Search Results 1-20 of 314

  • Cepstral Subtraction for Ultrasonic Signal Processing in Liquid-film Thickness Measurement under High-temperature and High-pressure Conditions of Boiling Water Reactors  [in Japanese]

    FURUICHI Hajime , KATONO Kenichi , YASUDA Kenichi

    … <p>We have been developing the ultrasonic liquid film sensor to measure the liquid film thickness under high-temperature and high-pressure conditions of Boiling Water Reactors (BWRs), focusing on thin film thickness in pre-/post-dryout. … The liquid film sensor utilizes Time-of-Flight (ToF) detection based on the ultrasonic pulse-echo method. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(4), 520-531, 2020

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  • Effect of Hydrogen on the Sound Velocity of fcc-Fe at High Pressures and High Temperatures

    Shibazaki Yuki , Nishida Keisuke , Tobe Hiromu , Terasaki Hideori , Higo Yuji

    … and fcc-Fe by using a pulse-echo overlap technique at high pressures and high temperatures at BL04B1. …

    SPring-8/SACLA Research Report 8(2), 274-277, 2020

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  • Basic and recent applied technologies of ultrasound in the field of clinical diagnosis

    Akiyama Iwaki

    … <p>This paper reviews the basic imaging methods available using ultrasonic diagnostic equipment, including the pulse-echo method, beamforming for improving image resolution, and harmonic imaging using the nonlinearity of ultrasonic waves. …

    Acoustical Science and Technology 41(6), 845-850, 2020

    J-STAGE 

  • Study on Improving Accuracy of Internal Temperature Monitoring of Heating Materials  [in Japanese]

    SAWADA Ryoichi , OGAWA Yoji , IHARA Ikuo

    … <p>It is known that ultrasonic thermometry is a useful method to make noninvasive and nondestructive measurements of internal temperatures of heated materials. … When a thin layer less than one wavelength of ultrasonic waves is in contact with the back surface of a material to be estimated, multiple reflections within the layer occur and result in the distortion of the ultrasonic waveform reflected at the back surface. …

    The Proceedings of the Materials and processing conference 2019.27(0), 524, 2019

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  • Influence of a Back Surface Layer in Measuring Ultrasonic Propagation Time by Pulse-Echo Method and Its Reduction Techniques  [in Japanese]

    SAWADA Ryoichi , IHARA Ikuo

    … <p>It is quite important for various ultrasonic measurements and evaluations with pulse-echo method to determine the transit time of the ultrasonic wave accurately. … When a thin layer less than one wavelength is deposited on a back surface of a material to be measured, multiple reflections in the layer occur and distort the pulse-echo waveforms. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), J04314P, 2019

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  • Study on Accuracy Improvement in Ultrasonic Thermometry Based on Pulse-Echo Method

    Sawada Ryoichi , Ogawa Yoji , Ihara Ikuo

    The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2019(0), 1008B1345, 2019

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  • Evaluation of mechanical properties of (Ce,Gd)O<sub>2-x</sub> as a surrogate for (U,Gd)O<sub>2-x</sub> solid solutions

    Van Mao Pham , Arima Tatsumi , Inagaki Yaohiro , Idemitsu Kazuya

    … The mechanical properties were estimated from the sound velocities measured by the ultrasonic pulse-echo method. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1927, 2019

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  • Ultrasonic Velocity-change Imaging with Near-infrared Light and Its Application to Diagnosis of Vascular Plaque

    HORINAKA Hiromichi

    … <p>Ultrasonic velocity-change imaging using near-infrared irradiation has potential as a technique for non-invasive evaluation of tissue characteristics. … This method is based on the principle that tissue boundaries in the living body can be detected by measuring the change in velocity of the echo pulse. … A basic experiment was conducted to examine the effectiveness of this method for the diagnosis of unstable plaque in blood vessels. …

    NIHON GAZO GAKKAISHI (Journal of the Imaging Society of Japan) 58(6), 626-632, 2019

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  • Defect Identification by Active Pulse Echo Method Using Time Reversal Method  [in Japanese]

    Nakamura Seigo , Kubo Shiro

    … <p>The applicability of the active pulse echo method to defect identification was investigated. … In this method, ultrasonic waves are activated by applying an electric pulse to the piezo film and waves reflected at crack tip are received on the piezoelectric film. … The method was applied to actual data. …

    The Proceedings of Conference of Kansai Branch 2019.94(0), 217, 2019

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  • Sound velocity measurements of ε–FeOOH up to 24 GPa

    IKEDA Osamu , SAKAMAKI Tatsuya , OHASHI Tomonori , GOTO Masahisa , HIGO Yuji , SUZUKI Akio

    … <p>The sound velocity and density of ε–FeOOH have been simultaneously measured up to 24 GPa at room temperature using an ultrasonic pulseecho–overlap method and a Kawai–type multi–anvil apparatus at BL04B1 in SPring–8. …

    Journal of Mineralogical and Petrological Sciences 114(3), 155-160, 2019

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  • IMAGE SHARPENING OF LINEARIZED INVERSE SCATTERING METHOD FOR CONCRETE VOIDS  [in Japanese]

