Terahertz detection and identification of defects in layered polymer composites and composite coatings

Łopato, Przemysław; Chady, Tomasz

doi:10.1080/10589759.2012.694882

Cited by 43 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, by the fact that changing the content of bentonite doesn't influence on the absorption coefficient of the biopolymer effectively but greatly affects its refractive index, the drug delivery system based on it can be fabricated with different refractive indices for different drugs accordingly, depending on whether the drug layer needs to be taken into account. According to the published researches [35][36][37], THz-TDS may distinguish the layers of polymeric materials by detecting the reflection of THz waves and has better resolution than other conventional ultrasonic and optical devices. Thus, the biopolymer may also be used as the potential substrate for in vivo THz measurements.…”

Section: Discussionmentioning

confidence: 99%

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

Zhang

Захарова

Vozianova

et al. 2020

J-BPE

View full text Add to dashboard Cite

With the fast development of terahertz technology in medical diagnosis and monitoring, it has become important to investigate the application of THz radiation in the cancer treatment assessment during the therapy. In this paper, a buccal drug delivery system is studied as the first step towards this application. The drug delivery system is based on a gelatin-starch biopolymer matrix filled with plasticizing glycerol and various contents of reinforcing particles of bentonite clay. The biopolymers were subjected to morphology analysis using optical microscopy, analysis of mechanical tensile properties, and analysis of terahertz optical properties, followed by a theoretical approach of the experiment. The results show a visible effect of the bentonite content on both of the mechanical and terahertz optical properties of the biopolymer. These findings allow us to confirm the feasibility of using THz radiation for cancer assessment during therapies. The proposed biopolymer also has the potential to be applied as a substrate when carrying out in-vivo optical property measurement of biotissue in terahertz frequency range.

show abstract

Section: Discussionmentioning

confidence: 99%

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

Zhang

Захарова

Vozianova

et al. 2020

J-BPE

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…In the past decade, terahertz (THz) radiation within the range of 0.1–3 THz has been used in a growing number of applications, including explosive detections [ 30 ], security screening [ 31 , 32 ], nondestructive evaluation [ 33 ], telecommunication [ 34 ] and biomedical investigations [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Terahertz radiation penetrates a variety of nonpolar non-conducting materials and is inherently safe for living tissues and DNA, because it is not ionizing thanks to low photon energy.…”

Section: Introductionmentioning

confidence: 99%

Towards Fingerprint Spoofing Detection in the Terahertz Range

Pałka

Kowalski

2020

Sensors

View full text Add to dashboard Cite

Spoofing attacks using imitations of fingerprints of legal users constitute a serious threat. In this study, a terahertz time domain spectroscopy (TDS) setup in a reflection configuration was used for the non-intrusive detection of fingerprint spoofing. Herein, the skin structure of the finger pad is described with a focus on the outermost stratum corneum. We identified and characterized five representative spoofing materials and prepared thin and thick finger imitations. The complex refractive index of the materials was determined in TDS in the transmission configuration. For dataset collection, we selected a group of 16 adults of various ages and genders. The reflection results were analyzed both in the time (reflected signal) and frequency (reflectivity) domains. The measured signals were positively verified with the theoretical calculations. The signals corresponding to samples differ from the finger-related signals, which facilitates spoofing detection. Thanks to deconvolution, we provide a basic explanation of the observed phenomena. We propose two spoofing detection methods, predefined time–frequency features and deep learning based. The methods achieved high true detection rates of 87.9% and 98.8%. Our results show that the terahertz technology can be successfully applied for spoofing detection with high detection probability.

show abstract

Terahertz detection and identification of defects in layered polymer composites and composite coatings

Cited by 43 publications

References 13 publications

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

Terahertz optical and mechanical properties of the gelatin-starch-glycerol-bentonite biopolymers

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Towards Fingerprint Spoofing Detection in the Terahertz Range

Contact Info

Product

Resources

About