• Title, Summary, Keyword: Electric probe

Search Result 225, Processing Time 0.05 seconds

Comparison of Incidence of PSE Pork by Lairage Time, Use of Electrical Probe, Stunning Voltage and Chilling Condition (돼지의 계류시간, 전살전압 및 도체냉각조건에 따른 PSE 발생율 비교)

  • 박범영;조인철;김일석;김진형;조수현;유영모;이종문;윤상기
    • Food Science of Animal Resources
    • /
    • v.23 no.1
    • /
    • pp.28-31
    • /
    • 2003
  • The incidence of PSE pork by lairage time, use of electric probe, stunning voltage condition and carcass chilling rate was compared. The incidence of PSE pork was 22.2% when pigs were held in lairage overnight without electric probe, whereas it was 59.3% when held in lairage for < 1.5 hr with electric probe before slaughter. The incidence of PSE pork was 42.37% when pigs were treated with 230 V of stunning condition, and was 66.67% when treated with 500V of stunning condition. The incidence of PSE pork was 52.2% when the ultimate carcass internal temperature was controlled higher than 38$^{\circ}C$ with the slow chilling(-5$^{\circ}C$ for 70 min), and was 39.6% when controlled lower than 30$^{\circ}C$ with the fast chilling(-15$^{\circ}C$ for 70 min). Results indicated that the incidence of PSE pork was decreased by 37.1% with lairage overnight and without use of electric probe, 24.3% with low voltage stunning treatment and 12.6% with fast chilling. However, the incidence of PSE pork was not significantly correlated with carcass weight.

Numerical Modeling of Perturbation Effects of Electrostatic Probe into 2D ICP(inductively coupled plasma) (2D-ICP(inductively coupled plasma)에서 정전 탐침 삽입 시의 플라즈마 수치 계산)

  • Joo, Jung-Hoon
    • Journal of the Korean institute of surface engineering
    • /
    • v.44 no.1
    • /
    • pp.26-31
    • /
    • 2011
  • Numerical modeling is used to investigate the perturbation of a single Langmuir probe (0.2 mm diameter shielded with 6 mm insulator) inserted along the center axis of a cylindrical inductively coupled plasma chamber filled with Ar at 10 mTorr and driven by 13 MHz. The probe was driven by a sine wave. When the probe tip is close to a substrate by 24.5 mm, the probe characteristics was unperturbed. At 10 mm above the substrate, the time averaged electric potential distribution around the tip was severly distorted making a normal probe analysis impossible.

On-Line Diagnosis Method for Generator Rotor Windings (발전기 운전중 회전자 진단에 관한 연구)

  • Lee, Young-Jun;Kong, Tae-Sik;Kim, Hee-Dong;Ju, Young-Ho
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1846-1849
    • /
    • 2002
  • A shorted-turn test was performed at the Sininchon combined cycle power plant on gas turbine generators. The test was conducted using a permanent flux probe and on-line diagnosis system. The flux probe installed in the generator air gap senses the field winding slot leakage flux and produces a voltage proportional to the rate of change of the flux. This pattern of flux variation is a signature unique to each field winding. We have also applied a voltage waveform analysis technique that can identify the pole location, slot number and number of shorted-turn with each slot.

  • PDF

Shorted-Turn Detction Techniques for Generator Rotor (발전기 운전중 회전자 계자권선의 단락 진단기법에 관한 연구)

  • Lee, Young-Jun;Kim, Hee-Dong;Park, Jong-Jeong;Ju, Young-Ho;Joe, Ji-Won;Lee, Byung-Ha
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1721-1724
    • /
    • 1998
  • A shorted-turn test was performed at the Pyungtaek combined cycle power plant on gas. turbine generator #4. The test was conducted using a permanent flux probe and digital oscilloscope. The flux probe installed in the generator air gap, senses the field winding slot leakage flux and produces a voltage proportional to the rate of change of the flux. This pattern of flux variation is a signature unique to each field winding. We have also applied a waveform analysis technique that can identify the pole location, slot number, and number of shorted-Turns with each slot.

  • PDF

Shorted-Turn Test for Generator Rotor Windings (발전기 회전자 권선 층간단락 진단에 관한 연구)

  • Lee, Young-Jun;Kong, Tae-Sik;Kim, Hee-Dong;Ju, Young-Ho
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1747-1749
    • /
    • 2003
  • 발전기 회전자 권선에 종종 발생하는 층간단락 현상을 찾아내는 진단기법에는 크게 두가지가 있으며, 정지중 진단기법인 분담전압 시험과 운전중 진단기법인 flux probe 시험이다. 본 논문에서는 서인천복합화력발전소 #2 스팀터빈 발전기에 대하여 분담전압 및 flux probe 시험을 시행하여 회전자 권선의 건전성을 확인하고, 그 결과를 상호 비교, 분석하여 정지중 및 운전중 진단기법의 신뢰성을 평가하였다.

