Patents by Inventor Jin-yi Lee
Jin-yi Lee 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: 11169116Abstract: Disclosed herein are a probe for a nondestructive testing device using a crossed gradient induced current and a method of manufacturing an induction coil for a nondestructive testing device. The probe for a nondestructive testing device using a crossed gradient induced current includes an induction coil formed to have a predetermined width and to generate first and second induced currents in a direction crossing each other when a current is applied from a power supply, and a magnetic sensor part installed adjacent to the induction coil so as to measure the first and second induced currents induced from the induction coil.Type: GrantFiled: November 25, 2019Date of Patent: November 9, 2021Assignee: Industry-Academic Cooperation Foundation, Chosun UniversityInventor: Jin Yi Lee
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Patent number: 10788456Abstract: Disclosed is an eddy current inspection device for nondestructive testing. The device includes: a bobbin-shaped coil configured to be inserted into a specimen, which is an object of nondestructive testing, and to apply induction current to an inner diameter of the specimen; a reference coil configured to be inserted into a nondestructive specimen, which is a reference of the specimen, and to apply induction current to an inner diameter of the nondestructive specimen; a cylindrical manual sensor array configured to disposed in the bobbin-shaped coil and to include lines and rows; and a control module configured to select one or more frequencies of multiple frequencies, apply AC power to the bobbin-shaped coil and the reference coil, generate a square wave signal with a varying phase difference, and perform first multiplication by an applied signal and the square wave signal. Accordingly, it is possible to accurately detect a flaw.Type: GrantFiled: November 28, 2017Date of Patent: September 29, 2020Assignee: Industry-Academic Cooperation Foundation, Chosun UniversityInventors: Jin Yi Lee, Jung Min Kim, Sun Bo Sim
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Publication number: 20200166479Abstract: Disclosed herein are a probe for a nondestructive testing device using a crossed gradient induced current and a method of manufacturing an induction coil for a nondestructive testing device. The probe for a nondestructive testing device using a crossed gradient induced current includes an induction coil formed to have a predetermined width and to generate first and second induced currents in a direction crossing each other when a current is applied from a power supply, and a magnetic sensor part installed adjacent to the induction coil so as to measure the first and second induced currents induced from the induction coil.Type: ApplicationFiled: November 25, 2019Publication date: May 28, 2020Applicant: Industry-Academic Cooperation Foundation, Chosun UniversityInventor: Jin Yi LEE
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Publication number: 20200049661Abstract: Disclosed is an eddy current inspection device for nondestructive testing. The device includes: a bobbin-shaped coil configured to be inserted into a specimen, which is an object of nondestructive testing, and to apply induction current to an inner diameter of the specimen; a reference coil configured to be inserted into a nondestructive specimen, which is a reference of the specimen, and to apply induction current to an inner diameter of the nondestructive specimen; a cylindrical manual sensor array configured to disposed in the bobbin-shaped coil and to include lines and rows; and a control module configured to select one or more frequencies of multiple frequencies, apply AC power to the bobbin-shaped coil and the reference coil, generate a square wave signal with a varying phase difference, and perform first multiplication by an applied signal and the square wave signal. Accordingly, it is possible to accurately detect a flaw.Type: ApplicationFiled: November 28, 2017Publication date: February 13, 2020Applicant: Industry-Academic Cooperation Foundation, Chosun UniversityInventors: Jin Yi LEE, Jung Min KIM, Sun Bo SIM
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Patent number: 10473730Abstract: A defect detection device enables easy removal of magnetic impurities. The defect detection device has a structure capable of effectively removing magnetic impurities adhered to a magnetic flux leakage detection device for nondestructive inspection of a small-diameter heat transfer tube or a partially saturated eddy current detection system. With the defect detection device, it is possible to minimize adhesion of magnetic impurities that deteriorate the performance of a leakage magnetic flux detection device for nondestructive inspection of a small-diameter tube of ferromagnetic metal material or a partially saturated eddy current detection system. Further, there is an advantage in that it is possible to remove the adhered magnetic impurities from the defect detection device easily.Type: GrantFiled: October 18, 2017Date of Patent: November 12, 2019Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITYInventors: Jin Yi Lee, Jung Min Kim, Myung Chul Jung, Ji Su Kim
