A low-cost thermographic device for the detection of concealed groove in metal plate

Heo

Suh

et al. 2008

Sensors

Infrared temperature sensors, simple device for temperature measurement, have been modified for the measurement of temperature distribution on the metal surface in a way of nondestructive detection of defects of the object. In this study, the IR sensor system is utilized for the defect detection in a cylinder with one point heating, and the performance of the system is examined with an aluminum cylinder having a simulated defect. In addition, a 3-D conduction equation is numerically solved to compare the computed temperature profile with the measured one. The experimental outcome indicates that the defect detection is readily available with the proposed device and the point heating is practical for the applications of the defect detection. It is also found that the measured temperature distribution is comparable to the computed result from the conduction equation.

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Simulated Defect Using IR Temperature Sensors and One Point Heating

Heo

Suh

et al. 2008

Sensors

“…In the previous applications of the IR thermometers for the defect detection [3,4] a uniform heating was utilized, but the heating is difficult to apply in a practical implementation. As demonstrated in this study, the point heating on a localized spot in a vessel wall is more practical than the uniform heating and is effective to detect a defect.…”

Section: Resultsmentioning

confidence: 99%

Defect detection in a cylinder using an IR thermographic device and point heating

Jeong

2007 International Conference on Control, Automation and Systems

2007

An infrared temperature sensor is a simple device for temperature measurement, and has been modified for measuring temperature distribution of metal surface in a way of nondestructive detection of defects in metal objects. In this study, the IR sensor application is modified for the defect detection in a cylinder with one point heating, more convenient than uniform heating as applied in the previous studies. The experimental outcome with the proposed technique indicates that the detection of a simulated defect is possible and the point heating is more practical than the uniform heating for the field apphcation. It is also found that the measured temperature distribution is comparable to the computational result from a heat conduction equation.

“…When the sensor measures the groove temperature, a lower temperature is detected as demonstrated in the third curve of Figure 4 . A comparison of measured and computed temperatures in a rectangular plate has been conducted, yielding a similar outcome [ 12 ]. For further performance evaluation, the experimental measurements were carried out with two more temperature distributions in the pipe.…”

Section: Resultsmentioning

confidence: 99%

“…It also has the merits of low cost and ready availability. As proof of their effectiveness, IR thermometers have been employed to locate a concealed groove in a metal plate as small as 1 mm wide [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Application of an IR Thermographic Device for the Detection of a Simulated Defect in a Pipe

Joung

2006

Sensors

An infrared (IR) temperature sensor module developed for the detection of defects in a metal plate is modified for defect detection in a pipe. A module giving close sensor arrangement and maintaining a constant distance between sensor and measured object is developed and utilized in the present modification of the IR thermographic device. The defect detection performance is experimentally investigated, and the measured temperature is compared with the computed temperature distribution and with a previous experimental result. The outcome of this experiment indicates that detection of a simulated defect is readily obtainable, and the measured temperature distribution is better for defect detection than with the previously utilized device. The comparison of standard deviations of different 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 heat conduction equation. The device developed for defect detection here is suitable for implementation in chemical processes, where most vessels and piping systems are cylindrical in shape.