적외선 카메라-레이저 공통광학계의 레이저빔 열 영향성 분석

김성재 한국광학회 2017 한국광학회지 Vol.28 No.4

An infrared camera and laser common-path optical system is applied to DIRCM (directional infrared countermeasures), toincrease boresighting accuracy and decrease weight. Thermal effects of a laser beam in a common-path optical system are analyzedand evaluated, to predict any degradation in image quality. A laser beam with high energy density is absorbed by and heats theoptical components, and then the surface temperature of the optical components increases. The heated optical components of thecommon-path optical system decrease system transmittance, which can degrade image quality. For analysis, the assumed simulationcondition is that the laser is incident for 10 seconds on the mirror (aluminum, silica glass, silicon) and lens (sapphire, zincselenide, silicon, germanium) materials, and the surface temperature distribution of each material is calculated. The wavelengthof the laser beam is 4 μm and its output power is 3 W. According to the results of the calculations, the surface temperatureof silica glass for the mirror material and sapphire for the lens material is higher than for other materials; the main reason forthe temperature increase is the absorption coefficient and thermal conductivity of the material. Consequently, materials for theoptical components with high thermal conductivity and low absorption coefficient can reduce the image-quality degradation dueto laser-beam thermal effects in an infrared camera and laser common-path optical system.

저온-진공 흑체시스템의 설계 및 성능 평가

김기석(Ghiseok Kim),장기수(Ki Soo Chang),이상용(Sang-Yong Lee),김건희(Geon-Hee Kim),김동익(Geon-Hee Kim) 한국비파괴검사학회 2013 한국비파괴검사학회지 Vol.33 No.4

본 논문에서는 저온-진공 흑체시스템의 설계 및 구성과 함께 흑체시스템의 수학 모델을 이용한 열해석 평가 방법과 그 결과를 제시하였으며 적외선 카메라를 이용한 흑체시스템의 평가 방안 및 결과를 명시하였다. 개발된 흑체시스템은 기존의 시스템에 비해 상대적으로 규모가 소형이며 273 K이하의 저온에서 수증기가 응결될 수 있는 현상을 방지하기 위하여 흑체시스템 내부를 진공 (2.67 × 10<SUP>-2</SUP> ㎩) 상태로 유지되도록 제작되었다. 또한 흑체시스템 내부의 열손실로 인한 성능 저하를 막기 위하여 radiator가 설치되는 부위에는 heat sink, heat shield 및 cold shield를 설계하였다. 흑체시스템의 수학 모델에 대한 열 해석을 위해서 변형된 스테판-볼츠만의 정리를 이용하여 radiator의 성능을 검증하였고 실제 흑체시스템에서 방사되는 적외선 신호에 대해서는 적외선 카메라를 이용하여 신호전달함수 및 온도분해능을 측정, 분석하였다. 제안된 설계와 해석 및 실험 결과에 근거하여, 개발된 저온-진공 흑체시스템은 적용온도범위인 268~333 K 구간에서 적외선 측정장치의 캘리브레이션을 위한 기준장치로서 성능이 안정적이고 적용이 적합한 것으로 확인되었다. In this paper, the design concept of a low-temperature vacuum blackbody was described, and thermophysical model of the blackbody was numerically evaluated. Also the working performance of low-temperature vacuum blackbody was evaluated using infrared camera system. The blackbody system was constructed to operate under high-vacuum conditions (2.67 × 10<SUP>-2</SUP> ㎩) to reduce temperature uncertainty, which is caused by vapor condensation at low temperatures usually below 273 K. In addition, both heat sink and heat shield including cold shield were installed around radiator to prevent heat loss from the blackbody. Simplified mathematical model of blackbody radiator was analyzed using modified Stefan-Boltzmann’s rule. The infrared radiant performance of the blackbody was evaluated using infrared camera. Based on the results of measurements, and simulation, temperature stability of the low-temperature vacuum blackbody demonstrated that the blackbody system can serve as a highly stable reference source for the calibration of an infrared optical system.

