• Title/Summary/Keyword: Contact image sensor

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Spreading and Deposition Characteristics of a Water Droplet Impacting on Hydrophobic Textured Surfaces (소수성 텍스쳐 표면에 충돌한 단일 액적의 퍼짐 및 고착 특성)

  • Lee, Jae-Bong;Moon, Joo-Hyun;Lee, Seong-Hyuk
    • Journal of ILASS-Korea
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    • v.17 no.1
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    • pp.14-19
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    • 2012
  • The present study conducts experimental investigation on spreading and deposition characteristics of a $4.3{\mu}l$ de-ionized (DI) water droplet impacting upon aluminum (Al 6061) flat and textured surfaces. The micro-textured surface consisted the micro-hole arrays (hole diameter: $125{\mu}m$, hole depth: $125{\mu}m$) fabricated by the conventional micro-computer numerical control (${\mu}$-CNC) milling machine process. We examined the surface effect of texture area fraction ${\varphi}_s$ ranging from 0 to 0.57 and impact velocity of droplet ranging from 0.40 m/s to 1.45 m/s on spreading and deposition characteristics from captured images. We used a high-speed camera to capture sequential images for investigate spreading characteristics and the image sensor to capture image of final equilibrium deposition droplet for analyze spreading diameter and contact angle. We found that the deposition droplet on textured surfaces have different wetting states. When the impact velocity is low, the non-wetting state partially exists, whereas over 0.64 m/s of impact velocity, totally wetting state is more prominent due to the increase kinetic energy of impinging droplet.

A Study on Graylevel Image Scanning System Realization Using CIS (CIS를 이용한 그레이레벨 이미지 스케닝시스템 구현에 관한 연구)

  • 김영빈;김윤호;류광렬
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.581-584
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    • 2002
  • The graylevel image scanning system realization and design using CIS(Contact Image Scanning)be amenable to recognize a papers, OMR and OCR sheet is proposed. The design technique is used CIS scanning sensor in fixing step motor and is optimized with DSP processor for image processing., and transfer input image data par line in feeding a step unit to PC on the USB interfacer. This system is portable and A4 size scanning and keeps image scan processing speed 300mm/sec The recognition percentage has 98% on the OCR and bar codes.

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Automated Wireless Recharging for Small UAVs

  • Jung, Sunghun;Ariyur, Kartik B.
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.3
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    • pp.588-600
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    • 2017
  • We develop a wireless, contact free power transfer mechanism that is safer than the direct metallic contact and robust to imperfect alignment on landing at the base station. A magnetic field is created using inductors on both the transmitting and receiving sides. We use the inductive wireless recharging to increase autonomy and decrease the sensor interference by reducing the inductor loop size. By locating four independent small receiver loops and corresponding four circuits around the quadrotor UAV, we can increase safety from circuit malfunctions in comparison to the use of just one loop. On the base station, four folding robotic bars are used to realign the receiver loops over the transmitter loops. After adequate recharging as measured by battery voltages or power consumption at the bae station, the UAV sends a signal to the base station to open the robotic bars and takes off once freed from the robotic bars.

Inspection System for Tracing Defects of Optical Film Using Contact Image Sensor (Contrast 향상 필름 평가를 위한 실시간 검사장치 개발)

  • Rhee, Hyug-Gyo;Jeon, Byeong-Hyug;Lee, Hoi-Yun;Lee, Yun-Woo
    • Korean Journal of Optics and Photonics
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    • v.19 no.4
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    • pp.310-314
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    • 2008
  • The light from the exterior considerably deteriorates the performance of displays including PDP (plasma display panel). Thus semi-conductor industries have developed a special optical film that can block or absorb the exterior light. In this paper, we propose a new inspection system for tracing the defects of the film. Our system is able to inspect a $1.5\;m\;{\times}\;1\;m$ area for 10 sec with $127\;{\mu}m\;{\times}\;50{\mu}m$ spatial resolution.

Research of Non-integeral Spatial Interpolation for Precise Identifying Soybean Location under Plastic Mulching

  • Cho, Yongjin;Yun, Yeji;Lee, Kyou-seung;Oh, Jong-woo;Lee, DongHoon
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2017.04a
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    • pp.156-156
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    • 2017
  • Most crop damages have been occurred by vermin(e.g., wild birds and herbivores) during the period between seeding and the cotyledon level. In this study, to minimize the damage by vermin and acquire the benefits such as protection against weeds and maintenance of water content in soil, immediately vinyl mulching after seeding was devised. Vinyl mulching has been generally covered with black color vinyl, that crop seeding locations cannot be detected by visible light range. Before punching vinyl, non-contact and non-destructive methods that can continuously determine the locations are necessary. In this study, a crop position detection method was studied that uses infrared thermal image sensor to determine the cotyledon position under vinyl mulch. The moving system for acquiring image arrays has been developed for continuously detecting crop locations under plastic mulching on the field. A sliding mechanical device was developed to move the sensor, which were arranged in the form of a linear array, perpendicular to the array using a micro-controller integrated with a stepping motor. The experiments were conducted while moving 4.00 cm/s speed of the IR sensor by the rotational speed of the stepping motor based on a digital pulse width modulation signal from the micro-controller. The acquired images were calibrated with the spatial image correlation. The collected data were processed using moving averaging on interpolation to determine the frame where the variance was the smallest in resolution units of 1.02 cm. For this study, the spline method was relatively faster than the other polynomial interpolation methods, because it has a lower maximum order of formulation when using a system such as the tridiagonal linear equation system which provided the capability of real-time processing. The temperature distribution corresponding to the distance between the crops was 10 cm, and the more clearly the leaf pattern of the crop was visually confirmed. The frequency difference was decreased, as the number of overlapped pixels was increased. Also the wave pattern of points where the crops were recognized were reduced.

