第2回
電磁現象を用いた片状黒鉛鋳鉄の黒鉛形態の推定
著者:
野崎 俊彦,Toshihiko NOZAKI,佐藤 武志,Takeshi SATO,阿部 利彦,Toshihiko ABE,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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This paper discusses the feasibility of characterization of graphite morphology in gray cast irons based on electromagnetic method. For the pur pose, gray cast iron with different graphite morphology was systematically evaluated. In order to discuss electromagnetic property of gray cast iron with different graphite morphology, conductivity and permeability were measured. It was found that both conductivity and permeability mai nly depend on graphite morphology. It was shown that the graphite morphology of ...
英字タイトル:
Characterization of graphite morphology of gray cast irons using electromagnetic method
第14回
電磁超音波を用いた減肉モニタリングシステムの 福島第一原子力発電所4号機使用済燃料プール冷却配管への適用
著者:
高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO,浦山 良一,Ryoichi URAYAMA,鈴木 聡則,Akinori SUZUKI
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In the decommissioning measures of Fukushima Daiichi Nuclear Power plant (1F), it is important to ensure the thermal stability of the reactor and the whole system by the cooling system in order to prevent criticality of fuel and fuel debris. However, wall thinning is concerned due to the corrosion in the piping of the cooling system. In order to maintain the safety of the system, it is necessary to manage the piping thinning. In this study, the EMAT thickness monitoring system, which can measure thickne...
英字タイトル:
Application of monitoring system using electromagnetic acoustic transducers for wall thickness measurement to Fukushima Daiichi nuclear power plant Unit 4 spent fuel pool cooling piping
第3回
電磁超音波・渦電流複合センサの開発とその有効性の検証
著者:
鈴木 研一郎,Kenichiro SUZUKI,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,佐藤 武志,Takeshi SATO,Philippe Guy,Amelie Casse
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In this study, we propose a novel EMAT-ECT multi sensor aiming at advanced structural health monitoring. For the purpose, proto-type EMAT-ECT multi-sensor was developed and their functions both as ECT and EMAT prove were evaluated. Experimental results of pulse ECT using the EMAT-ECT multi-sensor showed that the pr oposed sensor has a capability of detection and sizing of flaws. Experimental results of EMAT evaluation using the EMAT-ECT multi-sensor showed that ultrasoni c wave was transmitted by EMAT-ECT ...
英字タイトル:
Development of novel EMAT-ECT multi-sensor and verification of its feasibility
論文
電磁超音波共鳴法による配管減肉のオンラインモニタリング
著者:
浦山 良一,Ryoichi URAYAMA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,兼本 茂,Shigeru KANEMOTO
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The electromagnetic acoustic resonance (EMAR) method provides accurate and stable evaluation in high temperature environment, and it is an effective tool for online monitoring. In this study, the EMAR method and the superposition of the nth compression (SNC) for data processing are applied to online monitoring of pipe wall thinning, and the accuracy and reliability of the measurements are demonstrated through field tests using a large-scale corrosion test loop at high temperature. To measure the thic...
英字タイトル:
Online Monitoring of Pipe Wall Thinning with Electromagnetic Acoustic Resonance Method
第7回
電磁超音波共鳴法による配管減肉の計測と評価
著者:
兼本 茂,Shigeru KANEMOTO,浦山 良一,Ryo-ichi URAYAMA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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Electromagnetic acoustic transducer (EMAT) provides non-contacting measurements and is often applied to monitoring in gh temperature environment. One of drawbacks of EMAT is its low sensitivity and S/N ratio. One way to overcome the uwback is to introduce an Electromagnetic acoustic resonance meth od (EMAR); it has a high capability of evaluating ckness or ultrasonic velocity, and it is applied to the measurement of thickness, elastic constants, damping propertiesso on. Since the principle of the method is...
英字タイトル:
Measurement and Evaluation of Pipe Wall Thinning by Electromagnetic Acoustic Resonance
第9回
電磁超音波共鳴法を用いた配管検査技術の実施適用性の検討
著者:
浦山 良一,Ryoichi URAYAMA,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO,兼本 茂,Shigeru KANEMOTO,大平 拓,Taku OHIRA,菊池 貴好,Takayoshi KIKUCHI
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Abstract The electromagnetic acoustic resonance (EMAR) method provides accurate and stable evaluation and its capability has been demonstrated through online monitoring using a large-scale corrosion test loop in oper ation at high temperature. This study applies EMAR with the signal processing method of the superposition of n'“ compression to the thickness evaluation of piping in a nuclear power plant during shutdown. Sections of piping evaluated by EMAR include those having long-term service, where thinni...
英字タイトル:
Implementation applicability of piping inspection using electromagneticacoustic resonance
第11回
電磁超音波共鳴法を用いた配管減肉検査における底面形状の影響
著者:
浦山 良一,Ryoichi URAYAMA,ジョン マンチョル,Jeong Man Chul,原 翔一郎,Syoichiro HARA,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO,丹治 和宏,Kazuhiro TANJI
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Electromagnetic acoustic transducer (EMAT) provides non-contacting measurements and is often applied to monitoring in high temperature environment. Electromagnetic acoustic resonance method (EMAR) is transmits an ultrasonic burst wave, and the driving frequency of bust wave is swept. Then signal amplitude of each frequency is computed by the superheterodyne processing at the interval. Pulse-EMAR method is transmits an ultrasonic pulse wave propagating, but the pulse wave is not swept. Then echo waves recei...
英字タイトル:
Influence of bottom shape in the pipe wall thinning inspection using an electromagnetic acoustic resonance method
第6回
電磁非破壊評価法を用いたNi 基合金の鋭敏化評価
著者:
及川 諒太,Ryota OIKAWA,内一 哲哉,Tetsuya UCHIMOTO
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It is well known that alloy 600, one of Ni base alloys, is paramagnetic after solution heat treatment, but as sensitization increases, its magnetic properties change. In this study, fea sibility of nondestructive evaluation of sensitization of alloy 600 is discussed focusing on its magnetic properties. To investigate the relationship between magnetic properties and sen sitization, alloy 600 were heated in different temperatures and duration. Then, the relationship between magnetic properties and sensitizat...
英字タイトル:
Evaluation of Sensitization of Ni Base Alloys using Electromagnetic Nondestructive EvaluationMethod
第7回
非線形渦電流法を用いた材料劣化評価
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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Authors have proposed non-linear eddy current method which is a novel material characterization method foc using on the non-linearity of magnetic properties. This method can be a effective tool to evaluate materia l degradations if the micro-structure changes due to degradations link with change of magnetic properties. In this paper, some examples of its applications are reviewed together with its principle of assessment....
英字タイトル:
Nondestructive Evaluation of Material Degradation by Non-linear Eddy Current Method
第12回
高温機器モニタリングを目指した高温用電磁超音波 プローブの開発と評価
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,尾形 翔平,Shohei OGATA,Gerd DOBMANN
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Abstract: An electromagnetic acoustic transducer (EMAT) design using an air-cored solenoid coil as a pulsed electromagnet is proposed for high-temperature non-contact monitoring, and prototype probe is evaluated through performance test in the range from room temperature to 700°C. The coil generates a biasing magnetic field that enables the device to overcome the Curie temperature limitations of conventional EMATs. Pulsed echo measurements of carbon steel are performed at high temperatures, and verify ...
英字タイトル:
Development and Evaluation of High Temperature EMAT Aiming at Monitoring of High Temperature Components