• Title/Summary/Keyword: ultrasonic applications

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Model for Predicting Ultrasonic NDE Reliability and Statistical Data Analysis of Piping Inspection Round Robin

  • Park, Ik-Keun;Kim, Hyun-Mook
    • International Journal of Reliability and Applications
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    • v.5 no.1
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    • pp.25-36
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    • 2004
  • Ultrasonic inspection system consist of the examination procedures, equipment, and operators. The reliability of nondestructive testing is influenced by the inspection environment, materials and types of defect. It is very difficult to estimate the reliability of NDT due to the various factors. Piping inspection round robin was conducted to quantify the capability of ultrasonic inspection during in-service. In this study, the models for predicting the ultrasonic NDE reliability by logistic model and linear regression model are discussed. The utility of the NDT reliability assessment is verified by the analysis of the data from round robin test with these models.

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Development of Ultrasonic Transducer System for Wireless Power Transfer Part 1 : Transmitter Development (무선 전력전송을 위한 초음파 트랜스듀서 시스템 개발 Part 1: 송신소자 개발)

  • Youm, Woo-Sub;Hwang, Gunn;Yang, Woo-Seok;Lee, Sung-Q
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.9
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    • pp.845-852
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    • 2012
  • Recently, wireless power transfer technology is ready to be commercialized in consumer electronics. It draws attention from not only experts but also public because of its convenience and huge market. However, previous technologies such as magnetic resonance and induction coupling have limited applications because of its short transfer distance compared to device size and magnetic intensity limitation on the safety of body exposure. As an alternative, ultrasonic wireless power transfer technology is proposed. The ultrasonic wireless power transfer system is composed of transmitter which converts electrical energy to ultrasonic energy and receiver which converts the ultrasonic energy to the electrical energy again. This paper is focused on the development of high energy conversion efficiency of ultrasonic transmitter. Optimal transfer frequency is calculated based on the acoustic radiation and damping effect. The transmitter is designed through numerical analysis, and is manufactured to match the optimal transfer frequency with the size of 100 mm diameter, 12.2 mm thickness plate. The energy conversion efficiency of about 13.6 % at 2 m distance is obtained, experimentally. This result is quite high considered with the device size and the power transfering distance.

Development of ultrasonic transducer system for wireless power transfer Part 1: Transmitter development (무선 전력전송을 위한 초음파 트랜스듀서 시스템 개발 Part 1: 송신소자 개발)

  • Youm, Woo-Sub;Hwang, Gunn;Lee, Sung-Q
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.771-776
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    • 2012
  • Recently, wireless power transfer technology is ready to be commercialized in consumer electronics. It draws attention of not only experts but also public because of its convenience and huge market. However, previous technologies such as magnetic resonance and induction coupling have limited applications because of its short transfer distance compared to device size and magnetic intensity limitation for the safety of body exposure. As an alternative, ultrasonic wireless power transfer technology is proposed. The ultrasonic wireless power transfer system is composed of transmitter which converts electrical energy to ultrasonic energy and receiver which converts the ultrasonic energy to the electrical energy again. This paper is focused on the development of high energy conversion efficiency of ultrasonic transmitter. Optimal transfer frequency is calculated based on the acoustic radiation and damping effect. The transmitter is designed through numerical analysis, and is manufactured to match the optimal transfer frequency with the size of 100mm diameter, 12.2 mm thickness plate. The energy conversion efficiency of about 13.6% at 2m distance is obtained, experimentally. This result is quite high considered with the device size and the power transfer distance.

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Development of Ultrasonic Sediment-level Sensor for Sewage Pipe Application (하수관 퇴적물 감지를 위한 초음파 퇴적센서 개발)

  • Park, Buem-Keun;Shin, Jeong-Hee;Paik, Jong-Hoo;LEE, Young-Jin
    • Journal of Sensor Science and Technology
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    • v.30 no.1
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    • pp.25-29
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    • 2021
  • In this study, we successfully developed a highly reliable ultrasonic sediment sensor to detect the sediment levels in sewer pipes in harsh environments. The ultrasonic transducer employed in the ultrasonic sediment sensor was designed so as to possess a simple structure. The developed sensor was carefully optimized by simulating the electromechanical characteristics, radiated sound wave pressures, and directivity via finite element analysis. It was also designed to possess a simple mounting structure minimizing the flow disturbance in a 400-mm sewer pipe; additionally, eight ultrasonic transducers were arranged in a four-channel mode, allowing for measurement of the sediment height in five easy steps. Through experimental evaluations, we verified the performance of the ultrasonic sediment-level sensor and its industrial applicability. The results suggested that although the precision value was notably low at 15 mm, the sediment detection performance was adequate; therefore, the developed sensor can potentially be used in industrial applications.

