Patents by Inventor Hegeon Kwun

Hegeon Kwun 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).

  • Patent number: 10048225
    Abstract: A method for inspection of tubes in a boiler is disclosed. The method of inspecting includes the steps of providing an apparatus having a sensor and a housing adapted to contain the sensor. The method further including the steps of extending the apparatus into a tube bundle until a desired tube for inspection is reached; rotating the apparatus until the sensor is positioned over the tube to be inspected; clamping the housing around the tube to be inspected, thereby clamping the sensor around the tube; transmitting a pulse of guided waves into the tube to be inspected and detecting reflected signals; and acquiring data from the reflected signals and determining the condition of the tube.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: August 14, 2018
    Assignee: ELECTRIC POWER RESEARCH INSTITUTE, INC.
    Inventors: Hegeon Kwun, Matthew Capps, James Crane, Stanley M. Walker
  • Patent number: 9465011
    Abstract: A sensor for use in magnetostrictive testing of a structure. An array of sensor elements is attached to a flexible backing. Each sensor element has a thin strip made from magnetostrictive material, a first coil wrapped around the width of the strip and operable to provide a DC bias magnetic field, and a second coil wrapped around the width of the strip and operable for MsS generation and detection. Typically, the first coils of all strips are electrically connected to each other and the second coils of all strips are electrically connected to each other, to form two separate coil circuits. The probe may be wrapped around the circumference of a cylindrical structure, and used for magnetostrictive testing.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: October 11, 2016
    Assignee: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Sergey A. Vinogradov, Hegeon Kwun, Darryl L. Wagar
  • Patent number: 9176108
    Abstract: A method and system for detecting corrosion metal loss. One may provide a guided wave probe that includes an electromechanical device and a corrosion probe. This may be followed by measuring a baseline guided wave attenuation value of the corrosion probe with no corrosion. One may then periodically measure the guided wave attenuation of the corrosion probe and detect an increase in guided wave attenuation values and identify metal corrosion associated with the increase in guided wave attenuation values. This may then be followed by estimating the corrosion metal loss of the metallic component.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: November 3, 2015
    Assignee: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Hegeon Kwun, Ronald H. Peterson
  • Patent number: 9170239
    Abstract: A sensor for use in magnetostrictive testing of a structure. The sensor has a thin ferromagnetic strip with a series of parallel crimps across its width. A first wire coil is wrapped around the width of the strip and along its entire length, such that portions of wire that cross the bottom surface of the strip are located inside the crimps, and portions of wire that are wrapped across the top surface of the strip are between the crimps. The sensor further has a second coil wrapped around the length of the strip, or for pipeline applications, around the pipeline.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: October 27, 2015
    Assignee: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Sergey A. Vinogradov, Hegeon Kwun
  • Publication number: 20150285768
    Abstract: A method for inspection of tubes in a boiler is disclosed. The method of inspecting includes the steps of providing an apparatus having a sensor and a housing adapted to contain the sensor. The method further including the steps of extending the apparatus into a tube bundle until a desired tube for inspection is reached; rotating the apparatus until the sensor is positioned over the tube to be inspected; clamping the housing around the tube to be inspected, thereby clamping the sensor around the tube; transmitting a pulse of guided waves into the tube to be inspected and detecting reflected signals; and acquiring data from the reflected signals and determining the condition of the tube.
    Type: Application
    Filed: June 18, 2015
    Publication date: October 8, 2015
    Inventors: Hegeon Kwun, Matthew Capps, James Crane, Stanley M. Walker
  • Patent number: 9146215
    Abstract: An apparatus and method for inspection of tubes in a boiler is disclosed. The apparatus includes a sensor adapted to generate and detect guided-waves and a mechanical device adapted to reach into a tube bundle and clamp the sensor onto an interior tube selected for inspection. The mechanical device includes a housing adapted to contain the sensor and an air cylinder adapted to actuate the housing to allow the housing to clamp onto the interior tube.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: September 29, 2015
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Hegeon Kwun, Matthew Capps, James Crane, Stanley M. Walker
  • Patent number: 8941287
    Abstract: The present disclosure relates to a system for monitoring a structural component. The system may include an electromechanical device to generate guided waves having a measurement surface and a bonding agent disposed on the measurement surface and configured to engage with the surface of the structural component. The system may also include a heating element for heating the measurement surface, the bonding agent, and capable of heating a portion of the structural component surface. In addition, the system may include a clamp for retaining the measurement surface relative to the structural component.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: January 27, 2015
    Assignee: Southwest Research Institute
    Inventors: Sergey A. Vinogradov, Hegeon Kwun, Glenn M. Light
  • Publication number: 20140312888
    Abstract: A sensor for use in magnetostrictive testing of a structure. An array of sensor elements is attached to a flexible backing. Each sensor element has a thin strip made from magnetostrictive material, a first coil wrapped around the width of the strip and operable to provide a DC bias magnetic field, and a second coil wrapped around the width of the strip and operable for MsS generation and detection. Typically, the first coils of all strips are electrically connected to each other and the second coils of all strips are electrically connected to each other, to form two separate coil circuits. The probe may be wrapped around the circumference of a cylindrical structure, and used for magnetostrictive testing.
