• 한국표면공학회지
• /
• 제42권2호
• /
• pp.95-101
• /
• 2009

This study is the research on the thermal emissivity depending on the bulk graphite's alignment degree. Bulk graphites were manufactured by uni-axial pressing and subsequent heat treatment of natural graphite flakes with organic binder. The samples were prepared to be $0^{\circ}$ (relative to the 002 c-face), $45^{\circ}$, and $90^{\circ}$ (relative to the 100 a-face) for measuring alignment degree. The alignment degree of the sample was measured by XRD. The thermal emissivity was measured by infrared thermal image camera at $100^{\circ}C$ and compared with the value obtained by Infrared spectroscopy. The alignment degree and thermal emissivity of $0^{\circ}$ sample were measured to be 0 and 0.70 respectively. And those of $90^{\circ}$ sample were 0.73 and 0.80 respectively. The emissivity value was correlated with obtained by IR spectroscopy. Therefore it was considered that the thermal emissivity of the bulk graphite is correlated with the alignment degree.

• 한국융합학회논문지
• /
• 제9권6호
• /
• pp.203-207
• /
• 2018

본 연구는 초점거리가 24mm 인, 대기투과 특성이 좋은 $3{\sim}5{\mu}m$ 파장대역의 적외선의 상을 결상할 수 있는 렌즈계의 설계 개발에 관한 것이다. 설계는 상용 설계 프로그램인 CodeV를 사용하였고, 색수차, 구면수차 및 왜곡 제거에 가중치를 가지는 최적화를 진행하였다. 설계되어진 렌즈계는 Si와 Ge로 구성된 2매의 렌즈로 이루어져 있는데, 각각의 렌즈는 한 면이 비구면으로 이루어져 있다. 그리고 이 광학계는 선폭 20lp/mm에서는 MTF값이 0.40, 선폭 29lp/mm에서는 MTF값이 0.25인 특성의 분해능을 갖게 되었다. 이 광학계는 $25{\mu}m$ pixel의 $206{\times}156$ 어레이 및 $17{\mu}m$ pixel의 $320{\times}240$ 어레이 적외선 검출소자를 사용하는 MWIR용 열화상 카메라에 적용할 수 있는 성능을 가진 것으로 판단된다.

• Journal of the Korean Wood Science and Technology
• /
• 제38권6호
• /
• pp.518-525
• /
• 2010

적외선 열화상 기술은 물체의 표면에서 방사되는 적외선을 검출하여 그 물체의 표면온도 분포를 나타내는 기술로서 물체의 내부 상태도 간접적으로 표현할 수 있다. 이 기술은 광범위한 분야에서 피사체의 물리적 손상이 허락되지 않을 경우 사용되고 있다. 본 실험에서는 "적외선 촬영법에 의한 건축물 단열 성능 평가 방법"(KS F2829)에 의거하여 결함부위 온도차 비율법(TDR : Temperature Difference Ratio)라는 지표로 국립산림과학원내 목조주택의 단열성능을 평가하였다. 실험을 위한 공간을 목조주택의 2층 방으로 정하고 적외선 카메라로 방의 실내와 실외의 표면온도를 측정하였다. 열화상 이미지를 이용하여 모서리 부분과 창을 통한 열손실을 정량적으로 파악할 수 있었으며 육안으로 확인 불가능한 열손실 결함부위를 탐지할 수 있었다. 이를 바탕으로 기존목조주택의 열환경성능 제고를 위한 개 보수시 도움이 될 것으로 기대된다.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
• /
• pp.512-514
• /
• 2004

The Electro-Optical Camera (EOC) is a high spatial resolution, visible imaging sensor which collects visible image data of the earth's sunlit surface and is the primary payload on KOMPSAT-l. The purpose of the EOC payload is to provide high resolution visible imagery data to support cartography of the Korean Peninsula. The EOC is a push broom-scanned sensor which incorporates a single nadir looking telescope. At the nominal altitude of 685Km with the spacecraft in a nadir pointing attitude, the EOC collects data with a ground sample distance of approximately 6.6 meters and a swath width of around 17Km. The EOC is designed to operate with a duty cycle of up to 2 minutes (contiguous) per orbit over the mission lifetime of 3 years with the functions of programmable gain/offset. The EOC has no pointing mechanism of its own. EOC pointing is accomplished by right and left rolling of the spacecraft, as needed. Under nominal operating conditions, the spacecraft can be rolled to an angle in the range from +/- 15 to 30 degrees to support the collection of stereo data. In this paper, the status of EOC such as temperature, dark calibration, cover operation and thermal control is checked and analyzed by continuously monitored state of health (SOH) data and image data during the mission life of 3 years. The aliveness of EOC and operation continuation beyond mission life is confirmed by the results of the analysis.

