• 제목/요약/키워드: hall measurement

검색결과 492건 처리시간 0.033초

Hall Probe를 이용한 초전도선재의 비접촉 임계전류 측정 방법 (Non-contact critical current measurement of superconducting coated conductor using Hall Probe)

  • 김호섭;오상수;이남진;하동우;백승규;고락길;하홍수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 춘계학술대회 논문집
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    • pp.12-12
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    • 2010
  • The hall probe measurement system was used to measure the critical current distribution of superconducting coated conductor. The system consists of reel to reel moving apparatus, 7 array hall probe, a rotary encoder and permanent magnet. The magnetic field profile across the width of superconducting coated conductor using Bean's critical state model was calculated. The effect of various parameters of the formulas on the magnetic field distribution and the effect of shape and size of artificial defects, which were formed on the surface of SmBa2Cu3O7-d(SmBCO) coated conductor using laser marking system, on the hall probe magnetic field signal of the hall probe measurement system was investigated.

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자기베어링 시스템에서의 변위측정을 위한 홀 효과 센서의 기초 연구 (A Basic Study of Displacement Measurement of Magnetic Bearing System Using Hall Effect Sensor)

  • 양주호;정광교;정황훈;손수강
    • 동력기계공학회지
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    • 제11권2호
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    • pp.72-76
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    • 2007
  • Since the magnetic bearing system has unstability inherently it is necessary to measure the displacement for stable operation. Normally the displacement measurement is implemented by using sensors. The sensor for the displacement measurement is selected by precision, installation space, effect of magnetic field and response speed. And the cost of displacement measurement sensor also is considered. At the cost the hall effect sensor has a large advantage comparing with the others. Therefore this study concern about the basis experimental test for the displacement measurement of the magnetic bearing system that uses the hall effect sensor coupled with a tiny permanent magnet. The experimental results confirm the validity and practicability for this displacement measurement sensor.

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Hall probe를 이용한 비접촉 임계전류 측정 (Non-contact critical current measurement using hall probe)

  • 김호섭;이남진;하동우;백승규;김태형;고락길;하홍수;오상수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 춘계학술대회 논문집
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    • pp.7-8
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    • 2009
  • Non-contact critical current measurement apparatus was developed using hall probe which measures the magnetic field distribution across the width of superconducting tape. The hall probe consists of 7 independent hall sensors which lie in a line 600 ${\mu}m$. The difference between maximum and minimum magnetic field in the magnetic filed distribution is a main parameter to determine the critical current. As preliminary research, we calculated the magnetic field intensity at the middle sensor, which is a minimum magnetic field and generated by the circular shielding current modeled by Bean model. We confirmed that there are some parameters that affect on the minimum magnetic field; the distance between superconducting layer and hall sensor, the width of superconducting tape, and the critical current distribution across the width of superconducting tape. Among these parameters, the distance between superconducting layer and hall sensor highly influences on the minimum magnetic field.

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IGZO 박막의 CO2 가스 반응에 대한 안정성 (Stability of Gas Response Characteristics of IGZO)

  • 오 데레
    • 반도체디스플레이기술학회지
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    • 제17권3호
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    • pp.17-20
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    • 2018
  • IGZO thin films were prepared on n-type Si substrates to research the interface characteristics between IGZO and substrate. After the annealing processes, the depletion layer was formed at the interface to make a Schottky contact owing to the electron-hall fair recombination. The carrier density was decreased by the effect of depletion layer and the hall mobility decreased during the deposition processes. But the annealing effect of depletion layer increased the hall mobility because of the increment of potential barrier and the extension of depletion layer. It was confirmed that it is useful to observe the depletion effect and Schottky contact's properties by complementary using the Hall measurement and I-V measurement.

선형 홀센서 기반의 모터 회전속도 측정을 위한 평균 최소 자승 추정기 (Least Mean Square Estimator for Motor Frequency Measurement Based on Linear Hall Sensor)

  • 최가형;나원상;곽기석;윤태성;박진배
    • 전기학회논문지
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    • 제57권5호
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    • pp.866-874
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    • 2008
  • Motor frequency can be measured by a hall sensor. Among the many hall sensors, a linear type hall sensor is good at high accuracy frequency measuring problem. However, in general, this linear type hall sensor has DC offset which can vary along sensor's operating voltage change. Therefore, In motor frequency measurement problem using the linear hall sensor, it needs an estimator that can estimate frequency and DC offset simultaneously. In this paper, we propose the least mean square estimator to estimate motor frequency. To verify its performance, we compare the LMS estimator with a commercial analog tachometer. Experimental results shows the proposed LMS estimator works well in varying frequency and stationary DC offset.

