• Title, Summary, Keyword: Electric probe

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Design Models for Electric Coupling Probe in Combline Resonators Using Neural Network (신경망을 이용한 Combline 공진기 내의 전계결합 프로브 설계 모델)

  • 김병욱;김영수
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.366-369
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    • 2002
  • Two artificial neural networks (ANN) are used to model the electric coupling probe in the combline resonators. One is used to analyze and synthesize the electric probe, and the other is used to correct errors between the results of the analysis and the synthesis ANNs and the fabrication results. The ANNs for the analysis and the synthesis of the electric probe are trained using the physical dimensions of the electric probe and the corresponding coupling bandwidth which is obtained using the finite element method. The ANNs for the error correction are trained using a very small set of the measurement results. Once trained, the ANN models provide the correct result approaching the accuracy of the measurement. The results from the ANN models show fairly good agreement with those of the measurement and they can be used as good initial design values.

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Eddy Current Testing of Weldment by Plus(+) Point Probe (Plus(+) Point Probe를 이용한 용접부 와전류검사)

  • Lee, Hee-Jong;Kim, Yong-Sik;Nam, Mim-Woo;Yoon, Byung-Sik;Kim, Seok-Kon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.19 no.6
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    • pp.426-432
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    • 1999
  • A plus-point eddy current test(ECT) probe was developed to examine the defects on the welds of pumps, valves, and pipings which are the major components of the electric power plants, non-destructive evaluation (NDE) techniques for detecting and sizing the flaws were studied adapting this probe. Differential plus-point ECT probe is consists of two "I"-type coils crossed each other and has an advantage having a small influence on the sensitivity by lift-off variation to the conventional types of probe. The specimens with crack-like electro discharge machining(EDM) notches on the weld of type 304 stainless-steel were fabricated in order to evaluate the plus-point ECT probe response to the flaws. NDE techniques to detect and size the flaws and estimate the flaw type were established with this specimens.

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Design and Fabrication of an Electric-Field Probe Using Short Dipole Antennas (소형 이극안테나를 이용한 전계강도 프로브의 설계 및 제작)

  • 김혁제;박동철;이애경;심환우
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.6 no.1
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    • pp.3-9
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    • 1995
  • An isotropic electric-field probe, capable of characterizing and quantifying electromagnetic field, was fabricated. The probe consists of three short dipole antennas, a beam-lead Schottky diode and the high resistive transmission line. In order to get the isotropic response three mutually orthogonal dipoles are configured to form the probe. The probe's short dipole elements allow measurements of electric fields from 300MHz to 2GHz with a flatness of .+-. 2.9dB. The mutually orthogonal dipole configration shows a .+-. 1.2dB deviation in the isotropic response with respect to angle.

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On the deduction of electron temperature by various electric probes in RF plasma (다양한 전기탐침을 이용한 RF 플라즈마 전자온도의 측정)

  • Seo, V.J.;Woo, H.J.;Choe, G.S.;You, H.J.;Lho, T.;Chung, K.S.
    • Proceedings of the KIEE Conference
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    • pp.1568-1569
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    • 2006
  • An electric probe is a conductor inserted into the plasma, by which plasma density and electron temperature can be deduced from the collected current (I) versus applied voltage (V) to the probe. In RF plasma the I-V characteristics of electric probe is distorted due to the RF fluctuation of plasma potential, so that it is hard to measure the real plasma parameters, especially the electron temperature. To eliminate the RF fluctuation, several compensation methods are developed such as RF compensation probe, peak-to-peak method, asymmetric double probe. By comparing proposed methods, a suitable method is to be introduced in determining electron temperatures in RF plasma.

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Comparison Study about Surface Mapping of Motor Points in Biceps Brachii Muscle Using Surface EMG and Electric Probe (표면 근전도와 전기 탐침기를 이용한 상완이두근의 운동점 표지 비교 연구)

