• 제목/요약/키워드: Simultaneous measurement

검색결과 482건 처리시간 0.037초

Simultaneous Multi-Channel Sensor System for Gas Flow Measurementtion Measurement

  • Kim, Young-Han;Joung, Ok-Jin
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2002년도 ICCAS
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    • pp.95.3-95
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    • 2002
  • A multi-channel electrostatic probe is utilized to determine gas flow rate in a cylindrical container. A numerical analysis is conducted to compare experimental measurement with the computed gas velocity in radial and axial directions.

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폴리머 코팅된 측면 연마 단주기 격자 기반 외부 굴절률 및 온도 동시 측정 센서 연구 (Simultaneous Measurement of External Refractive Index and Temperature by Using a Side-polished Fiber Bragg Grating with a Polymer Overlay)

  • 김현주;전나람;이상배;한영근
    • 한국광학회지
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    • 제21권5호
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    • pp.190-194
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    • 2010
  • 본 연구에서는 측면연마 된 광섬유 브래그 격자를 측면 연마하고 폴리머 상부층(overlay)를 형성시켜 외부 굴절률과 온도를 동시 측정할 수 있는 광섬유 센서 소자를 제안하였다. 외부굴절률 변화에 민감하지 않는 광섬유 브래그 격자를 이용하여 온도를 측정하고 격자를 측면 연마한 후 폴리머 코팅에 의해 소산장 결합을 유도하여 외부 굴절률 변화를 측정하게 된다. 측면 연마된 광섬유 브래그 격자의 온도 민감도는 0.01 nm/oC로 측정되었고 폴리머 상부층의 온도 민감도는 -0.58 nm/oC로 측정되었고 선형구간 별(1.33-1.39, 1.39-1.42, 1.42-1.44) 굴절률 민감도는 498.8 nm/RIU, 694.9 nm/RIU, 1312 nm/RIU로 측정되었다.

감쇄필터를 이용한 갑상선섭취율 측정과 갑상선스캔의 동시검사법 연구 (The Research on the Simultaneous Examination of Thyroid Uptake Measurement and Thyroid Scan using Attenuation Filter)

  • 이효영;김종언;임인철
    • 한국방사선학회논문지
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    • 제5권6호
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    • pp.309-313
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    • 2011
  • 과산화테크네슘($^{99m}Tc$-pertechnetate)을 이용한 갑상선 검사에서 갑상선 섭취율 측정과 갑상선 스캔을 위해 두 번의 정맥주사와 두 번의 대기시간이 필요하다. 이를 해결하기 위해 감쇄필터(Attenuation Filter)를 이용하여 과산화테그네슘($^{99m}Tc$-pertechnetate)의 1회 정맥주사로 갑상선 섭취율과 스캔을 동시검사 할 수 있는 방법을 연구하고자 하였다. 그에 따른 결과로는 감쇄필터를 사용하지 않은 그룹과 사용한 그룹간의 유의한 상관관계로 나타났다. 따라서 1회 주사를 통한 갑상선 섭취율 측정과 스캔을 동시에 할 수 있게 되어 임상에서 많이 활용될 것으로 사료된다.

5 축 동시 구동을 통한 볼바 측정용 원추형 경로 생성 방법 (Conical Path Generation Technique for Ball Bar Measurement Using Simultaneous 5-Axis Motion Control)

  • 이동목;이재창;양승한
    • 대한기계학회논문집A
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    • 제37권1호
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    • pp.97-103
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    • 2013
  • 본 연구는 원추대 가공과 등가인 동시 5 축 구동을 통한 볼바 측정용 경로 생성 기법을 소개하며 시스템 구조 형태(Structural configuration)에 관계없이 모든 5 축 공작기계에 대해 적용 가능한 일반화된 방법을 제시한다. 5 축 공작기계 시스템 정보와 원추형 정보, 그리고 볼바 측정 정보 등을 입력 받아 NC 코드 생성, 다양한 오차 평가 시뮬레이션 및 측정 시험을 쉽게 수행할 수 있도록 원호 경로 생성에 필요한 수학적 기계 입력 모델을 제시한다. 또한 제시된 원추형 경로 모델을 토대로 5 축 동시 구동 시 회전축의 이송 범위를 수학적으로 검토하며 반꼭지각 및 기울기각의 크기 차이, 볼바 틸팅 허용각 및 워크피스 볼의 오프셋 위치 등 여러 가지 조건이 이송 범위에 미치는 영향에 대해 분석한다.

수전달 진동평가량의 랜덤오차 저감을 위한 공구 핸들에서의 진동과 작용력의 동시 측정 (Simultaneous Measurement of Vibration and Applied Forces at a Power Tool Handle for the Reduction of Random Error When valuating Hand-transmitted Vibration)

  • 최석현;장한기;박태원
    • 한국소음진동공학회논문집
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    • 제15권4호
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    • pp.404-411
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    • 2005
  • To increase accurateness and reliability of the evaluation of power tool vibration transmitted to an operator, it is necessary to measure the grip and feed forces during the measurement of hand-transmitted vibration. In the study a system was invented to measure the vibration and the grip and/or feed force, which consists of a measurement handle and a PC with a data acquisition system and the corresponding software. Strain gauges and an accelerometer were mounted on the handle surface for the simultaneous measurement of the forces and the vibration. The program in the system makes it possible to monitor the grip and feed force during the tool operation so that the operator keeps the applying forces within the pre-determined range. Investigating the vibration total values, frequency-weighted root-mean-square accelerations at the handle, obtained in repetition for each power tool with control of the grip and feed force showed more consistency than those measured without force control. By using the system the experimenter can reduce random error of the measured vibration.

