• Title, Summary, Keyword: Ultrasonic C-scanner

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Computerization of Ultrasonic Scanner (초음파 주사장치의 Computer화)

  • Kim, Young-Hwan;Kim, Young-Gil;Lee, Se-Kyung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.4 no.2
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    • pp.15-19
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    • 1985
  • Computerization of ultrasonic scanner is considered to achieve more quantitative and reliable ultrasonic testing. Testech LS-24 ultrasonic scanner is modified, and step motors in this modified ultrasonic scanner are driven by multiprogrammer controlled by computer. Two step motors can be controlled independently and simultaniously. The performance of computerized ultrasonic scanner is examined entloying modified C scan for a flat bottom hole ultrasonic reference block.

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Developement of Ultrasonic Handy Scanner for Welding Inspection (초음파를 이용한 용접부 핸디 스캔 검사기 개발)

  • Kang, Dong-Myeong
    • Journal of the Korean Society of Safety
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    • v.20 no.3
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    • pp.14-18
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    • 2005
  • The ultrasonic handy scanner to be developed in this research is a nondestructive inspection equipment with various facility. The ultrasonic inspection is the technique area which apply range is increasing greatly with IT. The purpose of this research is development of a ultrasonic handy scan inspection device with the utility in a work spot. The ultrasonic handy scanner to be developed with portability in this research is able to carry out the spot inspection. It can contribute to the quality improvement, cost reduction and safety design.

A study on Computer-controlled Ultrasonic Scanning Device (컴퓨터제어에 의한 자동초음파 탐상장치에 관한 연구)

  • Huh, H.;Park, C.S.;Hong, S.S.;Park, J.H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.9 no.1
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    • pp.30-38
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    • 1989
  • Since the nuclear power plants in Korea have been operated in 1979, the nondestructive testing (NDT) of pressure vessels and/or piping welds plays an important role for maintaining the safety and integrity of the plants. Ultrasonic method is superior to the other NDT method in the viewpoint of the detectability of small flaw and accuracy to determine the locations, sizes, orientations, and shapes. As the service time of the nuclear power plants is increased, the radiation level from the components is getting higher. In order to get more quantitative and reliable results and secure the inspector from the exposure to high radiation level, automation of the ultrasonic equipments has been one of the important research and development(R & D) subject. In this research, it was attempted to visualize the shape of flaws presented inside the specimen using a Modified C-Scan technique. In order to develope Modified C-Scan technique, an automatic ultrasonic scanner and a module to control the scanner were designed and fabricated. IBM-PC/XT was interfaced to the module to control the scanner. Analog signals from the SONIC MARK II were digitized by Analog-Digital Converter(ADC 0800) for Modified C-Scan display. A computer program has been developed and has capability of automatic data acquisition and processing from the digital data, which consist of maximum amplitudes in each gate range and locations. The data from Modified C-Scan results was compared with shape from artificial defects using the developed system. Focal length of focused transducer was measured. The automatic ultrasonic equipment developed through this study is essential for more accurate, reliable, and repeatable ultrasonic experiments. If the scanner are modified to meet to appropriate purposes, it can be applied to automation of ultrasonic examination of nuclear power plants and helpful to the research on ultrasonic characterization of the materials.

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A Study on the Influence of Stacking Sequences using CFRP Laminate Plates by Falling Weight Impact (탄소섬유복합평판에 낙추충격을 가할 때 적층구성에 미치는 영향에 관한 연구)

  • 임광희;박노식;양인영
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.106-109
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    • 2000
  • Impact tester was build up to evaluate the characterization of CFRP laminate plates under the low velocity impact. The tests were conducted on several laminates of different ply orientation A system was budded for the impact strength of CFRP laminates in consideration of stress wave propagation theory using drop-weight impact tester as one of impact test. Results indicate that absorbed energy of quasi-isotropic specimen having four interfaces is higher than that of orthotropic laminates with two interfaces. Also the damage area was measured with ultrasonic C-scanner on some samples. In the specimens the relationship was linear between damaged area and absorbed energy to some degree. Absorbed energy in the specimen that ply number, interface number and fiber stacking sequences is same but having hybrid is higher than that of orthotropic laminates without hybrid.

