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Signal analysis of a bobbin-type integrated hall sensor array in electromagnetic testing for moisture separator reheater tubes

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INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 2019年第4期59卷 1535-1542页

作者： Le, Minhhuy Kim, Jisoo Kim, Jungmin Lee, Hoyong Lee, Jinyi Chosun Univ Res Ctr IT Based Real Time NDT 309 Pilmun Daero Gwangju 61452 South Korea Gwangju Univ Dept Def Sci & Technol Gwangju South Korea

A moisture separator reheater (MSR) system is installed between the high-pressure and low-pressure steam turbines in a nuclear power plant to increase the heat efficiency of the power plant. Erosion and corrosion of the MSR tubes have threatened the long-term operation of nuclear power plants. Thus a partial saturation eddy current testing (PSECT) method using a bobbin-type integrated hall sensor array (BIHaS) was proposed in our previous study and it showed good results compared with a conventional PSECT. This paper presents a novel signal processing technique to improve detectability and measurability of electromagnetic testing method using a BIHaS through mitigating the inherent vibration signal noise between the BIHaS and ferritic stainless steel tubes.

关键词： hall sensor array partial saturation eddy current testing electromagnetic testing moisture separator reheater

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Nondestructive testing of moisture separator reheater tubing system using hall sensor array

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NONDESTRUCTIVE TESTING AND EVALUATION 2018年第1期33卷 35-44页

作者： Le, Minhhuy Kim, Jungmin Kim, Jisoo Do, Hwa Sik Lee, Jinyi Chosun Univ Res Ctr IT Based Real Time NDT Gwangju South Korea Chosun Univ Dept Control Instrumentat & Robot Engn Gwangju South Korea KEPCO Plant Serv & Engn Co LTD Busan South Korea

This paper presents a nondestructive testing system for inspecting the moisture separator reheater (MSR) tubing system in a nuclear power plant. The technique is based on partial saturation eddy current testing in which a hall sensor array is used to measure the radial component of the electromagnetic field distributed in the tubes. A finned MRS tube of ferritic stainless steel (SS439) with artificial, flat-bottom hole-type defects was used in the experiments. The results show that the proposed system has potential applications in the MSR system or ferromagnetic material tubes in general, which could detect the artificial defects of about 20% of the wall thickness (0.24 mm). Furthermore, the defect volume could be quantitatively evaluated.

关键词： Moisture separator reheater hall sensor array partial saturation eddy current testing nondestructive testing (NDT) corrosion

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Nondestructive Testing of Heat Exchanger Tubes in Balance of Plant using Bobbin Coil and Bobbin-Type Integrated hall sensor array

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MATERIALS EVALUATION 2018年第1期76卷 79-89页

作者： Le, Minhhuy Sim, Sunbo Kim, Jungmin Lee, Jinyi Chosun Univ Res Ctr IT Based Real Time NDT Gwangju South Korea

In this paper, a nondestructive testing system is proposed for inspecting heat exchanger tubes in the balance of plant of a nuclear power plant. A bobbin coil was used to excite an alternating electromagnetic field in heat exchanger tubes, and a bobbin-type integrated hall sensor array (BIHaS) was used to measure the magnetic flux density distribution around discontinuities. The BIHaS was fabricated by arraying 30 hall sensor elements around the circumference of a probe. The system performance was verified by experiments conducted on three 304 stainless steel tubes with artificial circumferential groove, wear scar, axial/circumferential simulated crack, and flat bottom hole discontinuities on the outer diameter surface. The proposed system showed potential for accurate detection and classification of discontinuity types. Furthermore, the discontinuity volume could be estimated.

关键词： heat exchanger tubes hall sensor array nondestructive testing corrosion crack

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Electromagnetic testing of moisture separator reheater tubes using a bobbin-type integrated hall sensor array

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INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 2017年第Sup1期55卷 S203-S209页

作者： Le, Minhhuy Kim, Jungmin Kim, Jisoo Do, Hwa-Sik Lee, Jinyi Chosun Univ Res Ctr IT Based Real Time NDT Gwangju 61452 South Korea Chosun Univ Grad Sch Dept Control & Instrumentat Engn Gwangju 61452 South Korea KEPCO Plant Serv & Engn Co Busan South Korea

This paper presents an electromagnetic testing method for moisture separator reheater (MSR) tubes, which is based on partial saturation eddy current testing (PSECT). The sensor probe has a permanent magnet that is used to partially saturate the MSR tube material, a bobbin coil is used to supply an alternating electromagnetic field that penetrates into the tube, and a bobbin-type integrated hall sensor (BIHaS) array is used to measure the radial component of the electromagnetic field distribution in the tube. The BIHaS has 15 hall sensor elements arrayed at 24 degrees (2.72 mm) intervals on the circumference to make a 13.5 mm diameter sensor probe. Thus, the spatial resolution of measurement can be improved rather than using a single/differential-type sensing coil as used in conventional PSECT systems. The efficiency of PSECT over magnetic flux leakage testing and eddy current testing is presented. Furthermore, the quantitative evaluation of damage volume can be performed.

