• 한국농림기상학회지
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• 제25권3호
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• pp.226-235
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• 2023

본 연구는 개선된 '다중센서 기반 무인 서리관측시스템(MFOS, Multiple-sensor based Frost Observation System)'을 소개하였다. 개선된 시스템인 MFOS v2는 엽면습윤센서를 기반으로 서리 감지는 물론, 서리 발생 주요 인자인 표면온도 예측을 위한 기능도 겸한다. 기존 관측 시스템은 1) 엽면습윤센서 표면이 대부분의 가시광선을 반사하기 때문에 RGB 카메라로 엽면습윤센서 촬영 시 표면에 발생한 얼음(서리) 관측이 어려움, 2) 일출 전과 후에 RGB 카메라 촬영 결과가 어두움, 3) 열적외선 카메라가 온도의 상대적인 고저만을 보여주는 단점들이 존재하였다. 엽면습윤센서 표면에 발생한 얼음(서리) 파악을 위해 검정색으로 표면 도색된 엽면습윤센서를 추가 설치하였고, 동일한 높이에 유리판들을 설치하여 얼음(서리) 발생 확인을 위한 보조 도구로 활용하였다. 일출 전과 후에 RGB 카메라 촬영을 위해 카메라 촬영 시간에 맞춰 전원이 On/Off 되도록 LED 조명을 연동시켜 설치하였다. 상대적인 온도의 높고 낮음 판단만 가능했던 기존의 열적외선 카메라도 픽셀당 온도 값 추출이 가능하도록 개선하였다. 이러한 개선 사항들을 반영한 MFOS v2는 실제 농경지에 설치하여 운영 중이며, 서리예측 모델에 들어갈 입력자료를 생산하는 진보된 서리 관측시스템으로서 중요한 역할을 할 것으로 기대된다.

• 한국안전학회지
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• 제32권6호
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• pp.98-103
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• 2017

In Korea, the guideline for the bridge safety inspection requests to assess surface degradation, including crack, efflorescence, spalling, and so on, for the rating of concrete bridges. Currently, the assessment of efflorescence is performed based on the visual inspection of expertized engineers, which may result in subjective inspection result. In this study, a novel method using a hyperspectral camera is proposed for objective and accurate assessment of concrete efflorescence. The hyperspectral camera acquires the light intensity for a number of continuous spectral bands of light for each pixel in an image, which makes the hyperspectral imaging technique provides more detailed information than a color camera that collects intensity for only three bands corresponding to RGB (red, green, and blue) colors. A stepwise assessment algorithm is proposed based on the spectral features to decompose efflorescence area from the inspected concrete area. The algorithm is tested in the laboratory test using two concrete specimens, one of which is dark colored with efflorescence on a surface while the other is bright concrete without efflorescence. The test shows high accuracy and applicability of the proposed efflorescence assessment using a hyperspectral camera.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2009년도 추계학술대회 초록집
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• pp.243-244
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• 2009

진공 chamber 내부 plasma를 외부에서 view port를 통한 확인 및 촬영보다 효율을 높이기 위하여 chamber 내부에 무선 camera (IVC : internal vacuum camera)를 삽입하여 더 세밀하게 plasma를 촬영하였고 view port로 확인이 불가능한 부분을 촬영 및 녹화하였다. 외부 view port로 확인할 수 없는 원거리 플라즈마 소스 (remote plasma source, RPS)와 in-line type의 chamber에서 동적 (dynamic) 증착이 이루어지는 substrate에 camera를 부착하여 이동 중 target 위쪽에 방전된 plasma, ICP (inductively coupled plasma) antenna를 진공 중 chamber 내부에서 촬영 및 녹화하였다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2003년도 추계학술발표회 논문집
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• pp.135-140
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• 2003