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Publication number: 20180113177Abstract: A defect detection device enables easy removal of magnetic impurities. The defect detection device has a structure capable of effectively removing magnetic impurities adhered to a magnetic flux leakage detection device for nondestructive inspection of a small-diameter heat transfer tube or a partially saturated eddy current detection system. With the defect detection device, it is possible to minimize adhesion of magnetic impurities that deteriorate the performance of a leakage magnetic flux detection device for nondestructive inspection of a small-diameter tube of ferromagnetic metal material or a partially saturated eddy current detection system. Further, there is an advantage in that it is possible to remove the adhered magnetic impurities from the defect detection device easily.Type: ApplicationFiled: October 18, 2017Publication date: April 26, 2018Inventors: Jin Yi LEE, Jung Min KIM, Myung Chul JUNG, Ji Su KIM
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Patent number: 9279783Abstract: Disclosed herein are an apparatus and a method for detecting a crack. The apparatus includes a power supply unit, a sensor module, and a signal reception module. The power supply unit supplies power. The sensor module receives the input power from the power supply unit, and outputs sensing power corresponding to the magnetic field of an object to be measured. The signal reception unit converts the sensing power output from the sensor module into a quantitative value, and computes the distribution of the magnetic field. The sensor module includes a first sensor array configured to detect magnetic field vectors in a direction vertical to a sensor surface, and a second sensor array placed on the first sensor array in an overlapping manner and configured to detect magnetic field vectors in a direction lateral with respect to the sensor surface.Type: GrantFiled: November 2, 2012Date of Patent: March 8, 2016Assignee: INDUSRTY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITYInventors: Jin Yi Lee, Jong Woo Jun, Jung Min Kim
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Patent number: 9182373Abstract: Disclosed herein are an apparatus and method for detecting a crack in a small-bore piping system. The apparatus includes a sensor unit, a bobbin coil, a power supply unit, and a signal reception unit. The sensor unit is configured such that a plurality of magnetic sensors is arranged thereon and formed to be cylindrical. The bobbin coil is wound around the outside surface of the sensor unit. The power supply unit applies direct current (DC) power to the sensor unit and alternating current (AC) power to the bobbin coil. The signal reception unit quantifies a signal from the sensor unit. The sensor unit detects the distribution of a magnetic-field attributable to the crack in the small-bore piping system based on the AC power applied to the bobbin coil.Type: GrantFiled: November 2, 2012Date of Patent: November 10, 2015Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITYInventors: Jin Yi Lee, Jong Woo Jun, Jung Min Kim
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Patent number: 9170234Abstract: If surface defects, near surface defects, or internal defects of a ferromagnetic substance object, a paramagnetic substance object, or a mixture object of ferromagnetic and paramagnetic substances are not quantitatively analyzed, the detected results can be differently analyzed depending on the knowledge or skill of an inspector. A defect detection apparatus according to an exemplary embodiment of the present invention includes an induced current applier, a magneto-electric converter, a signal processor, a signal converter, and a data processor. The induced current applier applies a line or surface current to an object that is to be measured by using an alternating current (AC) having a frequency varying depending on a depth to be measured. The magneto-electric converter senses a magnetic field generated from the object by the Hn e or surface current and generates a magnetic field sensing signal corresponding to a strength of the sensed magnetic field.Type: GrantFiled: August 7, 2007Date of Patent: October 27, 2015Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, CHOSUN UNIVERSITYInventors: Jin-Yi Lee, Jong-Woo Jun, Ji-Seong Hwang