关键词： hall sensor array partial saturation eddy current testing electromagnetic testing moisture separator reheater

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Calibration of hall sensor array for critical current measurement of YBCO tape with ferromagnetic substrate

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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 2015年 519卷 28-33页

作者： Zhu, Yunpeng Wang, Gang Liu, Liyuan Yang, Xinsheng Zhao, Yong Southwest Jiaotong Univ Key Lab Magnet Levitat Technol & Maglev Trains Superconductor & New Energy R&D Ctr Minist Educ Chengdu 610031 Peoples R China Univ New S Wales Sch Mat Sci & Engn Superconduct Res Grp Sydney NSW 2052 Australia

HAS (hall sensor array) is a powerful tool to detect the uniformity of HTS (high temperature superconductor) tape through mapping the distribution of remanent or shielding field along the surface of the tape. However, measurement of HTS tape with ferromagnetic parts by HSA is still an issue because the ferromagnetic substrate has influence on the magnetic field around the HTS layer. In this work, a continuous HSA system has been designed to measure the critical current of the YBCO tape with ferromagnetic substrate. The relationship between the remanent field and critical current was calibrated by the finite element method. The result showed that the HSA is an effective method for evaluating the critical current of the HTS tape with ferromagnetic substrate. (C) 2015 Elsevier B.V. All rights reserved.

关键词： hall sensor array Ferromagnetic substrate HTS tape

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Non-Destructive Evaluation of Far-Side Corrosion around the Multi-Layered Rivet by using the Solid-State hall sensor array

Non-Destructive Evaluation of Far-Side Corrosion around the ...

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9th IEEE sensors Applications Symposium (SAS)

作者： Kim, Jungmin Le, Minhhuy Lee, Jinyi Chosun Univ Dept Control Instrumentat & Robot Engn Gwangju South Korea Chosun Univ Grad Sch Dept Control & Instrumentat Engn Gwangju South Korea

ISBN: (纸本)9781479921805

Nondestructive testing and evaluation of aircraft are a great importance from the viewpoint of the integrity and flight safety. In aircraft structures, damage is likely to be observed around the rivets that connect the skin to the frames. This paper presents a sensor system which includes a linearly integrated solid-state hall sensor array (LIHaS). The LIHaS has 64 InSb hall sensors arrayed in 0.52 mm of interval respect to 33.28 mm length of measurement. The sensor system was tested on two flat layers of Aluminium alloy for inspecting far-side corrosions having 6 similar to 14 mm of diameter and 0.1 similar to 1.27 mm of depth.

关键词： Aging aircraft Rivet Far-side corrosion Intake hall sensor array NDT

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Detection of Corrosion on Aircraft Structures Using an Electromagnetic Testing sensor and a Spiking Convolutional Neural Network

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IEEE sensorS JOURNAL 2024年第21期24卷 35572-35579页

作者： Minhhuy Le Van Su Luong Phenikaa Univ Fac Elect & Elect Engn Hanoi 12116 Vietnam

The nondestructive testing (NDT) of aircraft intake structures is an important task to ensure the safety and integrity of the aircraft. Corrosion often appears at rivet locations and at the far-side surface or at hidden layers, presenting a challenge for NDT methods. To tackle this issue, we present a spiking NDT system that includes an electromagnetic testing probe with a spiking convolutional neural network (SCNN). The magnetic image of the rivet and corrosion is captured by a high spatial resolution hall sensor array while scanning on the surface of the intake's structure. The SCNN model is developed to analyze the obtained magnetic image and detect the presence of corrosion. The SCNN model, inspired by the principles of biological neurons, utilizes discrete and asynchronous spikes, resulting in remarkable energy efficiency. Our proposed SCNN model demonstrates a remarkable detection accuracy of approximately 93.67%, surpassing the performance of both the prior support vector machine (SVM) model (89.48%) and a conventional convolutional neural network (CNN) model (92.86%) on the same dataset. Importantly, when evaluated on the mu Brain chip, our SCNN model exhibits power consumption approximately four orders of magnitude lower than that of a conventional CNN model running on an edge device (Jetson Nano). This substantial reduction in power consumption underscores the practicality and efficiency of our approach for concealed corrosion detection within aircraft intake structures, holding promises for enhanced maintenance practices in the aviation industry.

