• Title/Summary/Keyword: Capacitance measurement method

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Direct Measurement of the VLSI Interconnection Line Capacitances Using a Grounded Shield Plate (접지된 Shield Plate를 이용한 집적회로의 배선용량 측정)

  • 강래구;전성오;신윤승
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.25 no.3
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    • pp.302-307
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    • 1988
  • A noble interconnection line capacitance measurement method to be able to remove the measurement errors from the probe pad to substrate stray capacitance has been proposed and verified. The measurement errors in the capacitance measurement, which usually be involved from the probe pad to substrate stray capacitance, can easily be removed by isolating the metal probe pad from the substrate with a grounded shield plate between the probe pad the substrate. The measurement results by using this improved capacitance measurement method were compared with the calculations by two-dimensional computer simulations.

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Precise Measurement of Dielectric Constant Using Cross Capacitance Measurement Method (Cross Capacitance 측정법을 이용한 유전상수 정밀측정)

  • Kim, Han-Jun;Kang, Jeon-Hong;Yu, Kwang-Min;Lee, Sei-Hyun;Koo, Kyung-Wan;Han, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1287-1288
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    • 2007
  • The cross capacitor electrode system applied Thompson-Lampard theorem for precise and accurate measurement of dielectric constants is studied in this study. The capacitance derived from cross capacitor is calculated by the equation of ($C=\frac{{\epsilon}ln2}{\pi}{\cdot}$ effectivelength of electrode) which is very different from the equation of capacitance derived from parallel plate capacitor. From above mentioned reason, the capacitance measurement uncertainty of cross capacitor can be reduced then that of the parallel plate capacitor. the measurement dielectric constant measured by cross capacitor electrode method is one order more accurate and precise than that of 3-electrode method.

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A Study on Influencing Factors of Unit-Water Measurement method according to Electrostatic capacity (정전용량에 따른 단위수량 측정기법의 영향인자에 대한 실험적 연구)

  • We, Joon-Woo;Lee, Young-Jin;Kim, Jeong-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.232-233
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    • 2013
  • The unit-water content in fresh concrete determines consistency, and play an important role in condensing the structure of concrete and enhancing the durability of concrete. The capacitance measurement method measure quickly unit-water content and is the best way to apply to construction site. In this study, the unit-water content of capacitance measurement method is estimated according to types and replacemment ratio of admixture. and the field application of capacitance measurement method is reviewed.

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A New Measurement Method of Dielectric Constants Applied the Principles of Cross Capacitance (Cross Capacitance 원리를 작용한 새로운 유전상수 측정방법 제안)

  • Kim, Han-Jun;Lee, Rae-Duk;Kang, Jeon-Hong;Yu, Kwang-Min;Han, Sang-Ok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.1084-1087
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    • 2002
  • The guard-ring type 3-terminal parallel plate electrodes proposed by ASTM D 150-81 and IEC 250 have been widely used for measurement of dielectric constants of solid dielectrics. However the method using this electrodes causes many uncertainty associated with the measurement errors of the diameter of the guarded electrode. the gap between guarded and guard-ring electrode. the distance of two active electrodes(the thickness of specimen), the roughness and contamination of surface of electrode and specimen. close adherence grade of electrode and specimen. In this paper. a new electrode system of cross capacitance type based on Thompson-Lampard theorem is designed and is employed for the measurement of dielectric constant. The results of simulation of guard-ring electrode and cross capacitance electrode using FEM program show that distance measurement between two electrodes in guard-ring electrode produces large uncertainty. on the other hand this effect in cross capacitance electrode is negligible. Furthermore. the air gap effects in the cross capacitance electrode is 5.6 times less sensitive than that in guard-ring electrode by assuming air gap of $50{\mu}m$.

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Performance Improvement of Digital Capacitance Measurement System using Voting Method (Voting 기법을 이용한 디지털 정전용량 계측 시스템에서의 성능 개선)

  • Lee, Won-Kyung;Shin, Doo-Jin;Huh, Uk-Youl
    • Proceedings of the KIEE Conference
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    • 1999.11c
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    • pp.482-484
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    • 1999
  • In this paper, we propose a voting method for capacitance measurement. Nowadays the measurement system is changing from analog system to digital system. However, capacitance measurement system has a data error because of the noise. The data of general digital measurement system include an internal and external measurement noises that highly affect to the results. Therefore, this paper proposes data compensation method using voting method. Finally, simulation results are used to demonstrate the efficiency of the proposed method.