InSb 박막 홀효과의 온도의존성 (Temperature Dependent Hall Effect Characteristics of InSb Thin Film)

  • 이우선;조준호;최권우;김남오;김상용
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 하계학술대회 논문집
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    • pp.21-24
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    • 2000
  • lnSb temperature dependent hall effect of multilayerd structures were investigated. According to variation of magnetic field measured hall coefficient, Hall mobility, carrier density and hall voltage. For the measurement of electrical properties of hall device, evaperated InSb thin film fabricated with series and parallel multilayers. We found that the XRD analysis of InSb thin film showed good properties at 20$0^{\circ}C$, 60 minutes. Resistance of ohmic contact increased linearly due to increasing current. Some of device fabrication technique and analysis of Hall effect were discussed.

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선형홀센서를 이용한 전기식 구동장치의 속도 신호 구현 (A New Velocity Measurement Method using Linear Type Hall-effect Sensor for Electro-mechanical Fin Actuator)

  • 구정회;송치영
    • 전기학회논문지
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    • 제59권1호
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    • pp.70-75
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    • 2010
  • The objective of this paper is to propose a new velocity measurement method for an electro-mechanical fin actuator. The model of the electro-mechanical fin actuator includes uncertainties such as unknown disturbances and parameter variations in flight condition. So, an electro-mechanical fin actuator system needs robust control algorithm which requires not only position information but also velocity information. Usually, analog tachometers have been used for velocity feedback in an electro-mechanical fin actuator. However, using these types of sensors have problems such as the cost, space, and malfunction. These problems lead to propose a new velocity measurement method using linear type Hall-effect sensor. In order to verify the proposed method, several experiments are performed using Model Following Sliding Mode Controller(MFSMC). It is shown that the MFSMC with a new velocity measurement method using linear type Hall-effect sensor can satisfy the requirements without using of velocity sensor.

Development of magnetic field measurement system for AMS cyclotron

  • Ho Namgoong;Hyojeong Choi;Mitra Ghergherehchi;Donghyup Ha;Mustafa Mumyapan;Jong-Seo Chai;Jongchul Lee;Hoseung Song
    • Nuclear Engineering and Technology
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    • 제55권8호
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    • pp.3114-3120
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    • 2023
  • A high-accuracy magnetic field measurement device based on a cyclotron is being developed for accelerator mass spectrometry (AMS). In this study, a magnetic field measurement device consisting of a Hall probe sensor, piezo-motor, and step motor was developed to measure the magnetic field of the AMS cyclotron magnet. The Hall probe sensor was calibrated to achieve positional accuracy by using polar coordinates. The measurement results between the ratchet gear and piezo-motor, which are the instruments used for driving the measurement device, were analyzed. The measurement result of the device with a piezo-motor exhibits a difference of 5 Gauss (0.04%) as compared with the simulation result.

황룡사 가람계획 척도 연구 (A Study on the Units of Measuring Scale in Hwangnyongsa Temple Planning)

  • 김숙경
    • 건축역사연구
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    • 제25권4호
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    • pp.65-73
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    • 2016
  • This paper aimed to identify the units of measuring scale in Hwangnyongsa temple planning with the published excavation survey reports. Hwangyongsa temple site was planned under Silla Capital's urban planning in 6~7C, its full size was $800{\times}800$, and main temple was $400{\times}515$ of Goguryeo's system of measurement. Main hall was located in the center of Hwangnyongsa temple site, and its location could be seen that there was the arrangement of main temple divided into 3 : 2. Building plan measuring units proved to be 351~356mm and 294~ 296mm by analyzing measured data of remains. Lecture hall and Wooden pagoda were rebuilt by using the ancestors' units of measuring scale again and Bell hall was not planned by Tang's system of measurement in middle of 8C. In this respect, it would be important to have a deliberate attitude and lay down stereotypes on research of the units of measuring scale in ancient architecture.

마이크로파를 이용하여 반도체내의 Hall에 의한 이동도측정방법 (On the Method of Measuring the Mobility using the Microwave by the Hall Effect in the semiconductor)

  • 허영남
    • 한국통신학회논문지
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    • 제8권2호
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    • pp.54-62
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    • 1983
  • The electric characteristics of semiconductor materials can be found by way of various methods, of which the measurement of the carrier mobility is thought to be of great importance. There exist some mobilty measurements, but the measurement based on Hall effect is the most widely uesd. In this paper is adopted the mobility measurement of semiconductor by the use of cylindrical eavity operated in the same shape as TE modes. It is hoped that the resultant values of measurement, the structure of measurement circut, cavity design and the raising of relevant problems may give much help to those who may interested in this field.

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