• Title/Summary/Keyword: Distance Measuring System

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A Study on the Tank Monitoring System Using FM-CW (FM-CW파를 이용한 탱크 모니터링 시스템에 관한 연구)

  • 강동균;박규식;김동일
    • Journal of the Korean Institute of Navigation
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    • v.19 no.2
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    • pp.115-120
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    • 1995
  • Recently, the ship automation technology(SAT) has received great attention for the efficient management of the ship with minimum human efforts. Among the SAT, a distance measuring system, the key element is the signal processing unit for the interpretion of the received signal from the remote sensing of the oil tank. In this paper, the tank monitoring system using FM-CW is described for the oil tank level guage measurement with an emphsis of signal processing unit.

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A Study of the Optical System of a Time-of-flight Laser Distance Sensor for a Long Distance with Minimized Divergence Beam Angle (빔 확산각 최소화를 통한 장거리 측정용 ToF 레이저 거리센서 광학계 설계 연구)

  • Lee, Hyun-Hwa;Seo, Jae-Yeong;Jung, Mee-Suk
    • Korean Journal of Optics and Photonics
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    • v.32 no.2
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    • pp.79-85
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    • 2021
  • In this paper, a study is conducted on the design of an optical system of a time-of-flight (TOF) laser distance sensor that can measure long distances by minimizing beam divergence. When measuring a long distance, the amount of light on the object's surface decreases as the distance increases, due to the diffusion angle of the laser beam, and thus the beam at the sensor also decreases, causing measurement errors. In general, a cylindrical lens is used to reduce the divergence beam angle. However, an optical system using a cylindrical lens has the problem of degraded performance due to the difficulty with assembly tolerance, as well as the problem of the increased size of the optical system, and thus the use of aspherical lenses has been increasing recently. Therefore, in this study, the optical efficiencies and assembly tolerances of optical systems using respectively a cylindrical lens and an aspherical lens are compared and analyzed.

Influencing Factors on Dynamic Characteristics of Pantograph of Korean High Speed Train

  • Eom, Beom-Gyu;Mok, Jin-Yong;Lee, Hi-Sung
    • International Journal of Railway
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    • v.2 no.4
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    • pp.187-192
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    • 2009
  • Running test of the Korean High-Speed Train using remote controlled measuring system have been executed on the high speed track in order to evaluate and verify the performance of the train. In this paper, influencing factors on the contact force which represents dynamic characteristics between the pantograph and contact wire are analyzed, according to the track condition, span type and running condition. By the analytical study on the test data, we figured out that contact force and dynamic characteristics of the pantograph are mainly affected by running behavior of the train and the span distance which the train passes.

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Assessment and Reliability Validation of Lane Departure Assistance System Based on DGPS-GIS Using Camera Vision (카메라영상에 의한 DGPS-GIS기반 차선변경 지원시스템의 평가 및 신뢰성 검증)

  • Moon, Sangchan;Lee, Soon-Geul;Kim, Minwoo;Joo, Dani
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.6
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    • pp.49-58
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    • 2014
  • This paper proposes a new assessment and reliability validation method of Lane Departure Assistance System based on DGPS-GIS by measuring lanes with camera vision. Assessment of lane departure is performed with yaw speed measurement and determination method for false alarm of ISO 17361 and performance validation is executed after generating departure warning boundary line by considering deviation error of LDAS using DGPS. Distance between the wheel and the lane is obtained through line abstraction using Hough transformation of the lane image with camera vision. Evaluation validation is obtained by comparing this value with the distance obtained with LDAS. The experimental result shows that the error of the extracted distance of the LDAS is within 5 cm. Also it proves performance of LDAS based on DGPS-GIS and assures effectiveness of the proposed validation method for system reliability using camera vision.

Three-Dimensional Location Tracking System for Automatic Landing of an Unmanned Helicopter (무인 헬기 자동 착륙을 위한 3차원 위치 추적 시스템)

  • Choo, Young-Yeol;Kang, Seong-Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.6
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    • pp.608-614
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    • 2008
  • This paper describes a location tracking system to guide landing process of an Unmanned Helicopter(UMH) exploiting MIT Cricket nodes. For automatic landing of a UMH, a precise positioning system is indispensable. However, GPS(Global Positioning System) is inadequate for tracking the three dimensional position of a UMH because of large positioning errors. The Cricket systems use Time-Difference-of-Arrival(TDoA) method with ultrasonic and RF(Radio Frequency) signals to measure distances. They operate in passive mode in that a listener attached to a moving device receives distance signals from several beacons located at fixed points on ground. Inevitably, this passive type of implementation causes large disturbances in measuring distances between beacons and the listener due to wind blow from propeller and turbulence of UMH body. To cope with this problem, we proposed active type of implementation for positioning a UMH. In this implementation, a beacon is set up at UMH body and four listeners are located at ground area at least where the UMH will land. A pair of Ultrasonic and RF signals from the beacon arrives at several listeners to calculate the position of the UMH. The distance signals among listeners are synchronized with a counter value appended to each distance signals from the beacon.