동절기 온실의 열 손실에 관한 실태조사 - 경남지역을 중심으로 -

임재운,윤성욱,윤용철,김현태 (사) 한국생물환경조절학회 2013 생물환경조절학회지 Vol.22 No.1

An experiment was conducted to study incidences of heat loss in greenhouse in Gyeongnam provinceusing thermal imaging camera in order to determine ways minimizing greenhouse heat loss. Measurements of thiswork showed that temperature differences between two experiment zones before and after installation of thermal curtainswere about 2.0~3.0℃ and 1.0~2.0℃ respectively. There was a high correlation between the temperature datameasured using a thermal imaging camera and a temperature sensor. There was no serious difference among areas,but between places on the first and second floor with thermal curtains for heat insulation, there was a relatively largerheat loss on the first floor than the second floor. Then in general the greenhouse types had no particular bearing onthis matter, there was a relatively large heat loss in the parts of side wall window, the gaps and the parts folded ofhorizontal thermal curtains, the gutter parts, and the gaps of thermal curtain in the side wall window and facade ·back side for heat insulation, aren’t completely sealed. It was found that there was a substantial heat loss due to infiltrationthrough cracks on covering material, doors, ventilating openings, roof gables and floors, in particular. 본 연구에서는 온실의 열손실을 최소화할 방안을 모색하기 위하여 경남지역에 있는 시설 농가를 대상으로 열화상 카메라를 이용하여 열손실 사례에 대한 실태조사를실시하였다. 그 결과를 요약하면 다음과 같다. 치마처리전·후의 두 실험구간의 온도차는 각각 2.0~3.0℃ 및1.0~2.0℃ 정도인 것을 알 수 있다. 열화상 기기에 의해계측된 온도와 온도 센서에 의해 계측된 온도와는 상관관계가 큰 것으로 나타났다. 실태조사 지역 간에 큰 차이는 없었지만 보온용 부직포가 1층인 경우와 2층인 경우를 보면, 1층이 2층에 비해 상대적으로 열손실 크게나타났다. 그리고 전체적으로 온실의 형태와 무관하게측장부분과 수평보온커튼의 틈새, 측면과 전·후면 보온용 부직포의 이음부분이 완전히 밀폐되지 않아 열손실이상대적으로 큰 것으로 나타났다. 특히, 파손된 피복재나출입문, 환기구, 박공, 바닥부근 등에서 틈새가 생겨서많은 양의 열이 손실되고 있었다.

열적외선 카메라용 광학계 생산성 향상에 관한 연구

김성용(Kim Sung-yong),현동훈(Hyun Dong-hun) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.3

Thermal infrared cameras have been conducted actively in various application areas, such as military, medical service, industries and cars. Because of their characteristic of sensing the radiant heat emitted from subjects in the range of long-wavelength(3∼5㎛ or 8∼12㎛), and of materializing a vision system, when general optics materials are used, they don’t react to the light in the range of long-wavelength, and can’t display their optic functions. Therefore, the materials with the feature of higher refractive index, reacting to the range of long-wavelength, are to be used. The kinds of materials with the characteristic of higher refractive index are limited, and their features are close to those of metals. Because of these metallic features, the existing producing method of optical systems were direct manufacturing method using grinding method or CAD/CAM, which put limit on productivity and made it difficult to properly cope with the increasing demand of markets. GASIR, a material, which can be molded easily, was selected among infrared ray optics materials in this study, and the optical system was designed with two Aspheric lenses. Because the lenses are molded in the environment of high temperature and high pressure, they require a special metallic pattern. The metallic pattern was produced with materials with ultra hardness that can stand high temperature and high pressure. As for the lens mold, GMP(Glass Molding Press) of the linear transfer method was used in order to improve the productivity of optical systems for thermal infrared cameras, which was the goal of this paper.

공작기계 스핀들 부위의 열분포 분석 및 오차 보정

고한서(H. S. Ko),박광희(K. H. Park),서형렬(H. -R. Seo),하종수(J. -S. Ha) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4

Thermal error compensation has been developed for CNC (Computer Numerical Control) machining center with moving heat sources. The thermal error in CNC machining center has an effect on machining accuracy more than the geometric error does. Thus, temperature distributions of a spindle unit have been analyzed numerically by a Finite Differential Method and experimentally by an infrared (IR) camera in this study. A multiple variable method has been derived to estimate the thermal deformation of the machine origin stably and effectively after measuring deformation and temperature data. The experimental results for a vertical machining center have shown that the thermal errors of the machine origins were reduced more than 30% by the developed method.

