MODELING OF TERAHERTZ RAY SIGNALS FOR NDE APPLICATIONS

2008 ◽  
Author(s):  
Chien-Ping Chiou ◽  
R. Bruce Thompson ◽  
James L. Blackshire ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Terahertz Ray

Coating Thickness Characterization of Composite Materials Using Terahertz Waves

2016 ◽  
Vol 878 ◽  
pp. 70-73 ◽  
Author(s):  
Kwang Hee Im ◽  
Sun Kyu Kim ◽  
David K. Hsu ◽  
Jong An Jung
Keyword(s):  
Refractive Index ◽  
Coating Thickness ◽  
Composite Laminates ◽  
Electromagnetic Properties ◽  
Terahertz Waves ◽  
Reflection Mode ◽  
Cfrp Composite ◽  
Spectroscopy System ◽  
Terahertz Ray

Recently, terahertz ray imaging has emerged as one of the most promising new powerful nondestructive evaluation (NDE) techniques for the area applications. In this study, a new time-domain spectroscopy system was utilized for measuring the coating thickness on CFRP composite laminates. Extensive experimental measurements in reflection mode were made to map out the T-ray images. Also, the refractive index was estimated based on the electromagnetic properties. The CFRP composite laminates were observed in reflection mode and limitations will be discussed in the T-ray processing. By using these characterized material properties, the characteristics was successfully demonstrated for T-ray behavior propagating through the Shim Stock films for acquiring the refractive index. The T-ray technique has been developed for the measurement of the thickness of the Shim Stock films and the coating thickness on CFRP composites. Good results have been obtained in tests made on the thickness of the standard film samples with the coating thickness ranging from around hundreds of μm.

Terahertz Ray Nondestructive Characterizations in FRP Composites

2010 ◽  
Vol 123-125 ◽  
pp. 839-842 ◽  
Author(s):  
Je Woong Park ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Chien Ping Chiou ◽  
Daniel J. Barnard
Keyword(s):  
Composite Laminates ◽  
Electromagnetic Properties ◽  
Reflection Mode ◽  
Frp Composites ◽  
Frp Composite ◽  
Application Systems ◽  
Spectroscopy System ◽  
Terahertz Ray ◽  
Characterization Procedure ◽  
Good Agreement

Recently, terahertz ray imaging has emerged as one of the most promising new powerful nondestructive evaluation (NDE) techniques, and new application systems are under processing development for the area applications. In this study, a new time-domain spectroscopy system was utilized for detecting and evaluating layup effect and flaw in FRP composite laminates. Extensive experimental measurements in reflection mode were made to map out the T-ray images. Especially in this characterization procedure, we estimated the electromagnetic properties such as the refractive index. Estimates of properties are in good agreement with known data. Furthermore layup effect and flaw of FRP composite laminates were observed in reflection mode and limitations will be discussed in the T-ray processing.

T-Ray NDE Inspections on the Fiber Direction of Thermoplastic PPS-Based CFRP Composites

2013 ◽  
Vol 650 ◽  
pp. 253-257 ◽  
Author(s):  
Kwang Hee Im ◽  
David K. Hsu ◽  
Chien Ping Chiou ◽  
Daniel J. Barnard
Keyword(s):  
Time Domain ◽  
Composite Laminates ◽  
Index Of Refraction ◽  
Fiber Direction ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Frp Composite ◽  
Application Systems ◽  
Conducting Materials ◽  
Terahertz Ray

Terahertz ray (T-ray) imaging has been emerged as one of the most promising new powerful nondestructive evaluation (NDE) techniques, and new application systems are under processing development for the area applications. The terahertz time domain spectroscopy (THz TDS) can be considered as a useful tool using general non-conducting materials; however it is quite limited to conducting materials. In this study, a new time-domain spectroscopy system was utilized for detecting and evaluating layup effect and flaw in FRP composite laminates. In order to solve various material properties, the index of refraction (n) and the absorption coefficient (α) are derived in reflective and transmission configuration using the terahertz time domain spectroscopy. However, the T-ray is limited in order to penetrate a conducting material to some degree. So, investigation of terahertz time domain spectroscopy (THz TDS) was made and reflection and transmission configurations were studied for a 48-ply thermoplastic PPS (poly-phenylene sulfide)-based CFRP solid laminate.

scholarly journals TERAHERTZ RAY SYSTEM CALIBRATION AND MATERIAL CHARACTERIZATIONS

2009 ◽  
Author(s):  
Chien-Ping Chiou ◽  
James L. Blackshire ◽  
R. Bruce Thompson ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
System Calibration ◽  
Terahertz Ray

Processing Terahertz Ray Data in Space Shuttle Inspection

2007 ◽  
Author(s):  
Chien-Ping Chiou ◽  
R. Bruce Thompson ◽  
William P. Winfree ◽  
Eric I. Madaras ◽  
Jeffrey Seebo
Keyword(s):  
Space Shuttle ◽  
Terahertz Ray

scholarly journals Terahertz Ray Imaging: A New Ray of Hope in Imaging Science

2014 ◽  
Vol 1 (1) ◽  
pp. 51
Author(s):  
Devika R. Krishnan
Keyword(s):  
Structural Properties ◽  
Imaging Modalities ◽  
Dental Tissue ◽  
Imaging Technology ◽  
Research Activities ◽  
Imaging Science ◽  
Terahertz Ray ◽  
New Research ◽  
Physical And Chemical ◽  
Roentgen Rays

Imaging technology is becoming increasingly prevalent in our society.Even though there were many successful imaging modalities ever since the advent of roentgen rays, they all have their shortcomings. And imaging of dental tissue had always been a challenge in imaging science due to the various layers which differ in physical and chemical and structural properties. Considerable improvisations of existing techniques and new research activities.

Nondestructive and noncontact evaluation on FRP composite laminates using a terahertz ray

2012 ◽  
Author(s):  
Je-Woong Park ◽  
Kwang-Hee Im ◽  
David K. Hsu ◽  
Chien-Ping Chiou ◽  
Dan Barnard ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Frp Composite ◽  
Terahertz Ray
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