• Title, Summary, Keyword: Electric probe

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A Study On Fatigue Properties Of BeCu Thin Film For Probe Tip (프루브 팁용 BeCu 박막의 피로성질 연구)

  • Shin, Myung-Soo;Park, Jun-Hyub;Seo, Jeong-Yun
    • Proceedings of the KSME Conference
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    • pp.256-259
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    • 2008
  • An micro-probe tip must be manufactured using thin film to evaluate integrity of the semiconductor with narrow distance between pads. In this study, fatigue tests were performed for BeCu thin film which is used in micro-probe tip of semiconductor test machine. The thin film was manufactured by electro plating process, and the specimens were fabricated by wire-cut electric discharge method to make hour glass type specimen of $5000{\mu}m$ width, $29200{\mu}m$ length and $30{\mu}m$ thickness. The fatigue test of load control with 10Hz frequency was performed, in ambient environment. The fatigue cycles were tension-tension with mean stress, at stress ratio, R=0.1.

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Characteristics of the EM Probe with Differential Shapes for Partial Discharge Diagnosis (페라이트 형상에 따른 부분방전 진단용 EM Probe의 특성)

  • Yang, Sang-Hyun;Lee, Se-Il;Lee, Yong-Sung;Park, Noh-Joon;Kim, Hee-Dong;Park, Hyung-Jun;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.398-399
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    • 2009
  • 본 논문에서는 XLPE 전력케이블 접속부의 부분방전을 측정하기 위한 Ferrite 형상에 따른 EM Probe를 설계하였다. 부분방전 펄스의 검출대역를 넓이기 위해 투자율이 2400인 페라이트코어를 사용하여 센서를 제작하였고 형상에 따른 특성을 비교하기위하여 실린더형 Ferrite와 말굽형 Ferrite를 적용하였다. 또한 부분방전 검출능력을 확인하기 위해 상용 HFCT센서의 비교 실험을 통하여 위상특성과 주파수 특성을 분석하였다.

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Development of an Optical Probe for Measuring Blood Flow in Dental Pulp (치수혈류 측정을 위한 광 프로브 개발)

  • Jang, Kyung-Hwan;Choi, Joon-Yul;Koo, Jeong-Mo;Kwon, Min-Kyung;Kim, Deok-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.8
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    • pp.1204-1209
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    • 2012
  • To diagnose dental pulp vitality, electric pulp tester has been widely used, which is a method to test condition of nerve. However, especially in the case of patients with trauma, nerve desensitization could temporarily occur even though nerve might be recovered by blood flow within the pulp later, which implies that blood flow in dental pulp is also an important factor for diagnosing vitality. This paper described the development of a probe that relatively measured blood flow in dental pulp using photoplethysmography (PPG). The probe emits four different wavelength light sources including three visible and an infrared light. We tested which light source detect sensitively the blood flow in dental pulp. As a result, green light had the largest peak to peak voltage and the power spectrum among different wavelengths.

Electrical and Optical Characteristics of Inductively Coupled Plasma by Ar Gas Pressure and Rf Power (Ar 가스 압력과 RF 전력에 따른 유도결합형 플라즈마의 전기적 및 광학적 특성)

  • 최용성;허인성;이영환;박대희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.5
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    • pp.560-566
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    • 2004
  • In this paper, the electrical and emission properties of electrodeless fluorescent lamp were discussed using the inductively coupled plasma (ICP) with the variation of argon gas pressure and RF power. The RF output was applied to the antenna in the range of 5∼50 W at 13.56 MHz. The internal plasma voltage of the chamber and the probe current were measured while varying the supply voltage to the Langmuir probe in the range of -100V∼+100V. When the pressure of argon gas was increased, electric current was decreased. There was a significant electric current increase from 10 to 30 W. Also, when the RF power was increased, electron density was increased. Also, the emission spectrum, Ar- I lins, luminance were investigated. At this time, the input parameter for ICP RF plasma, Ar gas pressure and RF power were applied in the range of 10∼60 mTorr, 10∼300 W, respectively. This implies that this method can be used to find an optimal RF power for efficient light illumination in an electrodeless fluorescent lamp.

Development of Profile Technique for Steam Generator Tubes in Nuclear Power Plants Using $8{\times}1$ Multi-Array Eddy Current Probe ($8{\times}1$ 다중코일 와전류탐촉자를 이용한 원전 증기발생기 전열관 단면형상검사 기법 개발)

  • Nam, Min-Woo;Lee, Hee-Jong;Kim, Cheol-Gi
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.2
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    • pp.184-190
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    • 2008
  • Various ECT techniques have been applied basically to assess the integrity of steam generator tithing in nuclear power plant. Among these techniques, the bobbin probe technique is applied generally to examine the volumetric flaws such as a crack-like defect and wear which is generally occurred on steam generator tubing, and additionally MRPC probe is used to examine closely tile top of tubesheet and bending regions due to the high possibility of cracking. Dent and bulge also may be formed on tube during installation process and operation of steam generator, but the dent and bulge indications greater than specific size criteria are recorded on examination report because these indications are not considered as flaw. These indications can be easily detected with bobbin probe and approximately sized with profile bobbin probe, but the size and shape can not be accurately verified. Accordingly, in this study, the $8{\times}1$ multi-array EC probe was designed to increase the measurement accuracy of the sectional profiling EC testing of tube. As a result, we would like to propose the application of $8{\times}1$ multi-array EC probe for the measurement of size and shape of profile change on steam generator tube in OPR-1000 nuclear power plant.