열적외선 카메라용 광학계 생산성 향상에 관한 연구

김성용,현동훈 한국생산제조학회 2009 한국생산제조학회지 Vol.16 No.3

Thermal infrared cameras have been conducted actively in various application areas, such as military, medical service, industries and cars. Because of their characteristic of sensing the radiant heat emitted from subjects in the range of long-wavelength(3∼5㎛ or 8∼12㎛), and of materializing a vision system, when general optics materials are used, they don’t react to the light in the range of long-wavelength, and can’t display their optic functions. Therefore, the materials with the feature of higher refractive index, reacting to the range of long-wavelength, are to be used. The kinds of materials with the characteristic of higher refractive index are limited, and their features are close to those of metals. Because of these metallic features, the existing producing method of optical systems were direct manufacturing method using grinding method or CAD/CAM, which put limit on productivity and made it difficult to properly cope with the increasing demand of markets. GASIR, a material, which can be molded easily, was selected among infrared ray optics materials in this study, and the optical system was designed with two Aspheric lenses. Because the lenses are molded in the environment of high temperature and high pressure, they require a special metallic pattern. The metallic pattern was produced with materials with ultra hardness that can stand high temperature and high pressure. As for the lens mold, GMP(Glass Molding Press) of the linear transfer method was used in order to improve the productivity of optical systems for thermal infrared cameras, which was the goal of this paper.

32×32 열적외선 카메라의 광학계에 관한 연구

이진형(J.H. Lee),김기호(K.H. Kim),서정철(J.C. Seo),현동훈(D.H. Hyun) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-

This study is about processing thermal infrared ray camera with a single lens using germanium, and AR coating. OSLO is used for optical design, structure is designed with Auto CAD, Solidworks and DTM is used to process the lens. It now is possible to have a smaller thermal infrared ray camera that have same performance with exciting thermal infrared ray cameras.

32×32 열적외선 카메라의 광학계에 관한 연구

이진형(J.H. Lee),김기호(K.H. Kim),서정철(J.C. Seo),현동훈(D.H. Hyun) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10

This study is about processing thermal infrared ray camera with a single lens using germanium, and AR coating. OSLO is used for optical design, structure is designed with Auto CAD, Solidworks and DTM is used to process the lens. It now is possible to have a smaller thermal infrared ray camera that have same performance with exciting thermal infrared ray cameras.

크레인 디스크 패드 모니터링을 위한 스마트폰 기반의 열영상 진단 시스템 개발

오연재(Yeon-Jae Oh),박경욱(Kyoung-Wook Park),김응곤(Eung-Kon Kim) 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.12

그랩 크레인은 부두 항만으로 모래 및 토사가 퇴적이 되거나, 해저 공사를 하기 위해 다목적으로 사용된다. 그립 크레인의 구성 요소 중 와이어 드럼과 디스크 브레이크 패드는 핵심적인 소모품으로 많은 열이 발생되며 교체 시 가격이 매우 비싸다는 단점이 있다. 본 논문에서는 그랩 크레인의 와이어 드럼에 작용되는 디스크 브레이크 패드에 대한 열화상 진단 시스템을 제안한다. 제안된 시스템은 브레이크 고장 및 디스크 패드손상 전에 디스크 및 패드 표면의 온도가 비정상적으로 분포하는 특징을 이용하여 열화상을 통해 패드 열 진단 분석을 수행한다. 따라서 기계 부품의 이상을 고장 전에 미리 발견하여 고장으로 인한 피해를 방지할 수있으며, 과부하 유무를 상시체크하면서 크레인을 작동시켜 패드의 수명 연장과 비용을 절감할 수 있다 Grab cranes are used for multi-purpose when the sand and soil are deposited into harbor wharf or the undersea construction is performed. Among the components of crane grab, the wire drum and disc brake pad are key expendables and have disadvantages that lot of heat is generated and very expensive when replacing them. In this study, the thermal image analysis for the disc brake, which works with wire drum of the crane is suggested. The suggested system performs the pad thermal diagnosis through the thermal image using the characteristics that the disc and pad surface temperatures are distributed abnormally before the brake failure and the disc pad damage. Therefore, the damage by the failure can be prevented by discovering the abnormality of the machine parts before failure and the life cycle of the pad and the cost can be extended and saved by operating the crane performing constant checkup for the overload.

의복의 여유분에 따른 단열력의 변화와 Thermogram을 활용한 의복 표면 온도 특성 분석

이병철(Lee, Byungcheol),홍경희(Hong, Kyunghi),이예진(Lee, Yejin) 한국생활과학회 2010 한국생활과학회지 Vol.19 No.6