• Proceedings of the KSR Conference
• /
• 2011.05a
• /
• pp.1109-1117
• /
• 2011

All objects emit infrared above absolute temperature 0K. Infrared thermography is one of the nondestructive testing technologies to measure the temperature of the object. Infrared thermography shows infrared image which in a longer wavelength than visible light. Infrared technology can be employed regardless of the type or state of the objects. Thus, infrared thermography technique has been used in a wide variety of manufacturing processes in areas such as mechanical, electrical, chemical and medical applications. The advancement of using infrared technology has been increasing. In this paper, the principle of lock-in infrared thermography and its applications were investigated, and the direction of future development was discussed.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.35 no.6
• /
• pp.407-413
• /
• 2015

Ultrasonic infrared thermography is an active thermography methods. In this method, mechanical energy is introduced to a structure, it is converted into heat energy at the defects, and an infrared camera detects the heat for inspection. The heat generation mechanisms are dependent on many factors such as structure characteristics, defect type, excitation method and contact condition, which make it difficult to predict heat distribution in ultrasonic infrared thermography. In this paper, a method to simulate frictional heating, known to be one of the main heat generation mechanisms at the closed defects in metal structures, is proposed for ultrasonic infrared thermography. This method uses linear vibration analysis results without considering the contact boundary condition at the defect so that it is intuitive and simple to implement. Its advantages and disadvantages are also discussed. The simulation results show good agreement with the modal analysis and experiment result.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.31 no.4
• /
• pp.335-341
• /
• 2005

This study discusses the effects of infrared thermography in dentistry. Infrared thermography allows the quantification of infrared rays and provides useful data for dental care and research. It has been used for the diagnosis of temporomandibular dysfunction (TMD) and proposed as an objective measure of myofascial pain. It is closely related to temperature and produces beneficial objective data. A study of the heat emissions from facial structures has the potential to benefit dental diagnosis of TMD, postoperative inferior alveolar damage, and endodontic and conservative treatments. In this paper, we assessed infrared thermography in dentistry and consider future developments of infrared thermography.

• Journal of Oriental Medical Thermology
• /
• v.8 no.1
• /
• pp.13-17
• /
• 2010

Purpose : This study is to the recent trends of clinical trial using infrared thermography and to review its application in medicine. Methods : We searched for papers which had used infrared thermography in Medicine within 5 years, using English. Results : A total of 23 papers were but 8 were found, but 8 were not related to non-invasive infrared thermography. The other 15 papers were clinical trials about the effect of acupuncture and therapeutic massage, evaluation of post-hepatic neuralgia, sleep disorder, and regional circulation. Conclusion : These results suggest that infrared thermography can be used as a reliable and helpful method in many clinical trials.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2005.05a
• /
• pp.511-514
• /
• 2005

Recently, to obtain the reliable data on the state of the structure, various non-destructive techniques are available. The infrared thermography technique is used in detection of cracks, flaws of concrete structures and buildings. In this paper the infrared thermography technique using the difference of surface temperature was studied. Also this paper is case study that the inspection of building's tile using infrared thermal video.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.32 no.3
• /
• pp.291-295
• /
• 2012

In the industrial field, real-time monitoring system like a fault early detection is very important. For this, the infrared thermography technique as a new diagnosis method is proposed. This study is focused on the damage detection and temperature characteristic analysis of ball bearing using the non-destructive infrared thermography method. In this paper, thermal image and temperature data were measured by a Cedip Silver 450 M infrared camera. Based on the results, the temperature characteristics under the conditions of normal, loss lubrication, damage, dynamic loading, and damage under loading were analyzed. It was confirmed that the infrared technique is very useful for the detection of the bearing damage.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.34 no.2
• /
• 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.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.32 no.3
• /
• pp.284-290
• /
• 2012

Infrared thermography uses infrared energy radiated from any objects above absolute zero temperature, and the range of its application has been constantly broadened. As one of the active test techniques detecting radiant energy generated when energy is applied to an object, ultrasound infrared thermography is a method of detecting defects through hot spots occurring at a defect area when 15~100 kHz of ultrasound is excited to an object. This technique is effective in detecting a wide range affected by ultrasound and vibration in real time. Especially, it is really effective when a defect area is minute. Therefore, this study conducted thermography through lock-in signal processing when an actual defect exists inside the austenite STS304 seamless pipe, which simulates thermal fatigue cracks in a nuclear power plant pipe. With ultrasound excited, this study could detect defects on the rear of a pipe by using an aluminium reflector. Besides, by regulating the angle of the aluminium reflector, this study could detect both front and rear defects as a single infrared thermography image.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.35 no.3
• /
• pp.185-192
• /
• 2015

Since real-time monitoring systems, such as early fault detection, have been very important, an infrared thermography technique was proposed as a new diagnosis method. This study focused on damage detection and temperature characteristic analysis of ball bearings using the non-destructive, infrared thermography method. In this paper, for the reliability assessment, infrared experimental data were compared with finite element analysis (FEA) results from ANSYS. In this investigation, the temperature characteristics of ball bearing were analyzed under various loading conditions. Finally, it was confirmed that the infrared thermography technique was useful for the real-time detection of damage to bearings.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.3 no.2
• /
• 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.