关键词： Electromagnetic testing far-side corrosion hall sensor array spiking neural network (SNN)

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An Advanced hall Element array-Based Device for High-Resolution Magnetic Field Mapping

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sensorS 2024年第12期24卷 3773页

作者： Zhou, Tan Cai, Jiangwei Zhu, Xin Soochow Univ Sch Optoelect Sci & Engn Suzhou 215000 Peoples R China Suzhou Matrix Semicond Ltd Suzhou 215000 Peoples R China

The precise mapping of magnetic fields emitted by various objects holds critical importance in the fabrication of industrial products. To meet this requirement, this study introduces an advanced magnetic detection device boasting high spatial resolution. The device's sensor, an array comprising 256 unpackaged gallium arsenide (GaAs) hall elements arranged in a 16 x 16 matrix, spans an effective area of 19.2 mm x 19.2 mm. The design maintains a 1.2 mm separation between adjacent elements. For enhanced resolution, the probe scans the sample via a motorized rail system capable of executing specialized movement patterns. A support structure incorporated into the probe minimizes the measurement distance to below 0.5 mm, thereby amplifying the magnetic signal and mitigating errors from nonparallel probe-sample alignment. The accompanying interactive software utilizes cubic spline interpolation to transform magnetic readings into detailed two- and three-dimensional magnetic field distribution maps, signifying field strength and polarity through variations in color intensity and amplitude sign. The device's efficacy in accurately mapping surface magnetic field distributions of magnetic and magnetized materials was corroborated through tests on three distinct samples: a neodymium-iron-boron magnet, the circular magnetic array from a smartphone, and a magnetized 430 steel plate. These tests, focused on imaging quality and magnetic field characterization, underscore the device's proficiency in nondestructive magnetic field analysis.

关键词： hall sensor array magnetic camera nondestructive testing signal processing

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Three-dimensional Interval Identification of Permanent Magnet Spherical Motor Based on Improved Deep Neural Network

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2023年第1期19卷 419-431页

作者： Zhao, Shidong Che, Yanbo Li, Hongfeng Tianjin Univ Sch Elect & Informat Engn Tianjin Peoples R China

The accurate identification of rotor position is a prerequisite for the closed-loop control of spherical motors. In this paper, the spherical interval of the rotor of the permanent magnet spherical motor was partitioned by the Quaternary Triangular Mesh (QTM). According to different levels of division, the sphere was partitioned by triangles of different sizes. After the partition, a hall sensor was placed at the vertex of the spherical triangle obtained by the level 3 partition. After the rotor starts rotating, the triangular intervals where the rotor poles were located could be identified according to the output of the sensor array. To achieve more precise identification of spherical intervals, the paper proposes a strategy that combines Deep Neural Networks (DNN) with rotor spherical interval identification. However, due to the small change rate of the magnetic field near the rotor pole, it was easy to get the local optimal solution by the neural network algorithm. To solve this problem, the parameters of DNN were optimized by the Krill Herd (KH) algorithm. Through 50 simulations, the classification accuracy of KH-DNN reached 97.7%, and the average Mean Squared Error (MSE) value was 0.0165, which was better than the original DNN algorithm and the control group algorithm. Finally, the algorithm was verified by a rotation experiment. The R-2 value of the trajectory remained above 0.99, and high classification accuracy was guaranteed. The algorithm proposed in the paper provided a new research idea for the position identification of spherical motors.

关键词： Permanent magnet spherical motor Three-dimensional interval identification Deep Neural Network hall sensor array Krill Herd algorithm

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Development of Electromagnetic Cylinder-Type Probe for Inspection of Heat Exchanger Tubes

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IEEE TRANSACTIONS ON MAGNETICS 2022年第3期58卷 1-9页

作者： Minhhuy Le Hong Ha Thi Vu Wang, Dabin Lee, Jinyi Phenikaa Univ Fac Elect & Elect Engn Hanoi 12116 Vietnam Phenikaa Univ Fac Biotechnol Chem & Environm Engn Hanoi 12116 Vietnam Chosun Univ Dept Control & Instrumentat Engn Grad Sch Gwangju 61452 South Korea Chosun Univ Dept Elect Engn Gwangju 61452 South Korea Chosun Univ Interdisciplinary Program IT Bio Convergence Syst Gwangju 61452 South Korea

This article presents a cylinder-type magnetic camera (CMC) system in nondestructive testing (NDT) of a heat exchanger (HX) tube. The CMC system is developed for the inspection of corrosion on HX tubes of nuclear power plants. The CMC probe works based on the principle of eddy current testing, in which a single-large bobbin coil is used to supply eddy current on the tube, and a matrix array of InSb hall sensor is used to measure the electromagnetic field around the corrosion. The CMC system can measure both the real and imaginary components of the magnetic field. The CMC system can operate in two modes: single-line scan mode by selecting a single-line hall sensor or area scan mode by the electrical scan. The limitations and advantages of each operation mode will be presented. The CMC system has the potential for further applications such as evaluating corrosion size, shape, and locations.

关键词： Electron tubes Probes Magnetic field measurement Corrosion Magnetic fields sensors Vibrations Defect hall sensor array heat exchanger (HX) tube nondestructive testing (NDT)

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