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Publication number: 20130314082Abstract: Disclosed herein are an apparatus and method for detecting a crack in a small-bore piping system. The apparatus includes a sensor unit, a bobbin coil, a power supply unit, and a signal reception unit. The sensor unit is configured such that a plurality of magnetic sensors is arranged thereon and formed to be cylindrical. The bobbin coil is wound around the outside surface of the sensor unit. The power supply unit applies direct current (DC) power to the sensor unit and alternating current (AC) power to the bobbin coil. The signal reception unit quantifies a signal from the sensor unit. The sensor unit detects the distribution of a magnetic-field attributable to the crack in the small-bore piping system based on the AC power applied to the bobbin coil.Type: ApplicationFiled: November 2, 2012Publication date: November 28, 2013Applicant: INDUSTRY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITYInventors: Jin Yi LEE, Jong Woo JUN, Jung Min KIM
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Publication number: 20130314084Abstract: Disclosed herein are an apparatus and a method for detecting a crack. The apparatus includes a power supply unit, a sensor module, and a signal reception module. The power supply unit supplies power. The sensor module receives the input power from the power supply unit, and outputs sensing power corresponding to the magnetic field of an object to be measured. The signal reception unit converts the sensing power output from the sensor module into a quantitative value, and computes the distribution of the magnetic field. The sensor module includes a first sensor array configured to detect magnetic field vectors in a direction vertical to a sensor surface, and a second sensor array placed on the first sensor array in an overlapping manner and configured to detect magnetic field vectors in a direction lateral with respect to the sensor surface.Type: ApplicationFiled: November 2, 2012Publication date: November 28, 2013Applicant: INDUSTRY-ACADEMIC COOPERATION FOUNDATION CHOSUN UNIVERSITYInventors: Jin Yi LEE, Jong Woo JUN, Jung Min KIM
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Publication number: 20100042336Abstract: If surface defects, near surface defects, or internal defects of a ferromagnetic substance object, a paramagnetic substance object, or a mixture object of ferromagnetic and paramagnetic substances are not quantitatively analyzed, the detected results can be differently analyzed depending on the knowledge or skill of an inspector. A defect detection apparatus according to an exemplary embodiment of the present invention includes an induced current applier, a magneto-electric converter, a signal processor, a signal converter, and a data processor. The induced current applier applies a line or surface current to an object that is to be measured by using an alternating current (AC) having a frequency varying depending on a depth to be measured. The magneto-electric converter senses a magnetic field generated from the object by the Hn e or surface current and generates a magnetic field sensing signal corresponding to a strength of the sensed magnetic field.Type: ApplicationFiled: August 7, 2007Publication date: February 18, 2010Inventors: Jin-Yi Lee, Jong-Woo Jun, Ji-Seong Hwang
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Patent number: 6683452Abstract: A display apparatus of magnetic flux density for detecting an internal crack of a metal or a shape of the metal includes a three-dimensional magnetic flux focusing unit installed near the metal, for concentrating magnetic flux generated by the metal, a magnetic flux density measurement unit installed near the magnetic flux focusing unit, for measuring changes in magnetic flux density concentrated by the magnetic flux focusing unit, and a display unit electrically connected with the magnetic flux measurement unit, for real-time displaying and storing changes in the magnetic flux density.Type: GrantFiled: November 30, 2001Date of Patent: January 27, 2004Assignee: Lacomm Co., Ltd.Inventors: Jin-yi Lee, Won-ha Choi, Min-soo Kim, Dae-jung Kim, Moon-phil Kang
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Publication number: 20020101234Abstract: A display apparatus of magnetic flux density for detecting an internal crack of a metal or a shape of the metal includes a three-dimensional magnetic flux focusing unit installed near the metal, for concentrating magnetic flux generated by the metal, a magnetic flux density measurement unit installed near the magnetic flux focusing unit, for measuring changes in magnetic flux density concentrated by the magnetic flux focusing unit, and a display unit electrically connected with the magnetic flux measurement unit, for real-time displaying and storing changes in the magnetic flux density.Type: ApplicationFiled: November 30, 2001Publication date: August 1, 2002Inventors: Jin-yi Lee, Won-ha Choi, Min-soo Kim, Dae-jung Kim, Moon-phil Kang