  • PDF

Optimal Design of Electrical Probe of Record Device using Electric Field (전계를 이용한 기억장치 전극의 최적 설계)

  • Lee Sung-Gu;Chol Jae-Hak;Kim Yong-Su;Lee Ju;Choi Seung-Kil
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.899-901
    • /
    • 2004
  • This paper analyzes recording density according to the shape variation of Electric Probe writer, and present a shape design method for improving recording density in perpendicular electric recording device. The gradient of electric field has to be steep to improve recording density because transition region on the media becomes wider when recording. The optimum shape of electrode could be archived by using Response Surface Methodology and 2-Dimensional Finite Element Method.

  • PDF

Direct Fabrication of the Scanning Probe Tip with Multi­Walled Carbon Nanotubes Using Dielectrophoresis

  • Lee Hyung-Woo;Han Chang-Soo;Lee Eung-Sug;Chul Youm;Kim Jae Ho;Kim Soo-Hyun;Kwak Yoon-Keun
    • International Journal of Precision Engineering and Manufacturing
    • /
    • v.6 no.2
    • /
    • pp.50-54
    • /
    • 2005
  • We report a simple, low cost, and reliable method for assembling a multi-walled nanotube (MWNT) to the end of a metal coated scanning probe microscopy (SPM) tip. By dropping the MWNT solution and applying an electric field between an SPM tip and an electrode, MWNTs which were dispersed into a dielectric solution were directly assembled onto the apex of the SPM tip due to the attraction by the dielectrophoretic force. The effective measurement of a MWNT -attached SPM tip was demonstrated by direct comparison with AFM images of a standard sample with a bare AFM tip.

Electrical Properties of Inductively Coupled Plasma by Argon Pressurebstract (아르곤 압력에 따른 유도결합형 폴라즈마의 전기적 특성)

  • Lee, Y.H.;Her, I.S.;Jo, J.U.;Kim, K.S.;Lee, J.C.;Choi, Y.S.;Park, D.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.89-91
    • /
    • 2003
  • In this paper, using a Langmuir probe Ar gas characteristic of electrodeless fluorescent lamp which used an inductively coupled plasma were investigated. The RF output changed into 5-50W in 13.56MHz. At this time internal plasma voltage of the chamber and probe current were measured while changing in -70V - +70V with a supply voltage by Langmuir probe. If pressure of Ar gas was increased, the electric current tended to decrease. Also, an electric current was increased according to an increase of a RF output.

  • PDF

MOS transistor probe for surface electric properties (표면 전기 특성 측정을 위한 MOS 트랜지스터 탐침 개발)

  • Lee, Sang-Hoon;Seo, Jae-Wan;Lim, Geun-Bae;Shin, Hyun-Jung;Moon, Won-Kyu
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.1963-1966
    • /
    • 2008
  • We fabricate and evaluate the metal-oxide-semiconductor (MOS) transistor probe with the focused-ionbeam (FIB) for surface electric properties. The probes are designed with the rectangular and V-shaped structures, and their dimensions are determined considering the contact mode operation. The conductive nano tip is grown with FIB system, and deposition condition is controlled for the sharp tip. The fabricated device is applied to the various test patterns like the metal lines and PZT poling regions, and the results show the well defined measurement patterns.

  • PDF

Design and Experiment of the Corona Probe for Partial Discharge Diagnosis in Rotary Machine Stator Windings (회전기 고정자권선의 부분방전 진단을 위한 Corona probe의 설계 및 실험)

  • Yang, Sang-Hyun;Lee, Se-Il;Lee, Yong-Sung;Park, Noh-Joon;Kim, Hee-Dong;Park, Dae-Hee
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1479_1480
    • /
    • 2009
  • 부분방전시험은 고전압 고정자 권선의 절연상태를 검사, 평가 할 수 있는 중요한 수단이다. 전동기와 발전기에서 일어나는 절연 악화의 징후로써 부분방전이 발생되며 이러한 부분방전 결함의 정확한 위치 확인이 필요하다. 본 논문에서는 회전기 고정자권선의 결함위치를 판정하기위한 Prototype의 코로나 프로브를 설계하고자 Ferrite core를 이용한 Corona Probe를 제작하였으며 모의 결함을 가지는 6.6[kV] 회전기 고정자권선에 적용하여 부분방전펄스를 측정 하였으며 설계된 Probe의 신뢰성을 확인하고자 상용 HFCT센서와 PPM97(Corona Probe)센서를 통하여 검출감도를 비교분석하였다.

  • PDF