Abstract
An infrared (IR) temperature sensor module developed for the detection ofdefects in a metal plate is modified for defect detection in a pipe. A module giving closesensor arrangement and maintaining a constant distance between sensor and measuredobject is developed and utilized in the present modification of the IR thermographic device.The defect detection performance is experimentally investigated, and the measuredtemperature is compared with the computed temperature distribution and with a previousexperimental result. The outcome of this experiment indicates that detection of a simulateddefect is readily obtainable, and the measured temperature distribution is better for defectdetection than with the previously utilized device. The comparison of standard deviations ofdifferent sensors clearly indicates an improvement in the location of defects in this study.Also, the measured temperature distribution is comparable to the one calculated using a heatconduction equation. The device developed for defect detection here is suitable forimplementation in chemical processes, where most vessels and piping systems arecylindrical in shape.
Highlights
Concealed defects and cracks in metallic objects may give rise to serious consequences leading to equipment failure, but these can be difficult to locate just using a simple testing device
For the performance evaluation of the proposed detection device three different settings of temperature distribution on the pipe were applied, and the surface temperature was measured while the pipe was rotated
An IR thermographic device for the detection of a groove in a metal plate was modified for cylindrical objects
Summary
Concealed defects and cracks in metallic objects may give rise to serious consequences leading to equipment failure, but these can be difficult to locate just using a simple testing device. Thermographic defect detection systems have come to be widely applied in the detection of defects in various materials. Such systems are utilized in the inspection of composite materials [1,2,3], aerospace materials [4], laminated wood [5], and thermal barrier coating [6]. They have been used in the inspection of manufacturing defects in polystyrene and a plaster [7]. The effect of defect size on IR thermographic detection has been examined by means of numerical computation [10,11]
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