Patents by Inventor Jongmook Lim
Jongmook Lim 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).
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Patent number: 11624693Abstract: A system includes a method and apparatus suitable for measuring planar drop sizes in a liquid spray. Measurement may involve illuminating the spray with multiple lasers and measuring the scattered intensities at several view angles using linear arrays. The system may use inverse calculation of the measured scattered intensity to estimate the local drop sizes across the entire plane in a spray. The system includes radiation detectors containing sensing elements, a lens systems, and analog to digital conversion board to convert scattered intensities to drop sizes. In addition, the system may include choppers including at least two unique filters. The filters may be selectively placed in a path between the spray and the sensing elements. By selectively placing a single array may measure both a scattered intensity and an extinction of laser light emitted from the spray.Type: GrantFiled: June 25, 2020Date of Patent: April 11, 2023Assignee: EN'URGA, INC.Inventors: Yudaya R. Sivathanu, Vinoo Narayanan, Jongmook Lim, Jason Green
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Publication number: 20200326268Abstract: A system includes a method and apparatus suitable for measuring planar drop sizes in a liquid spray. Measurement may involve illuminating the spray with multiple lasers and measuring the scattered intensities at several view angles using linear arrays. The system may use inverse calculation of the measured scattered intensity to estimate the local drop sizes across the entire plane in a spray. The system includes radiation detectors containing sensing elements, a lens systems, and analog to digital conversion board to convert scattered intensities to drop sizes. In addition, the system may include choppers including at least two unique filters. The filters may be selectively placed in a path between the spray and the sensing elements. By selectively placing a single array may measure both a scattered intensity and an extinction of laser light emitted from the spray.Type: ApplicationFiled: June 25, 2020Publication date: October 15, 2020Applicant: En'Urga, Inc.Inventors: Yudaya R. Sivathanu, Vinoo Narayanan, Jongmook Lim, Jason Green
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Patent number: 10712251Abstract: A system includes a method and apparatus suitable for measuring planar drop sizes in a liquid spray. Measurement may involve illuminating the spray with multiple lasers and measuring the scattered intensities at several view angles using linear arrays. The system may use inverse calculation of the measured scattered intensity to estimate the local drop sizes across the entire plane in a spray. The system includes radiation detectors containing sensing elements, a lens systems, and analog to digital conversion board to convert scattered intensities to drop sizes. In addition, the system may include choppers including at least two unique filters. The filters may be selectively placed in a path between the spray and the sensing elements. By selectively placing a single array may measure both a scattered intensity and an extinction of laser light emitted from the spray.Type: GrantFiled: January 17, 2018Date of Patent: July 14, 2020Assignee: En'Urga, Inc.Inventors: Yudaya R. Sivathanu, Vinoo Narayanan, Jongmook Lim, Jason Green
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Publication number: 20190283904Abstract: A method of determining a maintenance status of an aircraft engine to be tested. The method includes measuring spectral radiation intensities at a plurality of wavelengths and at a plurality of viewing angles from an exhaust plume of an aircraft engine to be tested so as to provide a plurality of measured spectral radiation intensities. Then, converting the plurality of measured spectral radiation intensities to test planar maps of at least one of: temperature, carbon dioxide concentration, and soot volume fractions. Next, comparing each test planar map to a fiducial map so as to provide a normal distance between the test planar map and the fiducial map. Then, the normal distance is compared to at least one threshold so as to determine a maintenance status of the aircraft engine to be tested. The method reduces the cost and time needed for aircraft maintenance, while increasing safety.Type: ApplicationFiled: March 19, 2019Publication date: September 19, 2019Inventors: Yudaya R. Sivathanu, Jongmook Lim
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Publication number: 20190219491Abstract: A system includes a method and apparatus suitable for measuring planar drop sizes in a liquid spray. Measurement may involve illuminating the spray with multiple lasers and measuring the scattered intensities at several view angles using linear arrays. The system may use inverse calculation of the measured scattered intensity to estimate the local drop sizes across the entire plane in a spray. The system includes radiation detectors containing sensing elements, a lens systems, and analog to digital conversion board to convert scattered intensities to drop sizes. In addition, the system may include choppers including at least two unique filters. The filters may be selectively placed in a path between the spray and the sensing elements. By selectively placing a single array may measure both a scattered intensity and an extinction of laser light emitted from the spray.Type: ApplicationFiled: January 17, 2018Publication date: July 18, 2019Applicant: En'Urga, Inc.Inventors: Yudaya R. Sivathanu, Vinoo Narayanan, Jongmook Lim, Jason Green