    Type: Application
    Filed: April 17, 2013
    Publication date: October 23, 2014
    Applicant: Southwest Research Institute
    Inventors: Sergey A. Vinogradov, Hegeon Kwun, Darryl L. Wagar
  • Publication number: 20140253110
    Abstract: A sensor for use in magnetostrictive testing of a structure. The sensor has a thin ferromagnetic strip with a series of parallel crimps across its width. A first wire coil is wrapped around the width of the strip and along its entire length, such that portions of wire that cross the bottom surface of the strip are located inside the crimps, and portions of wire that are wrapped across the top surface of the strip are between the crimps. The sensor further has a second coil wrapped around the length of the strip, or for pipeline applications, around the pipeline.
    Type: Application
    Filed: March 10, 2013
    Publication date: September 11, 2014
    Applicant: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Sergey A. Vinogradov, Hegeon Kwun
  • Publication number: 20140028328
    Abstract: A method and system for detecting corrosion metal loss. One may provide a guided wave probe that includes an electromechanical device and a corrosion probe. This may be followed by measuring a baseline guided wave attenuation value of the corrosion probe with no corrosion. One may then periodically measure the guided wave attenuation of the corrosion probe and detect an increase in guided wave attenuation values and identify metal corrosion associated with the increase in guided wave attenuation values. This may then be followed by estimating the corrosion metal loss of the metallic component.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 30, 2014
    Applicant: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Hegeon KWUN, Ronald H. Peterson
  • Publication number: 20140028154
    Abstract: The present disclosure relates to a system for monitoring a structural component. The system may include an electromechanical device to generate guided waves having a measurement surface and a bonding agent disposed on the measurement surface and configured to engage with the surface of the structural component. The system may also include a heating element for heating the measurement surface, the bonding agent, and capable of heating a portion 100 of the structural component surface. In addition, the system may include a clamp for retaining the measurement surface relative to the structural component.
    Type: Application
    Filed: July 27, 2012
    Publication date: January 30, 2014
    Applicant: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Sergey A. VINOGRADOV, Hegeon KWUN, Glenn M. LIGHT
  • Patent number: 8098065
    Abstract: An economical, flexible, magnetostrictive sensor (MsS) probe assembly for use on longitudinal cylindrical structures, for guided-wave, volumetric inspection of the structures is described. The paired flexible plate MsS probes each include a flexible strip of magnetostrictive material that is positioned and/or adhered to the base of a generally flat, flexible, conductor coil assembly, preferably with an elastomeric adhesive. The conductor coil assembly has a core composed of a thin flexible layer of metal and a thin bendable permanent magnet circuit. The flexible core is surrounded by a flat flexible cable (FFC) that is folded and looped over the layers of the core. The exposed conductors at the ends of the FFC are shifted from each other by one conductor spacing and joined together so that the parallel conductors in the FFC form a flat, flexible, continuous coil.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: January 17, 2012
    Assignee: Southwest Research Institute
    Inventors: Hegeon Kwun, Albert J. Parvin, Jr., Erika Christine Laiche
  • Patent number: 7913562
    Abstract: An economical, flexible, magnetostrictive sensor for use on planar and/or curved structural surfaces, for guided-wave volumetric inspection of the structure. The flexible plate MsS probe includes a flexible strip of magnetostrictive material that is adhered to the base of a flat, flexible, conductor coil assembly. The conductor coil assembly has a core that is composed of a thin flexible strip of metal, a layer of an elastomeric material, and a thin permanent magnet circuit. The flexible core is surrounded by a flat flexible cable (FFC) that is folded and looped over the layers of the core. The exposed conductors at the ends of the FFC are shifted from each other by one conductor and joined so that the parallel conductors in the FFC form a flat, flexible, continuous coil. The entire probe assembly may be bent to match the curved contours of the surface of the structure under investigation.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: March 29, 2011
    Assignee: Southwest Research Institute
    Inventors: Hegeon Kwun, Albert J. Parvin, Ronald H. Peterson
  • Publication number: 20110025317
    Abstract: The present application discloses a magnetostrictive sensor (MsS) probe for guided-wave inspection of the entire length of a fuel rod. The probe includes a waveguide adapted to be clamped to a fuel rod, and an MsS adapted to generate guided waves into the waveguide such that the guided waves propagate down the waveguide into the fuel rod and back to the waveguide for detection by the MsS.
    Type: Application
    Filed: July 29, 2010
    Publication date: February 3, 2011
    Applicant: ELECTRIC POWER RESEARCH INSTITUTE, INC.
