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Non-destructive evaluation of GFRP-wood sandwich structure composite using terahertz imaging
Author(s): Harikrishnan Kaimal; Nirmala Devi; Shaumik Ray; Prabhu Rajagopal; Krishnan Balasubramanian; Bala Pesala
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Paper Abstract

Engineering of novel structures with high strength to weight ratio for applications in aerospace, renewable energy and naval industries has resulted in an increased popularity of sandwich structured composites. A sandwich-structured composite is fabricated by bonding a thick lightweight core between two stiff, thin skins such as Glass Fiber Reinforced Plastic (GFRP). Balsawood is a type of homogeneous core which is widely used for renewable energy structures, such as wind turbine blades. In this paper, a GFRP-balsawood sandwich structure is evaluated non-destructively for internal defects such as holes, using a CW Terahertz system in transmission mode. Internal defects will give rise to differential THz transmission and hence can be identified using THz imaging. The imaging studies are carried out with a central frequency of 0.35 THz and the sample is raster scanned using 2-D translational stages controlled by high precision stepper motors in x-y directions to obtain the THz image. The image acquired using CW THz system clearly identifies the defects in the GFRP-balsawood composite structure with good contrast demonstrating the potential of THz imaging for non-destructive testing of sandwich composite structures.

Paper Details

Date Published: 23 February 2018
PDF: 7 pages
Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 105310D (23 February 2018); doi: 10.1117/12.2289718
Show Author Affiliations
Harikrishnan Kaimal, Indian Institute of Technology Madras (India)
Nirmala Devi, CSIR - Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research, CSIR-SERC (India)
Shaumik Ray, CSIR - Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research, CSIR-SERC (India)
Prabhu Rajagopal, Indian Institute of Technology Madras (India)
Krishnan Balasubramanian, Indian Institute of Technology Madras (India)
Bala Pesala, CSIR - Central Electronics Engineering Research Institute (India)
Academy of Scientific and Innovative Research, CSIR-SERC (India)


Published in SPIE Proceedings Vol. 10531:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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