수전달 진동 평가를 위한 공구 핸들에서의 진동과 작용력의 동시 측정 (The Simultaneous Measurement of Vibration and Applied forces at a Power tool handle for the Evaluation of Hand-transmitted Vibration)

  • 최석현;장한기;박태원
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2004년도 추계학술대회논문집
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    • pp.689-694
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    • 2004
  • To increase accurateness and reliability of the evaluation of power tool vibration transmitted to an operator, it is necessary to measure grip and feed forces during the measurement of hand-transmitted vibration. In the study a system was invented to measure the vibration and the grip and/or feed force, which consists of a measurement handle and a PC with data acquisition system and the software. Strain gauges and an accelerometer were mounted on the handle for the simultaneous measurement of the forces and the vibration. The program in the system makes it possible to monitor the grip and feed force during the tool operation so that the operator keeps the applying forces within the pre-determined range. Investigating the vibration total values, frequency-weighted root mean square accelerations at the handle, obtained at various conditions with control of the grip and feed force showed more consistency than those measured without force control. By using the system the experimenter can reduce uncertainty of the measured vibration.

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복합재 주 날개 모델의 변형률과 진동의 동시 측정 (Simultaneous Measurement of Strain and High Frequency Vibration of Composite Main Wing Model)

  • 송지용;윤혁진;박상욱;박상오;김천곤
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2005년도 추계학술발표대회 논문집
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    • pp.185-189
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    • 2005
  • For the simultaneous measurement of strain and vibration signal, a fiber Bragg grating sensor system with a dual demodulator was proposed. One demodulator using a tunable Fabry-Perot filter could measure low-frequency signal such as strain and the other demodulator using a coarse wavelength division multiplexer could detect high-frequency signal such as vibration signal using intensity demodulation method. In order to measure strain and vibration of the composite main wing model under static loading a real time monitoring program was developed. Also using intensity demodulation of CWDM, sensitivity and resolution at high frequency vibration were evaluated.

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속도/농도 동시측정에 의한 회전교반기 내부 유동의 baffle 효과에 관한 연구 (A Study on the baffle effect in a stirred mixer using simultaneous measurement of velocity/concentration fields)

  • 김윤기;민영욱;김경천
    • 한국가시화정보학회:학술대회논문집
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    • 한국가시화정보학회 2003년도 추계학술대회 논문집
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    • pp.35-38
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    • 2003
  • Simultaneous measurement of velocity and concentration fields in a stirred mixer flow using a combined Stereo-PIV/Planar-LIF technique is carried out. Instantaneous velocity fields and concentration fields represent the local flow characteristics. A baffle is perpendicularly attached to the Wall to remove inactive region which shows very slow dispersion. It is found that the baffle produces tip vortex and breaking the divided streamline, so that mixing efficiency could be increases significantly.

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대기오염도 실측에 의한 대기오염 자동측정망의 대표성 평가 (Evaluation of the Representativeness of Air Quality Monitoring Network in Seoul through Actual Measurement)

  • 전의찬
    • 환경영향평가
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    • 제5권1호
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    • pp.79-85
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    • 1996
  • Simultaneous monitoring in many locations is necessary to evaluate the air quality and analyze future trend of a city, For this purpose, it is essential to install air pollution monitoring network. The first automatic air pollution monitoring network was introduced Seoul in 1973. As of 1995, 20 monitoring stations are now in operation. Concerning the management of the air pollution monitoring network, there was some argument among the relavant scholars, non-governmental organization(NGO) and the government organization. So far, there was no extensive evaluation and analysis about the network. The purpose of this study was to evaluate the representativeness of air quality monitoring network through actual measurement of the concentration of the air pollutant. The concentration of NOx was extensively measured widely in Seoul area three times using the TEA simple measuring technique. Even the judgement level for the area representativeness was lowered to 80%, Ssangmun-dong monitoring station tend to overestimate the pollutant concentration of the covered area. While, Sinlimdong monitoring station tend to underestimate the pollutant concentration of the covered area.

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광섬유 브래그 격자가 포함된 측면 연마된 광섬유를 이용한 매질의 온도와 굴절률 동시 측정 (Simultaneous Measurement of Temperature and Refractive Index of a Medium Using by a Side-Polished Fiber Containing a Fiber Bragg Grating)

  • 김광택
    • 한국전기전자재료학회논문지
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    • 제28권8호
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    • pp.513-517
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    • 2015
  • We proposed and demonstrated a simultaneous measurement method to detect the refractive index and temperature of a medium using a side-polished fiber involving FBG (fiber Bragg grating). The temperature of a medium was obtained by using the Bragg wavelength shift of FBG, while the refractive index of medium were calculated by using the transmission loss. The Bragg wavelength is independent on the refractive index of the covering medium placed on surface of side-polished fiber, while the transmission loss at off-Bragg wavelength highly depends on the environmental temperature because of thermo-optic effect of the medium.