• The Journal of the Korea institute of electronic communication sciences
• /
• v.9 no.1
• /
• pp.97-104
• /
• 2014

Recently infrared cameras have been widely used to diagnosis degradation status of the power substitution system. At the place of high magnetic field, however, electronic parts of infrared camera take a place problem that is not reasonable working due to high magnetic field. In this paper, technique of design for reflector is proposed to perform degradation diagnosis without damage of infrared camera in a power substation system including the rectifier that is able to impact to the infrared camera by high magnetic field.

• Proceedings of the KIEE Conference
• /
• 2007.10a
• /
• pp.85-86
• /
• 2007

본 논문은 기존에 사람의 인력이나 열화상 카메라에 의존하고 있는 배전선 기자재 점검을 사람대신 로봇이 점검 작업을 하고 기존의 열화상 카메라만 사용하는 점검 방법에 CCD 카메라를 추가로 사용하여 열화상 이미지와 실영상을 같이 획득하도록 하여 배전선 점검 작업의 안전성 확보와 고장진단의 결과 값들의 객관성 있고 정확한 데이터를 획득을 할 수 있도록 하였다. 그리고 로봇이 가공지선을 자율주행하면서 발생하는 포스트 간 이동, 가공지선 회피, 가공지선 다 분기와 같은 문제가 발생하게 되는데 이러한 문제점들은 센서 융합 방법을 사용하여 로봇이 가공지선을 원활하게 자율주행을 할 수 있도록 하였다. 그리고 배전선 기자재들의 자연적 현상 때문에 발생하는 기자재의 부식과 열화로 변하게 되는 기자재들의 온도를 열화상 카메라로 분석하여 배전선 기자재들의 불량 기준 온도를 초과하게 되면 열화상 이미지와 CCD 카메라의 실영상 이미지가 자동으로 캡쳐 되고 저장 될 수 있게 하였다. 이러한 모든 동작들은 로봇이 자율주행을 하면서 이루어진다.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.34 no.3
• /
• pp.248-253
• /
• 2014

Camera calibration is an indispensable process for improving measurement accuracy in industry fields such as machine vision. However, existing calibration cannot be applied to the calibration of mid-wave and long-wave infrared cameras. Recently, with the growing use of infrared thermal cameras that can measure defects from thermal properties, development of an applicable calibration target has become necessary. Thus, based on heat conduction analysis using finite element analysis, we developed a calibration target that can be used with both existing visible cameras and infrared thermal cameras, by implementing optimal design conditions, with consideration of factors such as thermal conductivity and emissivity, colors and materials. We performed comparative experiments on calibration target images from infrared thermal cameras and visible cameras. The results demonstrated the effectiveness of the proposed calibration target.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.40 no.1
• /
• pp.41-49
• /
• 2022

Recently interests on the application of thermal cameras have increased with the advance of image analysis technology. Aside from a simple image acquisition, applications such as digital twin and thermal image management systems have gained popularity. To this end, we studied the effect of emissivity on the DN (Digital Number) value in the process of derivation of a relational expression for converting DN to an actual surface temperature. The DN value is a number representing the spectral band value of the thermal image, and is an important element constituting the thermal image data. However, the DN value is not a temperature value indicating the actual surface temperature, but a brightness value indicating high and low heat as brightness, and has a non-linear relationship with the actual surface temperature. The reliable relationship between DN and the actual surface temperature is critical for a thermal image processing. We tested the relationship between the actual surface temperature and the DN value of the thermal image, and then the radiation adjustment was performed to better estimate actual surface temperatures. As a result, the relation graph between the actual surface temperature and the DN value similarly show linear pattern with the relation graph between the radiation-controlled non-contact thermometer and the DN value. And the non-contact temperature after adjusting the emissivity was closer to the actual surface temperature than before adjusting the emissivity.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.548-550
• /
• 2015

