In Introductory Review to THz Non-Destructive Testing of Composite Mater

Amenabar, Ibán; López, Fernando; Mendikute, A.

doi:10.1007/s10762-012-9949-z

Cited by 207 publications

(89 citation statements)

References 88 publications

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“…Such materials also include multilayer composite materials, which are opaque for visible and infrared light. Moreover, the analysis using THz radiation allows to determine thicknesses of internal layers and to define hidden defects and non-uniformities inside those materials [1][2][3]. It is worth noticing that THz radiation provides a non-destructive, non-ionizing, and contactless method for material evaluation.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, the UHMWPE composites have not been intensely studied in the THz range [12,13]. The non-destructive evaluation of composite materials [1][2][3][14][15][16] was mostly carried out by the use of THz time-domain spectroscopy (TDS). Nevertheless, there are many other techniques based, for example, on FMCW radar [17], CW imaging using quantum cascade lasers [18], a gas laser [9], or a Gunn diode [19].…”

Section: Introductionmentioning

confidence: 99%

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Precise Determination of Thicknesses of Multilayer Polyethylene Composite Materials by Terahertz Time-Domain Spectroscopy

Pałka

Krimi

Ospald

et al. 2015

J Infrared Milli Terahz Waves

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The multilayer structure of an ultra-high molecular weight polyethylene (UHMWPE) composite material was investigated in the terahertz (THz) spectral range by means of time-domain spectroscopy (TDS) technique. Such structures consist of many alternating layers of fibers, each being perpendicular to the other and each having a thickness of about 50 μm. Refractive indices of two composite samples and of a sample composed of four single layers (plies) having the same fiber orientation were determined for two orthogonal orientations of the electric field in a transmission TDS system. The birefringence of a single layer was measured, and the origin of this phenomenon is discussed. Using the TDS system in reflection, the formation of many pulses shifted in time was observed originating from reflections from interfaces of successive layers caused by the periodic modulation of the refractive index along the propagation of the THz radiation. This phenomenon is theoretically described and simulated by means of a transfer matrix method (TMM). A time-domain fitting procedure was used to determine thicknesses of all layers of the composite material. The reconstructed waveform based on the optimized thicknesses shows very good agreement with the measured waveform, with typical differences between measurements and simulations J Infrared Milli Terahz Waves (2015) between 3 and 7 μm (depending on the sample). As a result, we were able to determine the thicknesses of all layers of two multilayer (~200 plies) structures by means of the reflection TDS technology with high accuracy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precise Determination of Thicknesses of Multilayer Polyethylene Composite Materials by Terahertz Time-Domain Spectroscopy

Pałka

Krimi

Ospald

et al. 2015

J Infrared Milli Terahz Waves

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“…Many polymers are transparent to the wavelengths of 30 μm to 3 mm corresponding to the 0.1 to 10 THz range (200). Thus, terahertz testing can be applied in transmission or reflection as well as in scanning or imaging mode (201)(202)(203)(204). It has been applied to aircraft components (205), impact damage characterization (206), damage detection (207), fiber orientation (208), thickness measurement by terahertz pulsed imaging (209), and surface profiling by phase sensitive terahertz holography (210)…”

Section: Electromagnetic Test Methodsmentioning

confidence: 99%

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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“…However, the development of ultrafast laser technology and progress of semiconductor materials, has increased the efficiency and accuracy of THz technology. THz technology has been widely applied in the field of environmental science, physics, aerospace, security, biomedical, pharmaceutical and materials science [3][4][5][6][7][8][9]. Due to its unique properties, THz wave drew the attentions of researchers.…”

Section: Introductionmentioning

confidence: 99%

Application of Terahertz Spectroscopy and Imaging Techniques in Food Adulteration

Li¹,

Shi²,

Wang³

et al. 2017

dteees

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Abstract. Terahertz (THz) waves lie between millimeter and far-infrared bands, the frequency of which ranges from 100 GHz to 10 THz. Some food materials show featured absorption for THz wave radiation, which can be utilized to characterize different food materials. Compared with other spectral analysis methods, THz spectroscopy has low photon energy and no ionizing radiation. The rapid development of ultrafast laser technology and semiconductor material has enable the further progress of THz techniques in food adulteration. In this review, the principles and applications of THz technology employed in the detection of food adulteration are discussed and the challenges of THz technology in the field of food adulteration are also summarized.

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In Introductory Review to THz Non-Destructive Testing of Composite Mater

Cited by 207 publications

References 88 publications

Precise Determination of Thicknesses of Multilayer Polyethylene Composite Materials by Terahertz Time-Domain Spectroscopy

Precise Determination of Thicknesses of Multilayer Polyethylene Composite Materials by Terahertz Time-Domain Spectroscopy

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Application of Terahertz Spectroscopy and Imaging Techniques in Food Adulteration

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