh, Seetha Raghavan
  • Patent number: 11680323
    Abstract: A thermal barrier coated component, such as a turbine blade formed from a superalloy substrate, includes a thermal barrier coating applied onto the substrate. A metallic bond coat layer is on the substrate and includes rare-earth luminescent dopants. A ceramic top coat layer is on the bond coat layer. A temperature sensing thermally grown oxide (TGO) layer is formed at the interface of the bond coat layer and ceramic top coat layer. The temperature sensing TGO layer includes grown rare-earth luminescent ions migrated from the metallic bond coat layer in an amount sufficient to enable luminescence sensing of the TGO layer for real-time phosphor thermometry temperature measurements at the TGO layer.
    Type: Grant
    Filed: February 4, 2022
    Date of Patent: June 20, 2023
    Assignee: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Quentin Fouliard, Ranajay Ghosh, Seetha Raghavan
  • Publication number: 20230175139
    Abstract: A phosphor thermometry device includes a laser that generates a laser pulse onto a thermal barrier coating (TBC) applied onto a substrate. A metallic bond coat layer is on the substrate. A ceramic top coat layer is on the bond coat layer and includes an undoped layer and a doped sensing layer having co-doped first and second rare-earth luminescent dopants that emit respective first and second different emission wavelengths upon excitation by the laser pulse. A detector receives reflected, convoluted luminescence signals from the TBC. First and second photomultiplier devices detect respective first and second different emission wavelengths of the convoluted luminescence signals. A controller receives and processes signals generated from respective first and second photomultiplier devices and determines luminescence lifetime decay and intensity variations for each of the respective first and second rare-earth luminescent dopants for temperature monitoring of the TBC.
    Type: Application
    Filed: September 28, 2020
    Publication date: June 8, 2023
    Inventors: Quentin Fouliard, Ranajay Ghosh, Seetha Raghavan
  • Patent number: 11346006
    Abstract: A thermal barrier coated component, such as a turbine blade formed from a superalloy substrate, includes a thermal barrier coating applied onto the substrate. A metallic bond coat layer is on the substrate and includes rare-earth luminescent dopants. A ceramic top coat layer is on the bond coat layer. A temperature sensing thermally grown oxide (TGO) layer is formed at the interface of the bond coat layer and ceramic top coat layer. The temperature sensing TGO layer includes grown rare-earth luminescent ions migrated from the metallic bond coat layer in an amount sufficient to enable luminescence sensing of the TGO layer for real-time phosphor thermometry temperature measurements at the TGO layer.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: May 31, 2022
    Assignee: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Quentin Fouliard, Ranajay Ghosh, Seetha Raghavan
  • Publication number: 20220154348
    Abstract: A thermal barrier coated component, such as a turbine blade formed from a superalloy substrate, includes a thermal barrier coating applied onto the substrate. A metallic bond coat layer is on the substrate and includes rare-earth luminescent dopants. A ceramic top coat layer is on the bond coat layer. A temperature sensing thermally grown oxide (TGO) layer is formed at the interface of the bond coat layer and ceramic top coat layer. The temperature sensing TGO layer includes grown rare-earth luminescent ions migrated from the metallic bond coat layer in an amount sufficient to enable luminescence sensing of the TGO layer for real-time phosphor thermometry temperature measurements at the TGO layer.
    Type: Application
    Filed: February 4, 2022
    Publication date: May 19, 2022
    Inventors: QUENTIN FOULIARD, RANAJAY GHOSH, SEETHA RAGHAVAN
  • Publication number: 20210180191
    Abstract: A thermal barrier coated component, such as a turbine blade formed from a superalloy substrate, includes a thermal barrier coating applied onto the substrate. A metallic bond coat layer is on the substrate and includes rare-earth luminescent dopants. A ceramic top coat layer is on the bond coat layer. A temperature sensing thermally grown oxide (TGO) layer is formed at the interface of the bond coat layer and ceramic top coat layer. The temperature sensing TGO layer includes grown rare-earth luminescent ions migrated from the metallic bond coat layer in an amount sufficient to enable luminescence sensing of the TGO layer for real-time phosphor thermometry temperature measurements at the TGO layer.
    Type: Application
    Filed: September 28, 2020
    Publication date: June 17, 2021
    Inventors: Quentin FOULIARD, Ranajay Ghosh, Seetha Raghavan
  • Patent number: 10837918
    Abstract: The present invention provides a non-destructive method of characterizing CMAS infiltration and CMAS assisted damage in thermal barrier coatings (TBCs). Such approach is especially relevant for determining the lifetime of coatings on e.g. turbines or parts of the turbines such as blades or in-liners of the combustion chambers. The turbines can be gas turbines or high-pressure turbines or others and may be stationary or used for example in aviation.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: November 17, 2020
    Assignees: Deutsches Zentrum für Luft-und Raumfahrt e.V, University of Central Florida Research Foundation, Inc.
    Inventors: Ravisankar Naraparaju, Uwe Schulz, Seetha Raghavan, Estefania Bohorquez
  • Publication number: 20190293567
    Abstract: The present invention provides a non-destructive method of characterizing CMAS infiltration and CMAS assisted damage in thermal barrier coatings (TBCs). Such approach is especially relevant for determining the lifetime of coatings on e.g. turbines or parts of the turbines such as blades or in-liners of the combustion chambers. The turbines can be gas turbines or high-pressure turbines or others and may be stationary or used for example in aviation.
    Type: Application
    Filed: March 23, 2018
    Publication date: September 26, 2019
    Inventors: Ravisankar NARAPARAJU, Uwe SCHULZ, Seetha RAGHAVAN, Estefania BOHORQUEZ