scholarly journals Nondestructive evaluation of aircraft composites using transmissive terahertz time domain spectroscopy

2008 ◽  
Vol 16 (21) ◽  
pp. 17039 ◽  
Author(s):  
Christopher D. Stoik ◽  
Matthew J. Bohn ◽  
James L. Blackshire
Keyword(s):  
Nondestructive Evaluation ◽  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Aircraft Composites

scholarly journals Terahertz Wave Approach and Application on FRP Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Kwang-Hee Im ◽  
David K. Hsu ◽  
Chien-Ping Chiou ◽  
Daniel J. Barnard ◽  
Jong-An Jung ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Nondestructive Evaluation ◽  
Carbon Fibers ◽  
Time Domain ◽  
Index Of Refraction ◽  
Polyphenylene Sulfide ◽  
Fiber Axis ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Cfrp Composites

Terahertz (THz) applications have emerged as one of the most new powerful nondestructive evaluation (NDE) techniques. A new T-ray time-domain spectroscopy system was utilized for detecting and evaluating orientation influence in carbon fiber-reinforced plastics (CFRPs) composite laminates. Investigation of terahertz time-domain spectroscopy (THz-TDS) was made, and reflection and transmission configurations were studied as a nondestructive evaluation technique. Here, the CFRP composites derived their excellent mechanical strength, stiffness, and electrical conductivity from carbon fibers. Especially, the electrical conductivity of the CFRP composites depends on the direction of unidirectional fibers since carbon fibers are electrically conducting while the epoxy matrix is not. In order to solve various material properties, the index of refraction (n) and the absorption coefficient (α) are derived in reflective and transmission configurations using the terahertz time-domain spectroscopy. Also, for a 48-ply thermoplastic polyphenylene-sulfide-(PPS-) based CFRP solid laminate and nonconducting materials, the terahertz scanning images were made at the angles ranged from0°to180°with respect to the nominal fiber axis. So, the images were mapped out based on the electrical field (E-field) direction in the CFRP solid laminates. It is found that the conductivity (σ) depends on the angles of the nominal axis in the unidirectional fiber.

Nondestructive Evaluation of Rubber Compounds by Terahertz Time-Domain Spectroscopy

2011 ◽  
Vol 32 (12) ◽  
pp. 1457-1463 ◽  
Author(s):  
Yasuyuki Hirakawa ◽  
Yoshitomo Ohno ◽  
Toyohiko Gondoh ◽  
Tetsuo Mori ◽  
Kei Takeya ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Rubber Compounds

Nondestructive evaluation of glass fiber honeycomb sandwich panels using reflective terahertz imaging

2017 ◽  
Vol 21 (4) ◽  
pp. 1211-1223 ◽  
Author(s):  
Jin Zhang ◽  
Jiandong Chen ◽  
Jie Wang ◽  
Jinpeng Lang ◽  
Jinbo Zhang ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Glass Fiber ◽  
Time Domain ◽  
Sandwich Panels ◽  
Terahertz Imaging ◽  
Transport Systems ◽  
Terahertz Time Domain Spectroscopy ◽  
Foreign Inclusion ◽  
Time Domain Spectroscopy ◽  
Honeycomb Sandwich

The glass fiber honeycomb sandwich panel is an efficient structural configuration which has been widely used in several designs related to air, sea, and land transport systems. Terahertz time domain spectroscopy technology is an effective supplementary method for nondestructive evaluation of composites. Terahertz time domain spectroscopy imaging technology in the reflection configuration was employed to detect the defects of glass fiber honeycomb sandwich panels, such as a skin-core debonding and a foreign inclusion. It was shown in systematic experimental investigation that different defects were detected through terahertz imaging based on different parameters, which were obtained by comparing and analyzing the waveforms in time and/or frequency domain between normal and defective regions of the sample.

Sign in / Sign up

Export Citation Format

Share Document