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An Electromagnetic Sensor with a Metamaterial Lens for Nondestructive Evaluation of Composite Materials.

Savin A, Steigmann R, Bruma A, Šturm R - Sensors (Basel) (2015)

Bottom Line: These structures can serve as electromagnetic flux concentrators in the radiofrequency range.The evaluation method is based on the appearance of evanescent modes in the space between carbon fibers when the sample is excited with a transversal magnetic along z axis (TMz) polarized electromagnetic field.The flaws can be localized with spatial resolution better than λ/2000.

View Article: PubMed Central - PubMed

Affiliation: Nondestructive Testing Department, National Institute of R&D for Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania. asavin@phys-iasi.ro.

ABSTRACT
This paper proposes the study and implementation of a sensor with a metamaterial (MM) lens in electromagnetic nondestructive evaluation (eNDE). Thus, the use of a new type of MM, named Conical Swiss Rolls (CSR) has been proposed. These structures can serve as electromagnetic flux concentrators in the radiofrequency range. As a direct application, plates of composite materials with carbon fibers woven as reinforcement and polyphenylene sulphide as matrix with delaminations due to low energy impacts were examined. The evaluation method is based on the appearance of evanescent modes in the space between carbon fibers when the sample is excited with a transversal magnetic along z axis (TMz) polarized electromagnetic field. The MM lens allows the transmission and intensification of evanescent waves. The characteristics of carbon fibers woven structure became visible and delaminations are clearly emphasized. The flaws can be localized with spatial resolution better than λ/2000.

No MeSH data available.


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The frequency dependence of effective permeability of conical Swiss roll.
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sensors-15-15903-f002: The frequency dependence of effective permeability of conical Swiss roll.

Mentions: If we consider an electromagnetic sensor with MM lens having f = l = 55 mm, in front of which a conductive screen having a circular aperture with diameter d = 100 µm is placed, the effective permeability of the lens presents a maximum at 105 MHz (Figure 2). The frequency range for which the effective permeability is negative is extremely narrow, as observed in Figure 2. The effective permeability and permittivity can be determined by measuring reflection and transmission coefficients for normal incidence of the electromagnetic wave to material slab [55]: (8)S11=RS21=Texp(jKd) when R and T are reflection and respective transmission coefficient.


An Electromagnetic Sensor with a Metamaterial Lens for Nondestructive Evaluation of Composite Materials.

Savin A, Steigmann R, Bruma A, Šturm R - Sensors (Basel) (2015)

The frequency dependence of effective permeability of conical Swiss roll.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541860&req=5

sensors-15-15903-f002: The frequency dependence of effective permeability of conical Swiss roll.
Mentions: If we consider an electromagnetic sensor with MM lens having f = l = 55 mm, in front of which a conductive screen having a circular aperture with diameter d = 100 µm is placed, the effective permeability of the lens presents a maximum at 105 MHz (Figure 2). The frequency range for which the effective permeability is negative is extremely narrow, as observed in Figure 2. The effective permeability and permittivity can be determined by measuring reflection and transmission coefficients for normal incidence of the electromagnetic wave to material slab [55]: (8)S11=RS21=Texp(jKd) when R and T are reflection and respective transmission coefficient.

Bottom Line: These structures can serve as electromagnetic flux concentrators in the radiofrequency range.The evaluation method is based on the appearance of evanescent modes in the space between carbon fibers when the sample is excited with a transversal magnetic along z axis (TMz) polarized electromagnetic field.The flaws can be localized with spatial resolution better than λ/2000.

View Article: PubMed Central - PubMed

Affiliation: Nondestructive Testing Department, National Institute of R&D for Technical Physics, 47 D. Mangeron Blvd, 700050 Iasi, Romania. asavin@phys-iasi.ro.

ABSTRACT
This paper proposes the study and implementation of a sensor with a metamaterial (MM) lens in electromagnetic nondestructive evaluation (eNDE). Thus, the use of a new type of MM, named Conical Swiss Rolls (CSR) has been proposed. These structures can serve as electromagnetic flux concentrators in the radiofrequency range. As a direct application, plates of composite materials with carbon fibers woven as reinforcement and polyphenylene sulphide as matrix with delaminations due to low energy impacts were examined. The evaluation method is based on the appearance of evanescent modes in the space between carbon fibers when the sample is excited with a transversal magnetic along z axis (TMz) polarized electromagnetic field. The MM lens allows the transmission and intensification of evanescent waves. The characteristics of carbon fibers woven structure became visible and delaminations are clearly emphasized. The flaws can be localized with spatial resolution better than λ/2000.

No MeSH data available.


Related in: MedlinePlus