• 비파괴검사학회지
• /
• 제34권2호
• /
• pp.128-134
• /
• 2014

Infrared thermography is an emerging approach to non-contact, non-intrusive, and non-destructive inspection of various solid materials such as metals, composites, and semiconductors for industrial and research interests. In this study, data processing was applied to infrared thermography measurements to detect defects in metals that were widely used in industrial fields. When analyzing experimental data from infrared thermographic testing, raw images were often not appropriate. Thus, various data analysis methods were used at the pre-processing and processing levels in data processing programs for quantitative analysis of defect detection and characterization; these increased the infrared non-destructive testing capabilities since subtle defects signature became apparent. A 3D finite element simulation was performed to verify and analyze the data obtained from both the experiment and the image processing techniques.

• 한국구조물진단유지관리공학회 논문집
• /
• 제3권2호
• /
• pp.185-190
• /
• 1999

It is difficult to estimate for deterioration of exterior wall by infrared thermography, because of amount of infrared-ray radiation effected by environmental factors such as temperature properties of materials, the outside air and the amount of solar radiation. Therefore we measured the distribution of temperature by times in the same reinforced-concrete structure in order to reduce problems, occasioned by environmental factors, then we analyzed physical influence factors of the infrared thermography. It is the aim of this study to suggest basic data with regard to method of estimation-system for deterioration of exterior wall in reinforced-concrete structures.

• 비파괴검사학회지
• /
• 제32권3호
• /
• pp.307-313
• /
• 2012

• Journal of Korean Neurosurgical Society
• /
• 제57권4호
• /
• pp.283-288
• /
• 2015

Objective : This study aims to visualize the subjective symptoms before and after the treatment of whiplash injury using infrared (IR) thermography. Methods : IR thermography was performed for 42 patients who were diagnosed with whiplash injury. There were 19 male and 23 female patients. The mean age was 43.12 years. Thermal differences (${\Delta}T$) in the neck and shoulder and changes in the thermal differences (${\Delta}dT$) before and after treatment were analyzed. Pain after injury was evaluated using visual analogue scale (VAS) before and after treatment (${\Delta}VAS$). The correlations between ${\Delta}dT$ and ${\Delta}VAS$ results before and after the treatment were examined. We used Digital Infrared Thermal Imaging equipment of Dorex company for IR thermography. Results : The skin temperature of the neck and shoulder immediately after injury showed $1-2^{\circ}C$ hyperthermia than normal. After two weeks, the skin temperature was normal range. ${\Delta}T$ after immediately injuy was higher than normal value, but it was gradually near the normal value after two weeks. ${\Delta}dT$ before and after treatment were statistically significant (p<0.05). VAS of the neck and shoulder significantly reduced after 2 week (p=0.001). Also, there was significant correlation between ${\Delta}dT$ and reduced ${\Delta}VAS$ (the neck; r=0.412, p<0.007) (the shoulder; r=0.648, p<0.000). Conclusion : The skin temperature of sites with whiplash injury is immediately hyperthermia and gradually decreased after two weeks, finally it got close to normal temperature. These were highly correlated with reduced VAS. IR thermography can be a reliable tool to visualize the symptoms of whiplash injury and the effectiveness of treatment in clinical settings.

• 비파괴검사학회지
• /
• 제29권5호
• /
• pp.421-426
• /
• 2009

열화상 카메라와 대상물의 측정 위치에 따른 방사각도에 따라 방사율은 달라지게 된다. 이로 인해 열화상 시스템을 이용한 온도 측정시 나타나는 온도 분포는 절대적 온도로 볼 수 없다. 대상체의 실제 표면 온도가 일정하더라도 열화상 카메라로 측정된 온도는 방사율 값에 따라 오차를 가지게 된다. 본 논문에서는 동일 온도로 가열된 원통 형태를 가지는 대상체와 평면 형태를 가지는 대상체의 온도를 열화상 카메라를 이용하여 측정하였다. 측정된 표면 온도값을 통하여 화각에 의한 방사율 보정표와 방사각도의 영향에 의한 반사율 보정식을 구하였으며 이를 바탕으로 측정 온도의 오차보정을 수행하였다. 그리고 방사 각도와 화각에 따른 온도 영향을 원자력 배관의 결함 검출에 적용하여 더욱 신뢰성 있는 표면 온도값을 획득하였다.