    Inventors: Hegeon Kwun, Albert Joseph Parvin, JR., Rolf Glauser
  • Patent number: 7852073
    Abstract: Sensor assemblies and methods are described that facilitate the use of a long-range torsional guided-wave inspection system for inspecting pipes, tubes, or other longitudinal cylindrical structures, with a partial excitation and detection around the pipe circumference. The sensor assemblies comprise a plate-type magnetostrictive sensor probe positioned beneath a compressible/expandable bladder and an inverted U-shaped frame that retain and position the sensor probe against the external wall of the pipe under inspection. Preferably, a magnetostrictive strip is positioned in direct contact with the pipe wall over which the plate magnetostrictive sensor probe is positioned. The probe is preferably curved to match the curvature of the external surface of the pipe. A pad may be positioned between the probe and the magnetostrictive strip to improve compliance with irregular pipe surfaces.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: December 14, 2010
    Assignee: Southwest Research Institute
    Inventors: Hegeon Kwun, Hirotoshi Matsumoto, James F. Crane
  • Publication number: 20100052670
    Abstract: An economical, flexible, magnetostrictive sensor (MsS) probe assembly for use on longitudinal cylindrical structures, for guided-wave, volumetric inspection of the structures is described. The paired flexible plate MsS probes each include a flexible strip of magnetostrictive material that is positioned and/or adhered to the base of a generally flat, flexible, conductor coil assembly, preferably with an elastomeric adhesive. The conductor coil assembly has a core composed of a thin flexible layer of metal and a thin bendable permanent magnet circuit. The flexible core is surrounded by a flat flexible cable (FFC) that is folded and looped over the layers of the core. The exposed conductors at the ends of the FFC are shifted from each other by one conductor spacing and joined together so that the parallel conductors in the FFC form a flat, flexible, continuous coil.
    Type: Application
    Filed: March 25, 2009
    Publication date: March 4, 2010
    Applicant: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Hegeon KWUN, Albert J. PARVIN, JR., Erika Christine LAICHE
  • Publication number: 20100052669
    Abstract: An economical, flexible, magnetostrictive sensor probe for use on planar and/or curved structural surfaces, for guided-wave volumetric inspection of the structure is described. The flexible plate MsS probe includes a flexible strip of magnetostrictive material that is adhered to the base of a generally flat, flexible, conductor coil assembly, preferably with an elastomeric adhesive (such as silicon) or with double sided tape. The conductor coil assembly has a core that is composed of a thin flexible strip of metal, a layer of an elastomeric material (such as rubber), and a thin permanent magnet circuit. The flexible core is surrounded (top, bottom, and on the longitudinal ends) by a flat flexible cable (FFC) that is folded and looped over the layers of the core. The exposed conductors at the ends of the FFC are shifted from each other by one conductor spacing and joined together so that the parallel conductors in the FFC form a flat, flexible, continuous coil.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 4, 2010
    Applicant: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Hegeon Kwun, Albert J. Parvin, Ronald H. Peterson
  • Patent number: 7634392
    Abstract: A method and system for simulating defects in conduits, where the defects are detected using long-range guided-wave inspection techniques. The guided wave interaction with a defect is treated as a one-dimensional problem of plane wave reflection from a boundary of different acoustic impedances. The defect waveform is simulated using an electrical transmission line model and inverse fast Fourier transformation.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: December 15, 2009
    Assignee: Southwest Research Institute
    Inventors: Hegeon Kwun, Sang-Young Kim, Myoung-Seon Choi
  • Patent number: 7610791
    Abstract: Systems and methods are described that carry out an intelligent, variable, time-gain control (TGC) of signal amplification in a long-range, guided-wave inspection and monitoring system. The systems and methods compensate for signal attenuation over the longer distances that guided-wave inspection techniques are capable of operating with. The sensor signal received is divided into relevant frequency bands that are each subjected to a variable TGC through separate variable gain amplifiers (VGAs). The gain selection is processor controlled through the use of a digital look-up table (LUT) stored with predetermined gain functions and/or data that are both time and frequency specific. The signal components are re-combined and digitized for further signal analysis and defect detection. The LUT is established through one or more methods including a weld signal amplitude equalization approach and a background noise equalization approach.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: November 3, 2009
    Assignee: Southwest Research Institute
    Inventors: Hegeon Kwun, Ronald H. Peterson
  • Patent number: 7565252
    Abstract: A method and associated algorithms for identifying and distinguishing geometric feature signals from defect signals in the NDE of longitudinal structures. The method includes the steps of collecting an interrogation signal (including reflected components) from a longitudinal structure under evaluation and comparing it with a selected reference signal from a known geometric feature maintained in a database. The comparison involves a determination of the signals phase. Same phase signals identify the source as a geometric feature, while opposite phase signals identify the source as a defect. The comparison involves the steps of gating each of the signals and creating an array of correlation values between points on each. The correlation values are analyzed and a determination (based on comparing maximum and minimum correlation values) is made of the signal phases. A reliability factor may be determined by comparison of the correlation values and the maximum and minimum thereof.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: July 21, 2009
    Assignee: Southwest Research Institute
    Inventors: Sang Young Kim, Hegeon Kwun