Measurements of Ultrasonic Velocity and Attenuation by Signal Processing Techniques in Time and Frequency Domains (시간 및 주파수 영역에서의 신호 처리 기술에 의한 초음파 속도와 감쇠의 측정)

  • Jang, Young-Su;Kim, Jin-Ho;Jeong, Hyun-Jo;Nam, Young-Hyun
    • Journal of the Korean Society for Nondestructive Testing
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    • v.19 no.2
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    • pp.118-128
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    • 1999
  • There are many ultrasonic measurement methods that are used in nondestructive testing applications. Some typical applications include material property determination, microstructural characterization. and flaw detection. Ultrasonic parameters such as velocity and attenuation are most commonly required in these applications. The accuracy and repeatability of testing results are dependent on both the hardware used to generate and receive the ultrasonic waves and on the analysis software for calculating these parameters. In this study, five analysis algorithms were implemented on a computer for measuring wave speed in a pulse echo. immersion testing configuration. In velocity measurements comparisons were made between the overlap. cross-correlation. Fourier transform. Hilbert transform, wavelet transform algorithms. Velocity measurement was applied to an isotropic steel sample using the five analysis algorithms. Frequency-dependent phase/group velocity and attenuation were also measured using the Fourier transform and wavelet transform algorithms on a composite laminate containing voids.

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Development of a High-power Ultrasonic System for Sonochemistry Reaction (음향화학 반응용 강력초음파 개발)

  • Lee, Yang-Lae;Kim, Hyun-Se;Baek, Min-Hyuck
    • Journal of Power System Engineering
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    • v.17 no.6
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    • pp.142-148
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    • 2013
  • High-power ultrasonic promotes a chemical reaction by its own energy, thus it has been used for sonochemistry applications. For example, it has been mostly used for mixing, reaction catalyst, dispersion and disintegration. High-power ultrasonic transducer is made with structure based on a Bolt-clamped Langevin type Transducer (BLT), But it has difficulty in the development because degradation of piezoelectric ceramic by the heat generation of BLT. In this study, for a development of the transducer of 25 kHz and 1000 W used in sonochemistry and industrial cleaning, BLT with a hole in its center and tubular type waveguide of the transducer were designed based on finite element method (FEM). The transducer was fabricated based on the design parameter, and the impedance characteristics are measured experimentally and compared with the numerical results.

Development of an Janus-type Ultrasonic Transducer for Underwater Doppler Log Applications (수중 도플러 로그용 야누스형 초음파 트랜스듀서 개발)

  • 이수성;노용래
    • The Journal of the Acoustical Society of Korea
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    • v.19 no.7
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    • pp.77-84
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    • 2000
  • In measurement of ship speed with a Doppler log sensor, we encounter the nonhorizontal movement of a ship, i.e. pitching and rolling, and that causes inaccuracy of the measurement. In this study, we develop a Janus type ultrasonic transducer that can resolve the problems in accuracy due to the pitching and other environmental factors of common ultrasonic sensors attributed to the underwater usage. For the development, we analyze the operation mechanism of the transducer, fabricate a prototype of the sensor, and evaluate its performance through experiments.

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Performance Analysis of Free-Style Writing and Drawing using Ultrasonic Position System

  • Shin, Low-Kok;Park, Soo-Hong
    • Journal of information and communication convergence engineering
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    • v.6 no.1
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    • pp.6-9
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    • 2008
  • In future domestic context aware applications the location of mobile devices is often required. Ultrasonic technology enables high resolution indoor position measurements. A disadvantage of state-of-art ultrasonic systems is that several base stations are required to estimate 3D position. This study aims to evaluate the efficiency and effectiveness of using UPS as a 3D free-hand writing or drawing tool. The processes include the design and testing of UPS as an efficient 3D free-hand writing or drawing tool in the air. The paper will further explain the system architecture of the UPS and how to use GPS as 3D free-hand writing or drawing tool. The efficiency and effectiveness of the system was confirmed by a computer software simulation. The software will further display the result of drawing or writing from the user by graphics. As a result, it is possible to implement UPS as a 3D free-hand writing or drawing tool in the air.

Advanced Microwave Plasma Technology for Liquid Treatment

  • Toyoda, Hirotaka;Takahashi, T.;Takada, N.
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.121.1-121.1
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    • 2014
  • Recently, much attention has been given to plasma production under liquid and its applications [1]. However, most of plasma production techniques reported so far utilize high voltage dc, ac, rf or microwave power [2], where damage to discharge electrodes and small discharge volume are remained issues. As an alternative of plasma production method under liquid, we have proposed pulsed microwave excited plasma using slot antenna, where damage to the slot electrode can be minimized and plasma volume can be increased. We have also reported improvement of treatment efficiency with use of reduced-pressure condition during the discharge [3]. To realize low pressure conditions in liquid, various alternative technique can be considered. One possible technique is simultaneous injection of microwave power and ultrasonic wave. Ultrasonic wave induces pressure fluctuation with the wave propagation and is so far used for cavitation production in the water. We propose utilization of reduced pressure induced by ultrasonic cavitation for improvement of the plasma production. Correlation between the plasma production and the ultrasonic power will be discussed.

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