• Asian Pacific Journal of Cancer Prevention
• /
• 제16권18호
• /
• pp.8619-8623
• /
• 2016

Background: Breast cancer is a common disorder in women, constituting one of the main causes of death all over the world. The purpose of this study was to determine the diagnostic value of the breast tissue diseases by the help of thermography. Materials and Methods: In this paper, we applied non-contact infrared camera, INFREC R500 for evaluating the capabilities of thermography. The study was conducted on 60 patients suspected of breast disease, who were referred to Imam Khomeini Imaging Center. Information obtained from the questionnaires and clinical examinations along with the obtained diagnostic results from ultrasound images, biopsies and thermography, were analyzed. The results indicated that the use of thermography as well as the asymmetry technique is useful in identifying hypoechoic as well as cystic masses. It should be noted that the patient should not suffer from breast discharge. Results: The accuracy of asymmetry technique identification is respectively 91/89% and 92/30%. Also the accuracy of the exact location of identification is on the 61/53% and 75%. The approach also proved effective in identifying heterogeneous lesions, fibroadenomas, and intraductal masses, but not ISO-echoes and calcified masses. Conclusions: According to the results of the investigation, thermography may be useful in the initial screening and supplementation of diagnostic procedures due to its safety (its non-radiation properties), low cost and the good recognition of breast tissue disease.

• 비파괴검사학회지
• /
• 제26권5호
• /
• pp.315-320
• /
• 2006

비접촉 비파괴 응력해석기술인 위상잠금 적외선 열화상기술 (Lock-in infrared Thermography)를 이용하여 V-노치와 원형노치를 갖는 평판의 응력분포해석과 피로한계치를 예측하였다. 반복하중을 받는 시험편의 표면온도 분포를 2차원 열화상으로 측정하고 열탄성효과에 의해 노치 선단에서 응력분포를 예측하였으며 재료의 비가역적 히스테리시스에 의해 발생하는 내재 분산에너지를 측정하여 노치시험편의 피로한계치를 예측하였다. 피로한계응력 이내에서 응력측정 결과는 10% 이내의 정확도를 보였으며, 원형노치와 V-노치 시험편의 피로한계치를 164 MPa과 185 MPa로 예측하였다.

• 비파괴검사학회지
• /
• 제33권4호
• /
• pp.349-354
• /
• 2013

적외선 열화상을 이용한 비파괴검사는 다양한 산업분야로 활용도가 확장중이다. 또한, 적외선 열화상을 이용한 용접부의 비파괴검사도 다양하게 진행중이다. 현재는 전기저항 점용접부의 비파괴검사는 방사선 검사를 주로 진행하고 있다. 본 연구는 광 적외선 열화상 비파괴검사를 이용하여 전기저항 점용접부의 용융부(너깃)의 영역을 측정하였다. 실험결과 펄스 적외선 열화상검사 방법을 활용할 경우 짧은 시간안에 명확한 용융부의 검출이 가능함을 확인하였다.

• Tribology and Lubricants
• /
• 제30권2호
• /
• pp.124-129
• /
• 2014

The piping system accounts for a large portion of the machinery structure of a plant, and is considered as a very important mechanical structure for plant safety. Accordingly, it is used in most energy plants in the nuclear, gas, and heavy chemical industries. In particular, the piping system for a nuclear plant is generally complicated and uses the reactor and its cooling system. The piping equipment is exposed to diverse loads such as weight, temperature, pressure, and seismic load from pipes and fluids, and is used to transfer steam, oil, and gas. In ultrasound infrared thermography, which is an active thermography technology, a 15-100 kHz ultrasound wave is applied to the subject, and the resulting heat from the defective parts is measured using a thermography camera. Because this technique can inspect a large area simultaneously and detect defects such as cracks and delamination in real time, it is used to detect defects in the new and renewable energy, car, and aerospace industries, and recently, in piping defect detection. In this study, ultrasound infrared thermography is used to detect information for the diagnosis of nuclear equipment and structures. Test specimens are prepared with piping materials for nuclear plants, and the optimally designed ultrasound horn and ultrasound vibration system is used to determine damages on nuclear plant piping and detect defects. Additionally, the detected images are used to improve the reliability of the surface and internal defect detection for nuclear piping materials, and their field applicability and reliability is verified.

• Korean Journal of Acupuncture
• /
• 제20권1호
• /
• pp.1-20
• /
• 2003

This study was examined for effects of acupuncture of Zusanli (ST36) on the abdominal thermography of health subject. The volunteers who participating in this study had taken rest for 20-30 mins in room temperature (23-$25^{\circ}C$) before the examination and informed them what to prohibit smoking, drinking and administration of drug for the previous day. The thermography of abdomen including a below part of the chest was taken using Infra-Red Imaging System (IR 2000, MEDI-CORE Co, Korea) by time interval of 15 minutes at 15 min before, just before and 15 min after, 30 min after and 45 min after acupuncture stimulation. Acupuncture was applied to the left ST36 acupoint for 30 mins. The results showed that acupuncture of ST36 significantly had more potencies of changes on all the of abdominal thermography than those of control group. Also, it was observed that the quantities of thermal changes following acupuncture of ST36 been increased significantly comparing that of control group at all the ROIs (region of interest). Observed the thermography classified by ROI, however, it was failed that acupuncture of ST36 could modulate the specific areas concerning to the abdominal pathway of Stomach Meridian. These results suggest that acupuncture of ST36 may modulate thermal distributions and changes of abdominal areas including the below of chest.