NDT Technology

NDT Technology

Using of Modulated Thermography for Nondestructive Testing of Polymer Plates

Document Type : Original Article

Authors
Reza Khoshkbary 1
Mohammadreza Farahani 1
Majid Safarabadi 1
Saeed Asghari 2
1 School of Mechanical Engineering, College of Engineering, University of Tehran
2 Associate Professor, Institute of materials and energy
10.30494/jndt.2019.95383
Abstract
Thermography is one of the new, fast and low-cost methods for nondestructive testing. In this method, the workpiece is subjected to heating under the modulated heat source, and the images of the process are stored by the thermal camera. In this research, the feasibility of this method was performed on a plastic cutter. The results showed that deeper and smaller defects are better identified in the image of the amplitude of the heat wave amplitude. It was also found that the quality of phase images is higher than the image of the domain and is less affected by the test conditions, such as asymmetric heating and light reflection. By optimizing the test conditions, the defects can be displayed with the use of domain images. Also, two different frequencies with a relatively high spacing of 0.5 Hz and 1 Hz were used to obtain a suitable frequency for the workpiece. Due to the appropriate heat transfer, lower frequency use in the test is recommended to provide a more appropriate time interval for detecting defects.
Keywords
Thermography
Modulated
Nondestructive Test
Defect
Polymer
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NDT Technology
Volume 2, Issue 4 - Serial Number 5
September 2019
Pages 38-45

  • Receive Date 02 January 2019
  • Revise Date 14 July 2019
  • Accept Date 15 July 2019