• Journal of the Korean Institute of Oriental Medical Informatics
• /
• v.19 no.1
• /
• pp.36-42
• /
• 2013

Background : The aim of this study is assessing the adaption of thermography for fatigue. Method : Thermography was accomplished in three group classified fatigue group with disease, fatigue group without disease, non-fitigue group without disease. Results : Temperatures of fatigue group with disease was lower than those of the other groups. Conclusion : Thermography can be used to diagnosing and assessing the fatigue patients.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.30 no.6
• /
• pp.558-563
• /
• 2010

In this paper, the novel approach for the fault diagnosis of the bearing equipped with rotational mechanical facilities was studied. As research works, by applying the ball bearing used extensively in many industrial fields, experiments were conducted in order to propose the new prognostic method about the condition monitoring for the rotational bodies based on the condition analysis of infrared thermography. Also, by using the vibration spectrum analysis, the real time monitoring was performed. As results, it was confirmed that infrared thermography method could be adapted into monitor and diagnose the fault for bearing by evaluating quantitatively and qualitatively the temperature characteristics according to the condition of the ball bearing.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.28 no.3
• /
• pp.273-278
• /
• 2008

In this paper, effects of thermoelastic stress by using lock-in thermography was measured in the cantilever beam. In experiment, a circular holed plate was applied to analyze variation of transient stress under the condition of repeated cyclic loading. And the finite element modal analysis as computational work was performed. According to the surface temperature obtained from infrared thermography, the stress of the nearby hole was predicted based on thermoelastic equation. As results, each stress distributions between 2nd and 3rd vibration mode were qualitatively and quantitatively investigated, respectively. Also, dynamic stress concentration factors according to the change of vibration amplitude were estimated for the resonance frequency.

• Nuclear Engineering and Technology
• /
• v.52 no.4
• /
• pp.856-862
• /
• 2020

Defect inspection system for industrial applications takes the important portion. Non-destructive inspection method has been significantly improved. Infrared thermography, as one of method for non-destructive inspection, can provide relatively precise data and quick inspection time. This study, it was performed to measure defect according to the measurement limit of the non-visible areas such as the back surface of the pipe using reflection plate using reflection plate based on Infrared thermography. The materials of the reflection plate were determined in consideration of the space limitation and the thermal characteristics, and defects were detected by the manufactured reflection plate. Detection of defect in non-visible area using the candidate materials for reflection plate was conducted.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.35 no.6
• /
• pp.398-406
• /
• 2015

This paper explored the results of experimental investigation on carbon fiber reinforced polymer (CFRP) composite sample with thermal wave technique. The thermal wave technique combines the advantages of both conventional thermal wave measurement and thermography using a commercial Infrared camera. The sample comprises the artificial inclusions of foreign material to simulate defects of different shape and size at different depths. Lock-in thermography is employed for the detection of defects. The temperature field of the front surface of sample was observed and analysed at several excitation frequencies ranging from 0.562 Hz down to 0.032 Hz. Four-point methodology was applied to extract the amplitude and phase of thermal wave's harmonic component. The phase images are analyzed to find qualitative and quantitative information about the defects.

• Korean Journal of Veterinary Research
• /
• v.42 no.2
• /
• pp.269-275
• /
• 2002

The aim of this study was to investigate the usefulness and effectiveness of thermography in horse. Total 21 horses associated with locomotors, wound, and ophthalmic disease were investigated. Thermographically, the wannest area in normal limb was coronary band ($27.26^{\circ}C$), and carpus, metacarpus, fetlock, and pastern area were $26.64^{\circ}C$, $24.42^{\circ}C$, $23.64^{\circ}C$ and $23.06^{\circ}C$, respectively. The temperature($^{\circ}C$) of horses with lameness, swelling, nervous, ataxia was lower(cold spot) than surrounding tissue or symmetry area, and with heat, signs of inflammation was increased(hot spot). These results suggest that the thermography is useful for the early detection of locomotors, wound, and ophthalmic disease in horse and an excellent adjunct to clinical examination.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2003.05a
• /
• pp.169-174
• /
• 2003

The purpose of this study is examine into the application of infrared thermography for voids detect in reinforced concrete structures. In this study, the experiments were carried out for analyze the effect of void size, cover, measurement time and distance on test piece which has artificial voids. Results of this study are as follows. Noiseless and high resolution thermography was acquired 11:00 - 14:00 and the thermography which taken 16:00 was not suitable for void detection. The difference of temperature between voids and solid to identification the existence of voids by eye is $0.3^{\circ}C$.

• 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.

• Structural Engineering and Mechanics
• /
• v.44 no.4
• /
• pp.417-429
• /
• 2012

Taking the superficial temperature increment as the major fatigue damage indicator, the infrared thermography was used to predict fatigue parameters (fatigue strength and S-N curve) of welded joints subjected to fatigue loading with a high mean stress, showing good predictions. The fatigue damage status, related to safety evaluation, was tightly correlated with the temperature field evolution of the hot-spot zone on the specimen surface. An energetic damage model, based on the energy accumulation, was developed to evaluate the residual fatigue life of the welded specimens undergoing cyclic loading, and a good agreement was presented. It is concluded that the infrared thermography can not only well predict the fatigue behavior of welded joints, but also can play an important role in health detection of structures subjected to mechanical loading.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.11a
• /
• pp.216-219
• /
• 2003

This paper presents the analyzing method for surface temperature distribution of a cast-resin transformer. For the study, the surface temperature of the transformer winding was measured and analyzed by a infrared thermography system. Alternating voltages were applied to simulate deterioration of the specimen transformer, and the hot-spot on the transformer surface was measured to analyze the condition for the winding. The hot line condition measured to the changes in surface temperature using infrared thermography camera and was set up the based of diagnostic method of the electric power apparatus. The results ould show the possibility of remote diagnosis using internet.