• 한국안전학회지
• /
• 제29권2호
• /
• pp.1-6
• /
• 2014

In this paper, safety certification products and safety condition of small transformer is analyzed in industries field and educational facilities. In transformer of 50places, absolute majority is step down transformer to measure of instrument. Most transformers were below 5kVA and 1~3kVA capacity was the mainstream. In industries field, 5 transformers were found without safety certification according to the Electrical Appliances Safety Control Act as cheap product prefer and lack of safety consciousness. Mark & number, voltage, date of manufacture of safety certification must show item of certification. However date of manufacture showed in product of 18%, 9places. As result of thermal imaging camera, running temperature of transformer was showed in below of target temperature. However as a narrow space of transformer and wall, power cable was touched on a ventilating flue in transformer. It was simple carelessness case that surface fouling and temperature ageing of transformer accelerate. Power poor connection, neglect of transformer in production equipment, fall damage by setup incongruity and ground omission were found in case of illogicality item of transformer.

• 한국산업융합학회 논문집
• /
• 제18권1호
• /
• pp.18-29
• /
• 2015

This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The system was introduced into a real building and was examined by the field measurement. Judging from the measurements during three years(1999~2001), the state of the system operation was very stable through this period and it was clear that the system contributes to reduction of energy consumption for air-conditioning. Futhermore, a simulation model used the simple heat diffusion equation was developed to simulate its thermal characteristics and performances. The simulations resulted in air temperature in good agreement with the measurements. Also, from the result of numerical analysis, it is clear that the amount of heat supply by using this system is more than the amount of energy loss to the room above it. Therefore, it is concluded that this systems is very useful and the proposed numerical model can be used for the prediction of system thermal performance.

• 한국ITS학회 논문지
• /
• 제19권6호
• /
• pp.96-106
• /
• 2020

본 연구에서는 루프 센서를 통한 교통량 수집방식의 오류를 해결하기 위해 1종(승용차)과 3종(일반 트럭)의 구분이 어려운 부분 및 영상 이미지의 단점을 보완하기 위해 도로변에 열화상 카메라를 설치하여 영상 이미지를 수집하였다. 수집된 영상 이미지를 레이블링 단계를 거쳐 1종(승용차)과 3종(일반 트럭)의 학습데이터를 구성하였다. 정지영상을 대상으로 labeling을 진행하였으며, 총 17,536대의 차량 이미지(640x480 pixel)에 대해 시행하였다. 열화상 영상 기반의 차종 분류를 달성하기 위해 CNN(Convolutional Neural Network)을 이용하였으며, 제한적인 데이터량과 품질에도 불구하고 97.7%의 분류정확도를 나타내었다. 이는 AI 영상인식 기반의 도로 교통량 데이터 수집 가능성을 보여주는 것이라 판단되며, 향후 더욱더 많은 학습데이터를 축적한다면 12종 차종 분류가 가능할 것이다. 또한, AI 기반 영상인식으로 도로 교통량의 12종 차종뿐만 아니라 다양한(친환경 차량, 도로 법규 위반차량, 이륜자동차 등) 차종 분류를 할 수 있을 것이며, 이는 국가정책, 연구, 산업 등의 통계 데이터로 활용도가 높을 것으로 판단된다.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2008년도 추계학술대회 논문집
• /
• pp.439-443
• /
• 2008

Painting process or coating with acrylic film may improve the surface defects of injection molded parts deteriorated by weldlines. flow marks. and etc. However such processes increase the production costs and increase environmental problems. Recently various types of rapid mold heating & cooling technology have been developed in order to improve surface quality of products. In this study. the heating & cooling performance of a telephone case mold is investigated by heat transfer analysis, in which the rapid mold heating & reeling technology is applied. The surface temperature of the mold was measured using thermal image camera and compared with analysis results. The influence of the rapid mold heating & cooling technology on weldline appearance and cycle time increase was also examined.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집E
• /
• pp.733-737
• /
• 2001

Heat generated from the electronic parts in PDP is undesirable physical properties. To attain optimal arrangement of the electronic parts in PDP, thermal flows in PDP should be analyzed. PIV measurement has been made to quantify the characteristics of the inner flows and outer flows of an actual PDP. The quantity of heat flux from PDP has been estimated using the PIV results. Measurement system consists of Ar-ion laser, CCD camera and an image grabber installed on a host computer.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2005년도 춘계학술대회논문집
• /
• pp.426-430
• /
• 2005

The fiber-optic interferometer which is a powerful application for nondestructive measurement techniques has many advantages such as capability of making portable system, easy optical arrangement, low optical loss. In spite of these advantages, this system has an environmental sensitivity of thermal drifts and vibrations. Against environmental perturbations and nonlinear characteristic of phase modulator, the accurate and fast ${\pi}/2$ phase stepping has been achieved by using zero-crossing detection. CCD camera trigger signal is generated at the 4 zero-crossing points. Our System has achieved up to 100 Hz of image capture speed and 0.6 mrad of accuracy of phase stepping, accuracy.