    TSUNODA Takaya , SUZUKI Keigo

    <p> 欠陥からの散乱波が有する欠陥形状情報を活用し欠陥形状を再構成する有効手法の一つとして,線形化逆散乱解析が挙げられる.本研究では,この手法のコンクリート試験体への適用において,特徴周波数の抽出に有効な寄生的離散ウェーブレット変換を適用し,骨材や空隙などの散乱ノイズが含まれる波形データから欠陥からの散乱波の特徴を有する周波数帯を抽出することで欠陥像の鮮明化を図る.超音波探傷実験によ …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 75(1), 23-36, 2019

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  • Underwater Target Ranging Using Multi-Channel Time Reversal Method and Sensitivity Compensated Signal  [in Japanese]

    NAKASE Momoka , TOH Ryo

    … <p>The ultrasonic pulse-echo method is an essential technique for underwater target ranging, and a pulse compression method with a modulated transmitting signal is usually employed to enhance both the signal-to-noise ratio and the resolution. …

    The Journal of the Marine Acoustics Society of Japan 46(1), 1-13, 2019

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  • Study on ultrasonic evaluations of molten polymer by ultrasonic buffer rod method  [in Japanese]

    倉内 健行 , 阿部 将典 , 井原 郁夫

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 117(441), 49-52, 2018-02-19

  • Elastic wave velocity measurements of ε-FeOOH at high pressure  [in Japanese]

    Ikeda Osamu , Sakamaki Tatsuya , Ohashi Tomonori , Goto Masahisa , Higo Yuji , Suzuki Akio

    地球内部の水の貯蔵に寄与する含水鉱物として,酸化水酸化鉄ε-FeOOHに着目した.ε-FeOOHの弾性的性質に関しては第一原理計算に基づいて低スピン状態のε-FeOOH(温度0 K)が研究されている(Thompson et al., 2017)が,低圧力側の高スピンε-FeOOHの弾性波速度は計算・測定されていない.本研究では高スピンε-FeOOHの弾性的性質を明らかにするために,SPring-8 …

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2018(0), 82, 2018

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  • Development of Measurement Technique for Leakage and Fuel Debris Inspection Using Ultrasonic Array Sensors  [in Japanese]

    SHOJI Naruki , KAWACHI Takuya , TAKAHASHI TAKAHASHI , KIKURA Hiroshige

    … An ultrasonic measurement system was development as a method for inspecting inside the primary containment vessel (PCV), especially for identifying leakage points and determining fuel debris distribution in the decommissioning of Fukushima Dai-ichi nuclear power plant. …

    The Proceedings of the National Symposium on Power and Energy Systems 2018.23(0), B223, 2018

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  • Defect Identification by Active Pulse Echo Method with Time Reversal Method: Effect of Number of Probes  [in Japanese]

    Nakamura Seigo , Kubo Shiro

    … <p>The applicability of the active pulse echo method to defect identification was investigated. … In this method, ultrasonic waves are activated by applying an electric pulse to the piezo film and waves reflected at crack tip are received on the piezoelectric film. … The method was applied to experimental data also. …

    The Proceedings of Conference of Kansai Branch 2018.93(0), 202, 2018

    J-STAGE 

  • Evaluation of the height of internal periodic triangular surfaces by ultrasonic backscatter

    NGUYEN Chanh Nghia , KUROKAWA Yu , INOUE Hirotsugu

    … For evaluating such internal surfaces, ultrasonic technique is one of the most effective among others. … In this paper, an ultrasonic pulse-echo technique, namely, master curve technique is developed for evaluating the pitch and the height of periodic triangular surfaces which is inaccessible or hidden on the back side. … The validity of the proposed method was verified by both numerical simulation and experiment. …

    Mechanical Engineering Journal 5(2), 17-00585-17-00585, 2018

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  • Defect Identification by Active Pulse Echo Method with Time Reversal Method:-Experimental Verification-  [in Japanese]

    NAKAMURA Seigo , KUBO Shiro

    … <p>The applicability of the active pulse echo method to defect identification was investigated. … In this method, ultrasonic waves are activated by applying an electric pulsed to the piezo film and waves reflected at crack tip are received on the piezoelectric film. … To estimate the crack tip location the time reversal method was applied. …

    The Proceedings of the Materials and Mechanics Conference 2017(0), OS0211, 2017

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  • Ultrasonic direction measurement using sensitivity-compensated signal and band expansion method based on linear prediction

    Chimura Dai , Toh Ryo , Motooka Seiichi

    … High-resolution ultrasonic pulse-echo measurement is discussed. … For higher time resolution, a sensitivity-compensated (SC) signal and a method of band expansion using linear prediction (LP) processing have been proposed. …

    Acoustical Science and Technology 38(2), 71-79, 2017

    J-STAGE 

  • Feasibility Study on Molten Plastic Evaluation by Ultrasonic Buffer Rod Method  [in Japanese]

    ABE Masanori , IHARA Ikuo

    The Proceedings of the Materials and processing conference 2016.24(0), 325, 2016

    J-STAGE 

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