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A Study for Implementation of Density Measurement Equipment for Asphalt Pavement based on the electromagnetic capacitance

  • Park, Young-Ho;Kim, Gun-Kyun;Nor, Jeong-Keun;Ha, Jae-Kwon
    • International Journal of Contents
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    • v.6 no.4
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    • pp.39-42
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    • 2010
  • In this paper we developed density measurement equipment for Asphalt Pavement based on the electromagnetic capacitance. This kind of Non-Nuclear Density Gauges technology and products is used or studied in USA, Finland, Sweden as standardization of authorized method for pavement density measurement. Effective permitivity of pavement asphalt is characterized in electromagnetic capacitance by the asphalt material, mixed ratio, and harden grade of pavement asphalt. We can get a density value of asphalt by replacing value of electromagnetic capacitance with standard density value and characteristic transformation curve. We are conformed that measurement data according to temperature, humidity, and real field asphalt of our density measurement equipment can be a precise value.

The thermal effect on electrical capacitance sensor for two-phase flow monitoring

  • Altabey, Wael A.
    • Structural Monitoring and Maintenance
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    • v.3 no.4
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    • pp.335-347
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    • 2016
  • One of major errors in flow rate measurement for two-phase flow using an Electrical Capacitance Sensor (ECS) concerns sensor sensitivity under temperature raise. The thermal effect on electrical capacitance sensor (ECS) system for air-water two-phase flow monitoring include sensor sensitivity, capacitance measurements, capacitance change and node potential distribution is reported in this paper. The rules of 12-electrode sensor parameters such as capacitance, capacitance change, and change rate of capacitance and sensitivity map the basis of Air-water two-phase flow permittivity distribution and temperature raise are discussed by ANSYS and MATLAB, which are combined to simulate sensor characteristic. The cross-sectional void fraction as a function of temperature is determined from the scripting capabilities in ANSYS simulation. The results show that the temperature raise had a detrimental effect on the electrodes sensitivity and sensitive domain of electrodes. The FE results are in excellent agreement with an experimental result available in the literature, thus validating the accuracy and reliability of the proposed flow rate measurement system.

Improvement the Junction Temperature Measurement System Considering the Parasitic Capacitance in LED (LED 기생 커패시턴스를 고려한 접합온도 측정 시스템의 개선)

  • Park, Chong-Yun;Yoo, Jin-Wan
    • Journal of Industrial Technology
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    • v.29 no.B
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    • pp.187-191
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    • 2009
  • Recently, we have used LEDs to illumination because it has a high luminous efficiency and prolong lifespan. However the light power and lifetime is reduced by junction temperature increment of LED. So it is important to measure the junction temperature accurately. In case of using a electrical method measuring junction temperature of LED. Temperature measurement errors are spontaneously generated because of a parasitic capacitances in LED. In this paper, we proposed a method that reducing LED's parasitic capacitance effects for electrical measurement. It was demonstrated by the experimental result that is more correct than established method.

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Capacitive Touch Switch Regardless of Operating Frequency Using a Switched-Capacitor (스위치드 커패시터를 이용한 동작 주파수에 무관한 정전용량 터치스위치)

  • Lee, Mu-Jin;Seong, Kwang-Su
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.6
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    • pp.88-94
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    • 2013
  • This paper proposes a capacitive touch switch using a switched-capacitor. The proposed method charges capacitance for measurement using the switched-capacitor until the voltage across the capacitance reaches a threshold voltage. As the proposed method uses the number of times being charged to measure the capacitance, the method has no relation with the operating frequency of the switched-capacitor. This paper also shows the quantization resolution of the proposed method is related to the capacitance in the switched-capacitor and the threshold voltage, i.e., the resolution is improved when the capacitance in the switched-capacitor is decreased and the threshold voltage is increased. Simulation result shows the method gives 31fF quantization resolution when the capacitance in the switched-capacitor is 50fF and threshold voltage is 80% of the supply voltage.

Measurement of Ratio Error/Phase Angle Error of Potential Transformer using High Voltage Capacitance Bridge and Uncertainty Analysis (고전압 전기용량 브리지를 이용한 전압변성기의 비오차와 위상각 오차의 측정과 불확도 분석)

  • Kwon, Sung-Won;Lee, Sang-Hwa;Kim, Myung-Soo;Jung, Jae-Kap
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.3
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    • pp.134-141
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    • 2006
  • A potential transformer(PT) has ratio error and phase angle error. Precise measurement of the errors of PT can be achieved using high voltage capacitance bridge, high voltage capacitor and low voltage capacitor. The uncertainty for this method is evaluated and found to be $20{\times}10^{-6}$ in both ratio error and phase angle error. The values measured for PT using the method are well consistent with the those measured for same PT in NMIA(National Measurement Institute of Australia) within the corresponding uncertainty.