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Ultrasonic C-scan System Development Using DSP (DSP 를 이용한 초음파 C-scan 시스템 개발)

  • Nam, Young-Hyun;Seong, Un-Hak;Kim, Jeong-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.7
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    • pp.32-39
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    • 1999
  • Digital signal processor (DSP) is used to obtain the peak value and the time difference of ultrasonic signals, to make digital filter, and to derive mathematical transformation from analog circuit. In this study, C-scan system and control program have been developed to high speed data acquisition. This system consists of signal processing parts (DSP, oscilloscope, pulser/receiver, digitizer), scanner, and control program. The developed system has been applied to a practical ultrasonic testing in overlay weld, and demonstrated high speed with precision

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A STUDY ON IMPACT CHARACTERISTICS OF THE STACKING SEQUENCES IN CFRP COMPOSITES SUBJECTED TO FALLING-WEIGHT IMPACT LOADING

  • Im, K.H.;Park, N.S.;Kim, Y.N.;Yang, I.Y.
    • International Journal of Automotive Technology
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    • v.4 no.4
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    • pp.203-211
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    • 2003
  • This paper describes a method for a falling weight impact test to estimate the impact energy absorbing characteristics and impact strength of CFRP (Carbon-fiber reinforced plastics) laminate plates based on considerations of stress wave propagation theory, which were converted to measurements of load and displacement verses time. The delamination area of impacted specimens for the different ply orientations was measured with an ultrasonic C-scanner to determine the correlation between impact energy and delamination area. The energy absorbed by a quasi-isotropic specimen having four interfaces was higher than that of orthotropic laminates with two interfaces. The more interfaces, the greater the energy absorbed. The absorbed energy of a hybrid specimen embedding GFRP (Glass-fiber reinforced plastics) layer was higher than that of normal specimens. Also, a falling weight impact tester was built to evaluate the characteristics and impact strength of CFRPs.

Ultrasonic Approach of Rayleigh Pitch-catch Contact Ultrasound Waves on CFRP Laminated Composites

  • Yang, In-Young;Im, Kwang-Hee;Heo, Uk;Hsu, David K.;Sim, Jae-Ki;Kim, Hak-Joon;Song, Sung-Jin
    • Journal of Korea Foundry Society
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    • v.27 no.5
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    • pp.209-211
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    • 2007
  • 최근에는 탄소섬유강화복합재료(CFRP)는 우수한 기계적인 물성치와 수월한 설계특성으로 인해 우주.민간 항공산업분야 뿐만 아니라 여러분야에 응용성이 매우 높다. 그러나 CFRP 복합적층판으로 제작된 구조물은 충격손상을 받을 시에는 50-75%치 강도가 낮아지는 취약성을 가지고 있다. 따라서 본 연구에는 CFRP복합재의 구조건전성 및 결함여부를 비파괴적으로 검사 및 탐상을 하기 위해서 시도하였다. 특히, C-scanner의 수침조에서 충격손상을 받은 시험편을 집어넣어 자동 데이터 획득 시스템을 구동하여 현장응용성이 가장 높은 일 방향 초음파측정 (one-sided ultrasonic measurement) 방법인 평가기법을 제안하였다. 본 연구에서 제안한 일방향 초음파 피치캐치방법이 CFRP 복합적층판내에서 일반 수직 초음파 탐상기법보다 훨씬 민감함을 알 수 있었다.

Effects of Settings in Dynamic Ranges and Frequency Modes on Ultrasonic Images (초음파 영상에서 동적영역과 주파수 방식의 설정에 따른 효과)

