Terahertz spectroscopy approach of the fiber orientation influence on CFRP composite solid laminates

Park, Je-Woong; Im, Kwang Hee; Hsu, David K.; Jung, Jong-An; Yang, In Young

doi:10.1007/s12206-012-0513-5

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…The first one was used to calculate the time delay based on the optical path length difference and can be solved by Eq. (1): [17][18][19] …”

Section: Refractive Index and Absorption Coefficientmentioning

confidence: 99%

“…Redo-Sanchez and Karpowicz 15 and Karpowicz and Dawes 16 applied THz continuous and pulsed wave technology in reflection mode to detect burn damage of CFRP. Im et al 17,18 and Park and Im 19 investigated the electrical field characterization in conducting carbon fiber. Additionally, a reflective THz time-domain spectroscopy (TDS) system was utilized to evaluate polyphenylene sulfide CFRP solid laminate with different angles of orientation of the carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic study of terahertz reflection and transmission properties of carbon-fiber-reinforced plastic composites

Zhang

Shi

et al. 2015

Opt. Eng

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Abstract. Carbon-fiber-reinforced plastic (CFRP) composites are widely used in aerospace and concrete structure reinforcement due to their high strength and light weight. Terahertz (THz) time-domain spectroscopy is an attractive tool for defect inspection in CFRP composites. In order to improve THz nondestructive testing of CFRP composites, we have carried out systematic investigations of THz reflection and transmission properties of CFRP. Unidirectional CFRP composites with different thicknesses are measured with polarization directions 0 deg to 90 deg with respect to the fiber direction, in both reflection and transmission modes. As shown in the experiments, CFRP composites are electrically conducting and therefore exhibit a high THz reflectivity. In addition, CFRP composites have polarization-dependent reflectivity and transmissivity for THz radiation. The reflected THz power in the case of parallel polarization is nearly 1.8 times higher than for perpendicular polarization. At the same time, in the transmission of THz wave, a CFRP acts as a Fabry-Pérot cavity resulting from multiple internal reflections from the CFRP-air interfaces. Moreover, from the measured data, we extract the refractive index and absorption coefficient of CFRP composites in the THz frequency range. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…The first one was used to calculate the time delay based on the optical path length difference and can be solved by Eq. (1): [17][18][19] …”

Section: Refractive Index and Absorption Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of terahertz reflection and transmission properties of carbon-fiber-reinforced plastic composites

Zhang

Shi

et al. 2015

Opt. Eng

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“…Nevertheless, these sequential measurements can be prone to alignment errors, are time-consuming and are therefore less suited, e.g., for applications where large areas are investigated. This problem was overcome in a recent work [85], where a technique based on the fast mechanical rotation of an EO (110) crystal and lock-in detection was introduced, allowing for a fast and precise determination of the polarization direction of a THz wave. Thus, rotating the EO detector becomes suitable also for polarization imaging applications, as the authors proved in [86], where the method was applied for topographic measurements with extremely high axial resolution.…”

Section: Birefringence At Thz Frequenciesmentioning

confidence: 99%

“…PS-THz-TDS works also for thicker samples, with high potential especially for glass and natural fibers. Oriented carbon fiber (CF) reinforced materials were shown to be highly anisotropic, since the fibers are electrically conducting while the epoxy matrix is not, with the penetration depth strongly depending on the orientation of the fibers with regard to the THz polarization [108][109][110]. However, their conductivity restricts the penetration depth of the THz waves.…”

Section: Ps-thz Investigations Of Fibrous Materialsmentioning

confidence: 99%

“…However, their conductivity restricts the penetration depth of the THz waves. In [110], the skin depth of a unidirectional CFRP with a transverse conductivity of 10 S/m was estimated to be as low as 200 μm at 1 THz and 500 μm at 0.1 THz for the electric field oriented normal to the fiber axis, i.e., for the orientation with the highest penetration depth. Thus, the applicability of PS-THz measurements to the birefringence analysis of CF reinforced materials is limited.…”

Section: Ps-thz Investigations Of Fibrous Materialsmentioning

confidence: 99%

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Recent Advances in Birefringence Studies at THz Frequencies

Wiesauer

Jördens

2013

J Infrared Milli Terahz Waves

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In the last few years, various studies on terahertz (THz) birefringence have been presented, based on polarization-sensitive THz time-domain spectroscopy. The field of THz birefringence is a wide one covering several aspects, such as different materials exhibiting THz birefringence, polarization-sensitive THz technology, as well as numerous methods for extracting the birefringence properties of a sample from the THz data. Therefore, this paper aims at reviewing recent results on THz birefringence measurements presented in literature, addressing the above aspects and giving an overview of the topic. Moreover, it will focus on the investigation of birefringent fibrous samples, where specific results will be discussed in detail. Altogether, this paper should give a comprehensive view on the recent achievements in the measurements of THz birefringence.

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Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner

Hack

Neuenschwander

2015

Encyclopedia of Polymer Science and Technology

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Because of their unique properties, polymers and polymer–matrix composites pose both challenges and opportunities for nondestructive testing. The increasing use of these materials creates a demand for nondestructive verification of various properties or specifications, determination of structural integrity, or prediction of service‐life. On the other hand, development of new nondestructive test methods, improved sensitivity, or faster data acquisition and analysis may allow for nondestructive testing applications that hitherto did not seem feasible or economical. This article provides a brief overview of established methods and emerging applications in nondestructive testing of polymers and polymer–matrix composites.

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Terahertz spectroscopy approach of the fiber orientation influence on CFRP composite solid laminates

Cited by 11 publications

References 8 publications

Spectroscopic study of terahertz reflection and transmission properties of carbon-fiber-reinforced plastic composites

Spectroscopic study of terahertz reflection and transmission properties of carbon-fiber-reinforced plastic composites

Recent Advances in Birefringence Studies at THz Frequencies

Nondestructive Testing of Polymers and Polymer–Matrix Composites

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