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초고속 카메라 기반 가시광 통신을 위한 거리별 측정 데이터 및 분석
서현욱(HyunWook Seo),안강일(Kang-Il Ahn),김주영(Ju-Young Kim),오준규(JunKyu Oh),임해용(Hae-Ryong Lim),정성윤(Sung-Yoon Jung),장자순(Ja-Soon Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We propose a analysis and measured data depend on distance for visible light communication based on high speed camera at intersection for ITS. In this paper, the communication between high-speed camera and a LED rear lamp is approached using LED rear lamp as the transmitter, and high-speed camera as the receiver. The LEDs in the transmitter are emitted with 4000Hz and the images of those emitting LEDs are captured with 8000fps by a high-speed camera for conducting asynchronous communication method. And experimental results using appropriate images and figures showed the effectiveness for the proposal.
초고속 카메라를 이용한 스페클 패턴 기반 미소 진동 분석
박태정,한성민,양희란,최장훈,송준영,최성록,이치범 한국소음진동공학회 2024 한국소음진동공학회 논문집 Vol.34 No.3
In this study, we present a method for measuring small amplitude vibrations using a high-speed camera. We project a laser onto an object to generate a speckle pattern that is then magnified using a lens and analyzed using a steerable pyramid. This vibration measurement method allows us to separate and measure vibrations based on the direction of the image. We demonstrated the effectiveness of our method by comparing it with traditional methods that do not generate a speckle pattern. Furthermore, we confirmed the validity of our methodology through frequency comparison experiments with a piezo accelerometer that is commonly used for vibration measurements. This novel approach to vibration measurement methodology can significantly advance research in this field.
초고속 카메라와 삼차원 표면 측정기를 이용한 삭마 재료의 정량적 표면 침식 분석
최화영(Hwa Yeong Choi),노경욱(Kyung Uk Roh),천재희(Jae Hee Cheon),신의섭(Eui Sup Shin) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.9
본 논문에서는 초고속 카메라와 삼차원 표면 측정기를 이용하여 삭마 재료의 표면 침식량을 정량적으로 분석하였다. 대기권 재진입 환경을 모사하기 위해 0.4 MW 아크 가열 풍동을 이용하여 흑연과 탄소/페놀릭 복합재료의 삭마 실험을 수행하였다. 초고속 카메라를 이용하여 실시간 삭마 실험 영상을 획득하고, 이를 분석하여 침식량과 침식률을 산출하였다. 또한, 삼차원 표면 측정기를 이용하여 삭마 전후 시편의 표면 형상을 측정하였으며, 시편의 높이 차이로부터 침식량 분포를 정밀하게 산출하였다. 이를 통해 표면 침식 현상을 종합 분석하는데 있어서 두 측정 결과를 상호 보완하는 것이 유효함을 확인하였다. In this paper, the surface recession of ablative materials was quantitatively analyzed using a high-speed camera and a three-dimensional profilometer. The ablation tests of the graphite and carbon/phenolic composite samples were performed using a 0.4 MW arc-heated wind tunnel for simulating the atmospheric re-entry environment. The real-time images during the ablation test were captured by the high-speed camera, and analyzed to calculate the surface recession and recession rate. Also, the surface data of samples were obtained using a three-dimensional profilometer, and the surface recession was precisely calculated from the difference of height between the surface data before and after the test. It is effective to complement the two measurement results in the comprehensive analysis of surface recession phenomena.
LED 후미등 및 초고속 카메라를 이용한 차량간 통신알고리즘
김주영(Ju-Young Kim),서현욱(Hyun-Wook Seo),안강일(Kang-Il Ahn),오준규(Jun-Kyu Oh),임해용(Hea-Ryong Lim),정성윤(Seung-Yoon Jung),장자순(Ja-Soon Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We propose an efficient vehicle-to-vehicle communication algorithm that uses LED rear lamp as a transmitter and the high-speed camera as a receiver. Visible light communication is a wireless communication method using luminance, transmitting vehicle information data by emitting light. In this paper, LED transmitter is modulated by using 8-pulse position modulation scheme and the high-speed camera is used as a receiver for demodulating the signals by using image processing techniques. We performed examination of the transmission speed according to the our communication system. The actual proof experiment of the proposed system was conducted under the laboratory conditions.
광학계측 및 유량-강우량 보정기법을 통한 강우시험기 개발
강태엽 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.3
In order to guarantee reliability of the environmental testing on defense systems, it is important to use test equipment that meets requirements of the related test standards. Especially with regard to the rain test method in MIL-STD-810G w/change 1, the latest standard, it has been highly needed to introduce a novel technique and system to provide droplet- size and precipitation-rate conditions. In this study, droplet-diameter spectra of various nozzles were measured by a high-speed camera. Then, a pair of nozzles were selected based on the experimental results showing the spectra lie within the range from 0.5 mm to 4.5 mm, as suggested in the rain test method. Also, the flow-precipitation rate calibration system was developed to precisely correlate the precipitation rate measured in the chamber and the flow rate into the nozzle bank. In conclusion, the rain test equipment has been successfully developed fulfilling the requirements of the test standard.