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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.


Related in: MedlinePlus

Sample impacted with 12 J energy: (a) front side; (b) back side—inset: breaking of fibers.
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sensors-15-15903-f007: Sample impacted with 12 J energy: (a) front side; (b) back side—inset: breaking of fibers.

Mentions: In Figure 7, images of both the plate faces impacted with 12 J energy are presented. Monitoring the strain in the transverse direction of FRPC in a laminate configuration is indeed an essential issue. In such structures, reinforcement fibers enhance the mechanical strength of composite in the plane of the structure but they suffer from fragility in the transverse direction.


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

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

Sample impacted with 12 J energy: (a) front side; (b) back side—inset: breaking of fibers.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-15903-f007: Sample impacted with 12 J energy: (a) front side; (b) back side—inset: breaking of fibers.
Mentions: In Figure 7, images of both the plate faces impacted with 12 J energy are presented. Monitoring the strain in the transverse direction of FRPC in a laminate configuration is indeed an essential issue. In such structures, reinforcement fibers enhance the mechanical strength of composite in the plane of the structure but they suffer from fragility in the transverse direction.

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