  • Park, Jaewon;Keum, Dongho
    • Journal of Korean Medicine Rehabilitation
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    • v.28 no.1
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    • pp.85-96
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    • 2018
  • Objectives This study was performed to compare the electrical methods of motor points mapping using surface EMG and electric probe (Pointer Excel II). Methods 32 healthy adults (male 16, female 16) were selected. and classified into two groups; surface EMG group, electric probe (Pointer Excel II) group. In surface EMG group, motor points were searched by recoding the compound muscle potentials. In electric probe (Pointer Excel II) group, motor points were searched by scanning the skin with Pointer Excel II at low level stimulation. The locations of the motor points were expressed as X and Y values in relation to the reference line. The horizontal reference line was set as elbow crease and the vertical reference line was set as the line connecting coracoid process to the center of the horizontal reference line. The data was analyzed by 'Independent T-test' and 'equivalence test'. Results 1. The motor points of short head and long head of biceps brachii muscle were located at about 2/3 length of the vertical reference line from coracoid process and about 1/5~1/4 length of the half of the horizontal reference line from the vertical reference line in both group. 2. The motor points of the short head were located more distally and close to the vertical reference line (p<0.001). 3. In surface EMG group, the motor points of the long head were located more laterally in the female than male. And the motor points of the long head were located more distally in the left side than right side (p<0.05). In electric probe (Pointer Excel II) group, similar tendency was observed but there was no statistically significant difference (p>0.05). 4. As a result of the equivalence test between surface EMG group and electric probe (Pointer Excel II) group, the confidence intervals of the difference were within the equivalence limit. Therefore, the locations of the motor points searched by two ways are equa l (p>0.05, equivalence interval=3%). Conclusions The results indicate that electric probe (Pointer Excel II) can be used to search the motor points instead of surface EMG. This might improve the clinical efficiency when using the motor points to treat muscle dysfunction.

Eddy Current Bobbin Probe Design for Steam Generator Tubes in NPPs (원전 증기발생기 전열관 와전류검사 보빈탐촉자 설계)

  • Nam, Min-Woo;Lee, Hee-Jong;Jee, Dong-Hyun;Jung, Jee-Hong;Kim, Cheol-Gi
    • Journal of the Korean Society for Nondestructive Testing
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    • v.27 no.2
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    • pp.89-96
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    • 2007
  • The bobbin probe examination is basic and the important method among other ECT techniques for the steam generator tube integrity assesment that is practiced during each plant outage. The bobbin probe is one of the essential components which consist of the whole ECT examination system, and provides us a decisive data for the evaluation of tube integrity in compliance with acceptance criteria described in specific procedures. The selection of examination probe is especially important because the quality of acquired ECT data is determined by the probe design characteristics, such as geometry and operation frequency, and has enormous effects on examination results. In this study, An optimal differential bobbin probe is designed for the steam generator tube inspection in nuclear power plants(NPPs). Based on the test results for electrical and ECT signal characteristics, the prototype bobbin probe satisfies all the criteria.

3-Axial Isotropic Electric-Field Probe Design with Resistor-Loaded Short Dipole (저항 부하된 소형 다이폴을 이용한 3축 등방성 전기장 프로브 설계)

  • Moon, Sung-Won;Jang, Byung-Jun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.3
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    • pp.246-249
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    • 2017
  • In this paper, we designed the 3-axis isotropic electric-field measurement probe using resistor-loaded short dipole with lumped chip resistors. The designed probe shows good isotropic characteristics as well as wideband and low sensitivity. The isotropic characteristics of ${\pm}0.39dB$ from 100 kHz to the 3 GHz band were derived and the reception sensitivity was 0.1 V/m. The frequency response is within 3 dB of the whole section, especially ${\pm}1.3dB$ from 150 kHz to 3 GHz, which is superior to the conventional electric field probe with short dipoles.

Developments of Low Frequency Electric Field Sensor using $Ti:LiMbO_3$ Optical Modulator ($Ti:LiMbO_3$ 광변조기를 이용한 저주파 전계센서의 개발)

  • Choi, Young-Kyu
    • Journal of Sensor Science and Technology
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    • v.10 no.4
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    • pp.214-221
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    • 2001
  • The use of an asymmetric Mach-Zehnder interferometric amplitude modulator to measure a relatively low frequency electric field strength is described. The sensitivity of an electric field sensor using a $Ti:LiMbO_3$ optical modulator is strongly affected by the shape of a electrode(probe antenna). To measure the low frequency electric field, a probe antenna of wide effective area is more useful than the usual dipole antenna. As a proof of this, the optical modulator was fabricated with a plate-type probe antenna and the usefulness of this antenna tested for measuring low frequency electric field strength. Measurements were performed in the range 0.1 V/cm to 60 V/cm at 60Hz through 100 kHz. Using a probe antenna of $10\;mm{\times}10\;mm$, the output voltage of $10^{-2}\;mV$ was measured with respect to the electric field strength of 0.1 V/cm at 60 Hz. By increasing the effective area of the probe antenna, better sensitivity is obtainable over the measured range.

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