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A Study on Graylevel Image Scanning System Realization Using CIS (CIS를 이용한 그레이레벨 이미지 스케닝시스템 구현에 관한 연구)

  • 김영빈;김윤호;류광렬
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.3
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    • pp.470-474
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    • 2002
  • The graylevel image scanning system realization and design using CIS(Contact image Scanning)be amenable to recognize a papers, OMR and OCR sheet is proposed. The design technique is used CIS scanning sensor in fixing step motor and is optimized with DSP processor for inage processing, and transfer input image data par line in feeding a step unit to PC on the USB interfacer. This system is portable ad A4 size scanning. and keeps image scan processing speed 300mm/sec. The recognition percentage has 98% on the OCR and bar codes.

CCD Scanning type MTF Measuring System for Microlens Arrays (CCD를 이용한 미세렌즈의 MTF 측정)

  • 이윤우;조현모;이인원;박태호;윤성균;서형원
    • Korean Journal of Optics and Photonics
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    • v.5 no.3
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    • pp.364-371
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    • 1994
  • Real-time MTF measuring system for testing microlens arrays with a linear CCD array is developed. The spread function of slit image that is relayed and magnified by a microscopic object lens can be measured at several times in a second. The signal uniformity and MTF of CCD is also calibrated. The experimental result of micro lens arrays developed for contact image sensor is presented.sented.

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Development and Application of Non-Contact Rock Fall Detection System utilizing Photo Sensor and Camera (광센서와 카메라를 활용한 비접촉식 낙석감지 시스템 개발 및 적용)

  • Jung, Yong-Bok;Song, Won-Kyong;Kim, Bok-Chul;Kim, Myung-Jin
    • Tunnel and Underground Space
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    • v.20 no.3
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    • pp.207-216
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    • 2010
  • Rockfall monitoring systems generally used in the country are mainly based on the detection of tension of protection wire or tilting of protection post due to rock fall. However, rock fall protection net must be installed prior to the monitoring system and continual maintenance work after each rock fall event is required for a normal operation of these detection systems. To solve these problems, we suggested and implemented a non-contact rock fall detection system using multiple photo sensors and additional camera. After a laboratory experiment and field application, we can conclude that this system is effective and reliable for detecting, collecting and analyzing the rock fall information. In addition, lighten and difference operations on two captured images were able to yield rough estimation of size and direction of rock fall.

Recognition of Tactilie Image Dependent on Imposed Force Using Fuzzy Fusion Algorithm (접촉력에 따라 변하는 Tactile 영상의 퍼지 융합을 통한 인식기법)

  • 고동환;한헌수
    • Journal of the Korean Institute of Intelligent Systems
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    • v.8 no.3
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    • pp.95-103
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    • 1998
  • This paper deals with a problem occuring in recognition of tactile images due to the effects of imposed force at a me urement moment. Tactile image of a contact surface, used for recognition of the surface type, varies depending on the forces imposed so that a false recognition may result in. This paper fuzzifies two parameters of the contour of a tactile image with the membership function formed by considering the imposed force. Two fuzzifed paramenters are fused by the average Minkowski's dist; lnce. The proposed algorithm was implemented on the multisensor system cnmposed of an optical tact le sensor and a 6 axes forceltorque sensor. By the experiments, the proposed algorithm has shown average recognition ratio greater than 869% over all imposed force ranges and object models which is about 14% enhancement comparing to the case where only the contour information is used. The pro- ~oseda lgorithm can be used for end-effectors manipulating a deformable or fragile objects or for recognition of 3D objects by implementing on multi-fingered robot hand.

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Characteristics of a-Si:H Multilayer for Contact-type Linear Image Sensor (밀착형 1차원 영상감지소자를 위한 a-Si:H 다층막의 특성)

  • Oh, Sang-Kwang;Kim, Ki-Wan;Choi, Kyu-Man
    • Journal of Sensor Science and Technology
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    • v.1 no.1
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    • pp.5-12
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    • 1992
  • We have fabricated a-Si:H multilayer for contact-type linear image sensor by means of RF glow discharge decomposition method. The ITO/i-a-Si:H/Al structure has relatively high dark current due to indium diffusion and carrier injection from both electrodes, resulting in low photocurrent to dark current. To suppress the dark current and to enhance interface electric field between ITO and i-a-Si:H film we have fabricated ITO/insulator/i-a-S:H/p-a-S:H/Al multilayer film with blocking structure. The photocurrent of ITO/$SiO_{2}(300{\AA})$/i-a-Si:H/p-a-Si:H($1500{\AA}$)/Al multilayer sensor with 5V bias voltage became saturated at about 20nA under $20{\mu}W/cm^{2}$ light intensity, while the dark current was less than 0.1nA. To increase the light generation efficiency we have adopted ITO/$SiO_{x}N_{y}(300{\AA})$/i-a-Si:H/p-a-Si:H($1500{\AA}$)/Al structure, showing photocurrent of 30nA and dark current of 0.08nA with 5V bias voltage. Also the spectral photosensitivity of the multilayer was enhanced for short wavelength visible region of 560nm, compared with that of the a-Si:H monolayer of 630nm. And its photoresponse time was about 0.3msec with the film homogeneity of 5% deviation.

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