본 논문은 열화상 카메라와 가시광선 카메라를 사용하여 촬영한 영상에서 움직이는 객체에 대한 검출률을 비교한다. 각 카레라는 객체로부터 8m 떨어진 지점에 위치시켰으며, 촬영한 영상에 가우시안 필터만을 적용하여 객체를 검출하였다. 객체가 존재하는 구간에서 객체가 검출된 영상으로부터 검출률을 계산하였고, 두 개의 이동 물체로부터 얻은 영상에서 열화상 카메라와 가시광선 카메라에서 각각 98.6%와 55%의 검출률을 얻었다.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.1315-1316
• /
• 2015

본 논문에서는 원자력발전소 중대 사고를 모사한 비가시 환경에서 적외선 열화상카메라의 관측성능 (가시도)을 정량적으로 평가하고자 하였다. 이를 위해 세계기상기구의 가시도 정의를 이용하여 가시도를 측정하였으며, 측정된 가시도 조건에서 적외선 열화상카메라의 관측성능을 평가하였다.

• Journal of Korea Society of Industrial Information Systems
• /
• v.20 no.1
• /
• pp.57-62
• /
• 2015

Recently, thermography camera have been using for body-temperature monitoring. We report on fabrication of prototype thermography camera using the chalcogenide-glass lens and the camera test by analysis of thermal image. In this work, it was found out that thermography camera discerned body-temperature between 20 and $50^{\circ}C$ with noise equivalent temperature difference(NETD) of 87.7mK. It is confirmed that thermography camera using the chalcogenide-glass lens is applicable to the body-temperature monitoring system.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2023.11a
• /
• pp.111-113
• /
• 2023

자율운항선박 기술개발사업 중 2세부(자율운항선박 핵심 기관시스템 성능 모니터링 및 고장예측 진단 기술 개발)과제에서 자율운항선박 핵심장비 중 증기 배관(Steam Pipe)의 모니터링 및 고장예측 시스템 중 열화상 카메라에 의한 증기 배관(Steam Pipe)을 브라우저에서 모니터링 하는 시스템을 연구 및 개발 목표로 한다.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.34 no.4
• /
• pp.299-304
• /
• 2014

In this paper, a method is tested to measure temperatures in high-temperature welds. Protective glass was installed between an infrared thermal imaging camera and a heat source, and temperature compensation was applied to the measuring instruments. When the temperature of halogen lamps was taken in real-time and measured by the thermal camera, the temperature was found to be almost invariant with the distance between the camera and heat source. The temperature range could be predicted, through correlations with the thickness of the protective glass and the measured distance. This study suggests that the temperature measurement of welds obtained by using an infrared thermal imaging camera is valid, through experimental testing of heat sources.

• Journal of IKEEE
• /
• v.25 no.4
• /
• pp.782-785
• /
• 2021

In this paper, we propose a personalized cooling management system with thermal imaging camera. The proposed equipment uses a thermal imaging camera to control the amount of cold air and the system according to the difference between the user's skin temperature before and after the procedure. When the skin temperature is abnormally low, the cold air supply is cut off to prevent the possibility of a safety accident. It is economical by replacing the skin temperature sensor with a thermal imaging camera temperature measurement, and it can be visualized because the temperature can be checked with the thermal image. In addition, the proposed equipment improves the sensitivity of the sensor that measures the distance to the skin by calculating the focal length by using a dual laser pointer for the safety of a personalized cooling management system to which a thermal imaging camera is applied. In order to evaluate the performance of the proposed equipment, it was tested in an externally accredited testing institute. The first measured temperature range was -100℃~-160℃, indicating a wider temperature range than -150~-160℃(cryo generation/USA), which is the highest level currently used in the field. In addition, the error was measured to be ±3.2%~±3.5%, which showed better results than ±5%(CRYOTOP/China), which is the highest level currently used in the field. The second measured distance accuracy was measured as below ±4.0%, which was superior to ±5%(CRYOTOP/China), which is the highest level currently used in the field. Third, the nitrogen consumption was confirmed to be less than 0.15 L/min at the maximum, which was superior to the highest level of 6 L/min(POLAR BEAR/USA) currently used in the field. Therefore, it was determined that the performance of the personalized cooling management system applied with the thermal imaging camera proposed in this paper was excellent.