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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
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Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 33, Issue 6 - Dec 2013
Volume 33, Issue 5 - Oct 2013
Volume 33, Issue 4 - Aug 2013
Volume 33, Issue 3 - Jun 2013
Volume 33, Issue 2 - Apr 2013
Volume 33, Issue 1 - Feb 2013
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Laser Lock-in Thermal Wave Imaging for Nondestructive Evaluation
An, Yun-Kyu ; Sohn, Hoon ; Kim, Ji Min ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 317~322
DOI : 10.7779/JKSNT.2013.33.4.317
This paper presents a new laser lock-in thermography (LLT) technique for nondestructive evaluation. LLT utilizes a modulated continuous wave laser beam as a heat source to obtain high fidelity thermal wave images even at the presence of background heat disturbances. The thermal waves propagating along the surface and through-the-thickness directions of a structure are visualized using newly developed laser lock-in amplitude and phase images, enhancing the detectability of surface and subsurface defects. The LLT technique is numerically investigated and experimentally validated using thermal images obtained from a steel specimen with low emissivity.
Application Angle of Defects Detection in the Pipe Using Lock-in Infrared Thermography
Yun, Kyung-Won ; Go, Gyeong-Uk ; Kim, Jin-Weon ; Jung, Hyun-Chul ; Kim, Kyung-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 323~329
DOI : 10.7779/JKSNT.2013.33.4.323
This perform research of angle rated defect detection conditions and nuclear power plant piping defect detection by lock-In infrared thermography technique. Defects were processed according to change for wall-thinning length, Circumference orientation angle and wall-thinning depth. In the used equipment IR camera and two halogen lamps, whose full power capacitany is 1 kW, halogen lamps and target pipe`s distance fixed 2 m. To analysis of the experimental results ensure for the temperature distribution data, by this data measure for defect length. Reliability of lock-In infrared thermography data is higher than Infrared thermography data. This through research, Shape of angle rated defect is identified industry place. It help various angles defect detection in the nuclear power plant in operation.
A Study on Real-Time Fault Monitoring Detection Method of Bearing Using the Infrared Thermography
Kim, Ho-Jong ; Hong, Dong-Pyo ; Kim, Won-Tae ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 330~335
DOI : 10.7779/JKSNT.2013.33.4.330
Since real-time monitoring system like a fault early detection has been very important, infrared thermography technique as a new diagnosis method was 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, for the reliability assessment, infrared experimental data were compared with the frequency data of the existing. As results, the temperature characteristics of ball bearing were analyzed under various loading conditions. Finally it was confirmed that the infrared technique was useful for real-time detection of the bearing damages.
Design and Performance Evaluation of Low-Temperature Vacuum Blackbody System
Kim, Ghiseok ; Chang, Ki Soo ; Lee, Sang-Yong ; Kim, Geon-Hee ; Kim, Dong-Ik ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 336~341
DOI : 10.7779/JKSNT.2013.33.4.336
In this paper, the design concept of a low-temperature vacuum blackbody was described, and thermophysical model of the blackbody was numerically evaluated. Also the working performance of low-temperature vacuum blackbody was evaluated using infrared camera system. The blackbody system was constructed to operate under high-vacuum conditions (
Pa) to reduce temperature uncertainty, which is caused by vapor condensation at low temperatures usually below 273 K. In addition, both heat sink and heat shield including cold shield were installed around radiator to prevent heat loss from the blackbody. Simplified mathematical model of blackbody radiator was analyzed using modified Stefan-Boltzmann`s rule. The infrared radiant performance of the blackbody was evaluated using infrared camera. Based on the results of measurements, and simulation, temperature stability of the low-temperature vacuum blackbody demonstrated that the blackbody system can serve as a highly stable reference source for the calibration of an infrared optical system.
Responsivity and Noise Evaluation of Infrared Thermal Imaging Camera
Kim, Dong-Ik ; Kim, Ghiseok ; Kim, Geon-Hee ; Chang, Ki Soo ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 342~348
DOI : 10.7779/JKSNT.2013.33.4.342
In this paper, the evaluation method for the responsivity and noise characteristics of an infrared thermal imaging camera was presented. Signal transfer function and noise equivalent temperature difference of the infrared thermal imaging camera were obtained by using a differential mode blackbody that is able to control the temperature difference
T between an infrared target and its background. And we verified the suitability of our evaluation method through comparison between the found noise equivalent temperature difference and the specification of the camera. In addition, the difference of 0.01 K of the two noise equivalent temperature differences calculated from with and without nonuniformity correction suggests that the nonuniformity correction is essential process for the evaluation of the infrared thermal imaging camera.
