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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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sensors-15-15903-f003: Design of device for testing.

Mentions: The MM lens has been realized with two CSRs having a large basis face to face (Figure 1). A CSR consists of a number of spiral wound layers of an insulated conductor on a conical mandrel. CSRs are tuned at 105 MHz frequency. The geometrical parameters of CSR are 20 mm base diameter, 3.2 mm top diameter, the aperture angle 20°, height of 55 mm and 3 turns made from 18 µm thickness copper foil adhesiveless laminated with 12 µm thickness polyimide foil (LONGLITE™200 produced by Rogers Corporation (Connecticut, CT, USA), in order to decrease the losses at high frequencies (Figure 3). The Swiss rolls act like MM allowing the transmission of the evanescent waves from the region between carbon fibers towards the reception coil placed in the focal image point, converting the localized energy in electromotive force (e.m.f.).


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

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

Design of device for testing.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-15903-f003: Design of device for testing.
Mentions: The MM lens has been realized with two CSRs having a large basis face to face (Figure 1). A CSR consists of a number of spiral wound layers of an insulated conductor on a conical mandrel. CSRs are tuned at 105 MHz frequency. The geometrical parameters of CSR are 20 mm base diameter, 3.2 mm top diameter, the aperture angle 20°, height of 55 mm and 3 turns made from 18 µm thickness copper foil adhesiveless laminated with 12 µm thickness polyimide foil (LONGLITE™200 produced by Rogers Corporation (Connecticut, CT, USA), in order to decrease the losses at high frequencies (Figure 3). The Swiss rolls act like MM allowing the transmission of the evanescent waves from the region between carbon fibers towards the reception coil placed in the focal image point, converting the localized energy in electromotive force (e.m.f.).

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