PD Diagnosis on High Voltage Rotating by Using New Prototype Patch Antenna Sensor (prototype 패치 안테나를 이용한 고압 회전기의 부분방전 측정 연구)

  • Lwin, K.S.;Shin, D.H.;Lim, K.J.;Kong, T.S.;Kim, H.D.;Park, N.J.;Park, D.H.
    • Proceedings of the KIEE Conference
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    • pp.169-171
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    • 2007
  • We studied the partial discharge detecting by sensing electromagnetic wave emitted from the partial discharge source in the HV Rotating Machine with the new prototype patch antenna sensor. In this study, we design new type of patch antenna based on microstrip technology and make many experiments of elaine testing compare with the existing HFCT and EM probe on stator winding of HV generator in the laboratory. This paper will mention comparison of experimental results based on the three kinds of sensors.

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Performance Research of a Jacket Cooling Water System in a Diesel Electric Generation (디젤발전 자켓냉각시스템 열성능 향상 연구)

  • Lee, Jae-Keun;Moon, Jeon-Soo;Yoon, Seok-Won;Park, Pill-Yang
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.6
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    • pp.534-539
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    • 2009
  • One of the most efficient techniques improving the heat transfer performance of a diesel electric generation is a corrosion control in jacket cooling water system. The environmental parameters most affecting corrosion are dissolved salt concentration, temperature, and pH of cooling water. No corrosion occurs in carbon steel probe at pH 11 in normal operating condition of diesel electric generation cooling water. pH control agent in this study is trisodium phosphate. pH control appears to be the most convenient way to enhance the thermal performance of a diesel electric generation.

Reliability Design of MEMS based on the Physics of Failures by Stress & Surface Force (응력 및 표면 고장물리를 고려한 MEMS 신뢰성 설계 기술)

  • Lee, Hak-Joo;Kim, Jung-Yup;Lee, Sang-Joo;Choi, Hyun-Ju;Kim, Kyung-Shik;Kim, J.H.
    • Proceedings of the KSME Conference
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    • pp.1730-1733
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    • 2007
  • As semiconductor and MEMS devices become smaller, testing process during their production should follow such a high density trend. A circuit inspection tool "probe card" makes contact with electrode pads of the device under test (DUT). Nowadays, electrode pads are irregularly arranged and have height difference. In order to absorb variations in the heights of electrode pads and to generate contact loads, contact probes must have some levels of mechanical spring properties. Contact probes must also yield a force to break the surface native oxide layer or contamination layer on the electrodes to make electric contact. In this research, new vertical micro contact probe with bellows shape is developed to overcome shortage of prior work. Especially, novel bellows shape is used to reduce stress concentration in this design and stopper is used to change the stiffness of micro contact probe. Variable stiffness can be one solution to overcome the height difference of electrode pads.

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Simultaneous Detection of Biomolecular Interactions and Surface Topography Using Photonic Force Microscopy

  • Heo, Seung-Jin;Kim, Gi-Beom;Jo, Yong-Hun
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.402.1-402.1
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    • 2014
  • Photonic force microscopy (PFM) is an optical tweezers-based scanning probe microscopy, which measures the forces in the range of fN to pN. The low stiffness leads proper to measure single molecular interaction. We introduce a novel photonic force microscopy to stably map various chemical properties as well as topographic information, utilizing weak molecular bond between probe and object's surface. First, we installed stable optical tweezers instrument, where an IR laser with 1064 nm wavelength was used as trapping source to reduce damage to biological sample. To manipulate trapped material, electric driven two-axis mirrors were used for x, y directional probe scanning and a piezo stage for z directional probe scanning. For resolution test, probe scans with vertical direction repeatedly at the same lateral position, where the vertical resolution is ~25 nm. To obtain the topography of surface which is etched glass, trapped bead scans 3-dimensionally and measures the contact position in each cycle. To acquire the chemical mapping, we design the DNA oligonucleotide pairs combining as a zipping structure, where one is attached at the surface of bead and other is arranged on surface. We measured the rupture force of molecular bonding to investigate chemical properties on the surface with various loading rate. We expect this system can realize a high-resolution multi-functional imaging technique able to acquire topographic map of objects and to distinguish difference of chemical properties between these objects simultaneously.

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