A Study on the Health Evaluation in Spot Welded Zone by Using Optical Pulse and Lock-in Phase Infrared Thermography
Park, Hee Sang ; Choi, Mang Yong ; Kwon, Koo Ahn ; Park, Jeong Hak ; Kim, Won Tae ; Lee, Bo Young ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 349~354
DOI : 10.7779/JKSNT.2013.33.4.349
The non-destructive testing using infrared thermography is extended to a variety of industries and non-destructive testing of welds using infrared thermography is also in progress in various ways. Currently, a non-destructive testing of electrical resistance spot welds which is mainly used is Radiography Testing. This study detected area of spot welds nugget using optical-infrared thermography. In the results, it is possible for detecting defects of nugget in a short period of time using pulse-infrared thermography.
On Diagnosis Measurement under Dynamic Loading of Ball Bearing using Numerical Thermal Analysis and Infrared Thermography
Hong, Dong-Pyo ; Kim, Ho-Jong ; Kim, Won-Tae ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 355~360
DOI : 10.7779/JKSNT.2013.33.4.355
With the modern machinery towards the direction of high-speed development, the thermal issues of mechanical transmission system and its components is increasingly important. Ball bearing is one of the main parts in rotating machinery system, and is a more easily damaged part. In this paper, bearing thermal fault detection is investigated in details Using infrared thermal imaging technology to the operation state of the ball bearing, a preliminary thermal analysis, and the use of numerical simulation technology by finite element method(FEM) under thermal conditions of the bearing temperature field analysis, initially identified through these two technical analysis, bearing a temperature distribution in the normal state and failure state. It also shows the reliability of the infrared thermal imaging technology. with valuable suggestions for the future bearing fault detection.
Application of Laser Ultrasonic Technique for Nondestructive Evaluation of Wall Thinning in Pipe
Hong, Kyung-Min ; Kang, Young-June ; Park, Nak-Kyu ; Yoon, Suk-Bum ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 361~367
DOI : 10.7779/JKSNT.2013.33.4.361
Many of the nuclear power plant pipe is used in high temperature and high pressure environment. Wall thinning frequently caused by the corrosion. These wall thinning in pipe is expected gradually increase as nuclear power become superannuated. Therefore there is need to evaluate wall thinning in pipe and corrosion defect by non-destructive method to prevent the accident of the nuclear power facility due to pipe corrosion. Especially for real-time assessment of the wall thinning that occurs in nuclear power plant pipe, the laser ultrasonic technology can be measured even in hard-to-reach areas, beyond the limits of earlier existing contact methods. In this study, the optical method using laser was applied for non-destructive and non-contact evaluation. Ultrasonic signals was acquired through generating ultrasonic by pulse laser and using laser interferometer. First the ultrasonic signal was detected in no wall thinning in pipe, then a longitudinal wave velocity was measured inside of pipe. Artificial wall thinning specimen compared to 20, 30, 40 and 50% of thickness of the pipe was produced and the longitudinal wave velocity was measured. It was possible to evaluate quantitatively the wall thinning area(internal defect depth) cause it was able to calculate the thickness of each specimen using measured longitudinal wave velocity.
Development of the Phased Array Ultrasonic Testing Technique for Nuclear Power Plant`s Small Bore Piping Socket Weld
Yoon, Byung-Sik ; Kim, Yong-Sik ; Lee, Jeong-Seok ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 368~375
DOI : 10.7779/JKSNT.2013.33.4.368
Failure of small bore piping welds is a recurring problem at nuclear power plants. And the socket weld cracking in small bore piping has caused unplanned plant shutdowns for repair and high economic impact on the plants. Consequently, early crack detection, including the detection of manufacturing defects, is of the utmost importance. Until now, the surface inspection methods has been applied according to ASME Section XI requirements. But the ultrasonic inspection as a volumetric method is also applying to enforce the inspection requirement. However, the conventional manual ultrasonic inspection techniques are used to detect service induced fatigue cracks. And there was uncertainty on manual ultrasonic inspection because of limited access to the welds and difficulties with contact between the ultrasonic probe and the OD(outer diameter) surface of small bore piping. In this study, phased array ultrasonic inspection technique is applied to increase inspection speed and reliability. To achieve this object, the 3.5 MHz phased array ultrasonic transducer are designed and fabricated. The manually encoded scanner was also developed to enhance contact conditions and maintain constant signal quality. Additionally inspection system is configured and inspection procedure is developed.
Improvement Effects on Lock-in Thermography by Iterative Adaption in Optical Excitation
Kim, Won Tae ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 376~381
Microscopy Infrared Thermography Systems and Applications
Park, Heesang ; Choi, Manyong ; Lee, Jaejung ; Bremond, Pierre ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 382~387
Nondestructive Evaluation for Safety Assessment on Power-Generating Structures Using Instrumented Indentation Technique
Kwon, Dongil ;
Journal of the Korean Society for Nondestructive Testing, volume 33, issue 4, 2013, Pages 388~393