This study try to surface deformation analyzing and 3-D monitoring of hydro structure by close-range photogrammetry technique using 35mm metric camera. For this, the lens distortion parameters were acquired for 21mm super-wide-angle lens which is mounted in 35mm metric camera. After that, the system designed for absolute deformation analysis of object surface, and examined the application validity Also, optimum photographing condition was derived by calculated the standard deviation of this system. This system can monitor periodically changing of surface area, volume and deformation precisely after placed plate underwater. Finally, this paper suggested efficiency of absolute deformation analysis by using small format camera.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.580-584
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• 2004

In the present study, an evaluation technology for heating channel layout was investigated in SMC molding system design. Conventional design rules of cooling channel in injection molding process were applied to the present work. Finite element thermal analysis with ANSYSTM was performed to evaluate the temperature distribution of mold surface. SMC mold was manufactured to test the effect of a proposed heating channel layout system on the temperature distribution of mold surface and infrared camera was applied to a measurement of temperature. It was shown that infrared camera application was possible in a measurement of temperature distribution on mold surface.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집
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• pp.459-462
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• 2002

The conventional thermal insulator and power transformer testing is widely used in surface aging measurement of outside insulator because those testing can carry out very short time in Lab testing. Also thermal testing is able to offer the standard judgement of relative degradation level of outside HV machine. There it is very useful method compare to previous conventional thermal testing method and effective Lab testing method. But surface discharges(SD) have very complex characteristics of discharge pattern so it is required estimation research to development of precise analysis method. In recent, the study of IRR-camera is carrying out discover of temperature of power equipment through condition diagnosis and system development of degradation diagnosis. In this study, thermal testing of Power transformer is measured with partial temperature distribution in real time.

• 소성∙가공
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• 제14권3호
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• pp.263-268
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• 2005

Heating channel layout design and evaluation technology for SMC molding system was investigated in this work. Traditional rules of cooling channel design in injection molding were applied to the present work. Finite element thermal analysis with $ANSYS^{TM}$ was performed to evaluate the temperature distribution of SHC mold surface. SMC mold was manufactured to evaluate the effect of a proposed heating channel layout system on the temperature distribution of SMC mold surface and infrared camera was applied to a measurement of temperature distribution. It was shown that infrared camera application was possible in a measurement of temperature distribution on SHC mold surface.

• 한국광학회지
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• 제28권4호
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• pp.141-145
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• 2017

기존의 표준적인 비구면 방정식보다 고도의 비구면을 훨씬 더 효과적으로 생성해 낼 수 있는 Forbes 비구면 방정식을 활용하여 F/1.8의 스마트폰용 카메라렌즈를 설계하였고 설계목표를 달성하기 위한 설계의 주요 방법론과 설계의 절차적인 과정에 대해서도 설명하였다.

• 한국광학회:학술대회논문집
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• 한국광학회 2006년도 하계학술발표회 논문집
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• pp.79-80
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• 2006

• 한국정밀공학회지
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• 제23권5호
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• pp.44-50
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• 2006

This paper describs about the technique of ultra-precision machining for an infrared(IR) camera aspheric mirror. A 200 mm diameter aspheric mirror was fabricated by SPDTM(Single Point Diamond Turning Machine). Aluminum alloy as mirror substrates is known to be easily machined, but not polishable due to its ductility. Aspheric large reflector without a polishing process, the surface roughness of 5 nm Ra, and the form error of ${\lambda}/2\;({\lambda}=632.8\;nm)$ for reference curved surface 200 mm has been required. The purpose of this research is to find the optimum machining conditions for cutting reflector using Al6061-T651 and apply the SPDTM technique to the manufacturing of ultra precision optical components of Al-alloy aspheric reflector. The cutting force and the surface roughness are measured according to each cutting conditions feed rate, depth of cut and cutting speed, using diamond turning machine to perform cutting processing. As a result, the surface roughness is good when feed rate is 1mm/min, depth of cut $4{\mu}m$ and cutting speed is 220 m/min. We could machined the primary mirror for IR camera in diamond machine with a surface roughness within $0.483{\mu}m$ Rt on aspheric.