UV Detecting according to Corona Discharge Intensity using UV Sensor (자외선 센서를 이용한 코로나 방전 강도에 따른 자외선 검출)

  • Kwag, Dong-Soon;Kim, Young-Seok
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.3
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    • pp.78-83
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    • 2014
  • To minimize the financial loss due to power facility malfunction, on-line diagnostic techniques are required to grasp any abnormal state of facilities in the live line as well as devices to diagnose abnormal states of power facility in an easy and prompt manner. This study aims to develop a portable UV detecting system by means of UV sensors for easier and efficient inspection of the degradation state of power facility in a long distance. Accordingly, it includes a simulation of corona discharges that may occur due to degradation of power facility and detection of ultraviolet pulse generation depending on the corona discharge intensity and measuring distance in application of UV sensors. Additionally, the optimal algorithm is determined for its application to the system's degradation diagnosis program based on the measured experiment data.

Recognition of contact surfaces using optical tactile and F/T sensors integrated by fuzzy fusion algorithm (광촉각 센서와 힘/역학센서의 퍼지융합을 통한 접촉면의 인식)

  • 고동환;한헌수
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.628-631
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    • 1996
  • This paper proposes a surface recognition algorithm which determines the types of contact surfaces by fusing the information collected by the multisensor system, consisted of the optical tactile and force/torque sensors. Since the image shape measured by the optical tactile sensor system, which is used for determining the surface type, varies depending on the forces provided at the measuring moment, the force information measured by the f/t sensor takes an important role. In this paper, an image contour is represented by the long and short axes and they are fuzzified individually by the membership function formulated by observing the variation of the lengths of the long and short axes depending on the provided force. The fuzzified values of the long and short axes are fused using the average Minkowski's distance. Compared to the case where only the contour information is used, the proposed algorithm has shown about 14% of enhancement in the recognition ratio. Especially, when imposing the optimal force determined by the experiments, the recognition ratio has been measured over 91%.

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On the use of an acoustic sensor for measuring the level of a zinc pot (용융아연욕 탕면 높이 측정을 위한 초음파 센서의 사용에 관하여)

  • 박상덕;임태균;이옥산
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.836-839
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    • 1996
  • Throughout CGL (Continuous Galvanizing Line) in steel works, zinc-coated steel sheets are produced which are used where long-running corrosion resistivity is required. During the galvanizing process, top dross is created and floated on the zinc pot. Because the dross leaves ill patterns on the coated sheets, a robot system is developed to automatically collect and remove the top dross. It consists of a robot and its carriage system, a pot level sensor, a system controller, and special robot tools. For the first time the level of zinc pot must be measured and fed back to the robot controller to avoid submersion of the robot hand into the hot zinc pot. In this paper, acoustic distance sensor is tested as a candidate for the pot level sensor in the view point of hot environment. Some considerations on the use of the acoustic distance sensor will be denoted.

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Analysis of Jet-drop Distance from the Multi Opening Slots of Forced-ventilation Broiler House (강제 환기식 육계사 다중 입기 슬롯에서의 입기류 도달거리 분석)

  • Kwon, Kyeong-Seok;Ha, Tae-Hwan;Lee, In-Bok;Hong, Se-Woon;Seo, Il-Hwan;Jessie, P. Bitog
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.2
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    • pp.55-65
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    • 2012
  • In the winter season, when the ventilation system is operating, the fresh cold air from the slot-type openings of broiler house which directly reached the animal zone can cause various problems such as thermal stress, decreasing of feed and water consumption, occurrence of respiratory disease, and etc. Therefore it is very important to control the trajectory of aero-flow from the slot openings to induce an efficient thermal heat change. Jet-drop distance model was proposed to predict and control the jet-trajectory. However their study was restricted due to the small scaled model and difficulties of measuring the Jet-drop distance. In this study, CFD was applied to analyze qualitatively and quantitatively the jet-drop distance in a real broiler house. The various variables were considered such as installed slot-angle, designed ventilation rate, and the outdoor ambient temperature. From the present study, two linear-regression models using the Jet-drop factor and corrected Archimedes number, and their R-squared values 0.744 and 0.736, respectively, were used. From this study, the applicability of CFD on the analysis of Jet-drop distance model was confirmed.

Pad Surface Characteristics and their Effect on Within Wafer Non-Uniformity in Chemical Mechanical Polishing (화학 기계적 연마에서 패드표면 특성이 웨이퍼 불균일도에 미치는 영향)

  • Jeong, Suk-Hoon;Lee, Hyun-Seop;Jeong, Moon-Ki;Shin, Woon-Ki;Lee, Sang-Jik;Park, Boum-Young;Kim, Hyoung-Jae;Jeong, Hae-Do
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.58-58
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    • 2009
  • Uniformity related issues in chemical mechanical polishing (CMP) are within wafer non-uniformity (WIWNU), wafer to wafer non-uniformity (WTWNU), planarity and dishing/erosion. Here, the WIWNU that originates from spatial distribution of independent variables such as temperature, sliding distance, down force and material removal rate (MRR) during CMP, relies to spatial dependency. Among various sources of spatial irregularity, hardness and modulus of pad and surface roughness in sources for pad uniformity are great, especially. So, we investigated the spatial variation of pad surface characteristics using pad measuring system (PMS) and roughness measuring system. Reduced peak height ($R_{pk}$) of roughness parameter shows a strong correlation with the removal rate, and the distribution of relative sliding distance onwafer during polishing has an effect on the variation of $R_{pk}$ and WIWNU. Also, the results of pad wear profile thorough developed pad profiler well coincides with the kinematical simulation of conditioning, and it can contribute for the enhancement of WIWNU in CMP process.

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