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Patent number: 9664567Abstract: A method and apparatus suitable for measuring temperature of a surface of a segment of a rail using a sensor underneath a moving or a stationary rail car. The measurement is based on intensities of infrared radiation emitted by the surface. The method uses relationships among emissivity, radiation intensity and surface temperature without assuming an emissivity value for the surface. The apparatus comprises radiation detectors containing sensing elements, a lens system, and an analog to digital conversion board to convert radiation intensities to temperature.Type: GrantFiled: October 18, 2013Date of Patent: May 30, 2017Inventors: Yudaya Raju Sivathanu, Jongmook Lim, Vinoo Narayanan
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Patent number: 9459216Abstract: Method for detecting variations in gas density within a volume surrounded by a closed metal wall opaque to optical light includes a source of x-rays positioned at a selected location outside the closed metal wall. Positioning a detector outside the closed metal wall at a location suitable to detect x-rays from the source passing entirely through a portion of the volume surrounded by the closed metal wall. Providing the detector with a plurality of sensors arranged in at least one row to capture a dimensionally distributed view of detected x-rays. Coupling a processor to an output of the detector to analyze the data which can be displayed in a suitable graphical or pictorial presentation, including processing the data to correct for any beam hardening of the x-rays as they pass through the closed metal wall, to apply the Maximum Likelihood Estimation method to generate on the display a reconstructed image of the gas density, and to use Inverse Radon Transforms for deconvolution.Type: GrantFiled: March 13, 2013Date of Patent: October 4, 2016Assignee: En'Urga, Inc.Inventors: Yudaya Raju Sivathanu, Jongmook Lim, Ye Mi
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Publication number: 20160089062Abstract: A method and a mobile app are disclosed for obtaining hemoglobin count in the blood of a mammal using digital images of the conjunctiva of the eye of the mammal taken with a camera of a mobile device running the mobile app. The mobile app carries out a method including: obtaining a color image of the conjunctiva of the eye using the digital camera; computing an R/B ratio and a Y/I ratio of the color image; normalizing the R/B ratio and the Y/I ratio using color image normalization parameters obtained using a master camera so as to provide a R/B true ratio and a Y/I true ratio; and using the R/B true ratio and the Y/I true ratio as inputs to respective look-up tables created using the master camera so as to provide an accurate measure of blood hemoglobin count.Type: ApplicationFiled: September 30, 2014Publication date: March 31, 2016Inventors: Yudaya R. Sivathanu, Jongmook Lim
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Publication number: 20150110151Abstract: A method and apparatus suitable for measuring temperature of a surface of a segment of a rail using a sensor underneath a moving or a stationary rail car. The measurement is based on intensities of infrared radiation emitted by the surface. The method uses relationships among emissivity, radiation intensity and surface temperature without assuming an emissivity value for the surface. The apparatus comprises radiation detectors containing sensing elements, a lens systems, and analog to digital conversion board to convert radiation intensities to temperature.Type: ApplicationFiled: October 18, 2013Publication date: April 23, 2015Inventors: Yudaya Sivathanu, Jongmook Lim, Vinoo Narayanan
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Patent number: 8134703Abstract: An apparatus and method for measuring spray angle, spray uniformity, and spray velocity using laser sheet tomography includes measuring the extinction image formed by a spray in two laser sheets spaced apart by a know distance.Type: GrantFiled: March 4, 2010Date of Patent: March 13, 2012Assignee: En'Urga Inc.Inventors: Yudaya R. Sivathanu, Jongmook Lim
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Publication number: 20100225912Abstract: An apparatus and method for measuring spray angle, spray uniformity, and spray velocity using laser sheet tomography includes measuring the extinction image formed by a spray in two laser sheets spaced apart by a know distance.Type: ApplicationFiled: March 4, 2010Publication date: September 9, 2010Applicant: EN'URGA INC.Inventors: Yudaya R. Sivathanu, Jongmook Lim
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Publication number: 20100172471Abstract: Apparatus for detecting variations in gas density within a volume surrounded by a closed metal wall opaque to optical light includes a source of x-rays positioned at a selected location outside the closed metal wall. A detector is positioned outside the closed metal wall at a location suitable to detect x-rays from the source passing entirely through a portion of the volume surrounded by the closed metal wall. The detector has a plurality of sensors arranged in at least one row to capture a dimensionally distributed view of detected x-rays. A processor coupled to an output of the detector analyzes the data which can be displayed in a suitable graphical or pictorial presentation. The closed metal wall can define a housing for a flame, spray or other gaseous distribution. The entirety of the apparatus, excluding the display, can be located with a radiation shield, made of lead or other suitable material to prevent any stray output of x-rays. A dopant can be added to enhance the interaction with the x-rays.Type: ApplicationFiled: September 17, 2009Publication date: July 8, 2010Inventors: Yudaya R. Sivathanu, Jongmook Lim, Ye Mi