  • Yang, Jeong-Hwa;Kang, Gwan-Suk;Lee, Kyung-Sung;Paeng, Dong-Guk;Choi, Min-Joo
    • Journal of radiological science and technology
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    • v.32 no.3
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    • pp.277-283
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    • 2009
  • It is important to get clinical ultrasonic images of good quality for accurate diagnosis. In this study, it observed the change of ultrasonic images against setting frequency, dynamic range(DR) and type of probes on ultrasonic scanner. In the experiment it evaluated image of LCS (Low Contrast Sensitivity) targets(-15, -6, -3, +3, +6, +15 dB) of a standard ultrasonic test phantoms(539,551, ATS, USA) similar to solid and cystic lesions. Its imaged from convex (C3-7IM) and linear probe (L5-12IM) on SA-9900 (Medison Ltd, Korea) scanner. The images obtained altering the setting parameters which are frequency(gen, pen, res, harmonic) mode and DR($40{\sim}100\;dB$). The quality of images evaluated compare with the nominal LCS value of target and measured LCS value. The results show that there was no significant changing of quality images altering DR 40, 60, 80, 100 dB against frequency in Convex probe but the image being the highest in LCS target at DR 60 dB, harmonic of frequency mode in the -15 dB target close to cystic lesion. In Linear probe, DR 40 dB, harmonic mode at -15 dB LCS target close to nominal value. It discussed necessity of evaluation about ROC(Receiver Operating Characteristic) from the psychological viewpoint and limit of evaluation from quantified images.

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Influence of Resin-Infiltrated Time on Wood Natural Materials Using Conventional/Air-Coupled Ultrasound Waves

  • Park, Je-Woong;Kim, Do-Jung;Kweon, Young-Sub;Im, Kwang-Hee;Hsu, David K.;Kim, Sun-Kyu;Yang, In-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.3
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    • pp.235-241
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    • 2009
  • Composite wood materials are very sensitive to water and inspection without any coupling medium of a liquid is really needed to wood materials due to the permeation of coupling medium such as water. However, air-coupled ultrasound has obvious advantages over water-coupled experimentation compared with conventional C-scanner. In this work, it is desirable to perform contact-less nondestructive evaluation to assess wood material homogeneity. A wood material was nondestructively characterized with non-contact and contact modes to measure ultrasonic velocity using automated data acquisition software. We have utilized a proposed peak-delay measurement method. Also through transmission mode was performed because of the main limitation for air-coupled transducers, which is the acoustic impedance mismatch between most materials and air. The variation of ultrasonic velocity was found to be somewhat difference due to air-coupled limitations over conventional scan images. However, conventional C-scan images are well agreed with increasing the resin-infiltrated time as expected. Finally, we have developed a measurement system of an ultrasonic velocity based on data acquisition software for obtaining ultrasonic quantitative data for correlation with C-scan images.

Effects of Ultrasonic Scanner Setting Parameters on the Quality of Ultrasonic Images (초음파 진단기의 설정 파라미터가 영상의 질에 미치는 효과)

  • Yang, Jeong-Hwa;Lee, Kyung-Sung;Kang, Gwan-Suk;Paeng, Dong-Guk;Choi, Min-Joo
    • The Journal of the Acoustical Society of Korea
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    • v.27 no.2
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    • pp.57-65
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    • 2008
  • Setting parameters of Ultrasonic scanners influence the quality of ultrasonic images. In order to obtain optimized images sonographers need to understand the effects of the setting parameters on ultrasonic images. The present study considered typical four parameters including TGC (Time Gain Control), Gain, Frequency, DR (Dynamic Range). LCS (low contrast sensitivity) was chosen to quantitatively compare the quality of the images. In the present experiment LCS targets of a standard ultrasonic test phantom (539, ATS, USA) were imaged using a clinical ultrasonic scanner (SA-9000 PRIME, Medison, Korea). Altering the settings in the parameters of the ultrasonic scanner, 6 LCS target images (+15 dB, +6 dB, +3 dB, -3 dB, -6 dB, -15 dB) to each setting were obtained, and their LCS values were calculated. The results show that the mean pixel value (LCS) is the highest at the max setting in TGC, mid to max in gain and pen mode in frequency and 40-66 dB in DR. Among all images, the image being the highest in LCS was obtained at the setting of DR 40 dB. It is expected that the results will be of use in setting the parameters when ultrasonically examining masses often clinically found In either solid lesions (similar to +15, +6, +3 dB targets) or cystic lesions (similar to -15, -6, -3 dB targets).