Eddy Current Technique Based on ${\rm HT}_{\rm c}$-SQUID and GMR Sensors for Non-Destructive Evaluation of Fiber/Metal Laminates

Bonavolontà, C.; Valentino, M.; Marrocco, N.; Pepe, G. P.

doi:10.1109/tasc.2009.2019197

Cited by 22 publications

(7 citation statements)

References 14 publications

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“…Alternately, ECT probes that are operated in hybrid mode have been developed to overcome those limitations. As shown in Figure 20 , hybrid ECT techniques employ conventional or planar coils to generate eddy currents and utilize magnetic field sensors to directly measure field variations associated with discontinuities [ 26 , 72 ].…”

Section: Factors Affecting the Eddy Current Testing Inspectionmentioning

confidence: 99%

Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

Rifai

Abdalla

Ali

et al. 2016

Sensors

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Non-destructive eddy current testing (ECT) is widely used to examine structural defects in ferromagnetic pipe in the oil and gas industry. Implementation of giant magnetoresistance (GMR) sensors as magnetic field sensors to detect the changes of magnetic field continuity have increased the sensitivity of eddy current techniques in detecting the material defect profile. However, not many researchers have described in detail the structure and issues of GMR sensors and their application in eddy current techniques for nondestructive testing. This paper will describe the implementation of GMR sensors in non-destructive testing eddy current testing. The first part of this paper will describe the structure and principles of GMR sensors. The second part outlines the principles and types of eddy current testing probe that have been studied and developed by previous researchers. The influence of various parameters on the GMR measurement and a factor affecting in eddy current testing will be described in detail in the third part of this paper. Finally, this paper will discuss the limitations of coil probe and compensation techniques that researchers have applied in eddy current testing probes. A comprehensive review of previous studies on the application of GMR sensors in non-destructive eddy current testing also be given at the end of this paper.

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Section: Factors Affecting the Eddy Current Testing Inspectionmentioning

confidence: 99%

Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

Rifai

Abdalla

Ali

et al. 2016

Sensors

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“…Ultrasonic set-ups are usually used for post-manufacturing quality check. Ultrasonic pulse echo, ultrasonic phased array and eddy current testing are effective in detecting small cracks, pores and delamination, but they are just suitable for small parts of the analysis, and are not convenient for large areas of analysis [1][2][3]. Transient thermal imaging technology is a popular accepted technique for large area detection can be done quickly and without contact, and because real images of defects can be easily recorded and analyzed in [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The infrared thermal wave imaging detection of micro-crack defects in Ti-Al alloy plate

Zhang

Liu

et al. 2019

THERM SCI

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The Ti-Al alloy has good physical, chemical and mechanical properties, and it is the preferred material in aerospace and other special fields. The laser spots array is used for thermal excitation of the Ti-Al alloy specimen. Based on the fractional differential equation and Fourier heat conduction equation, the fractional heat transfer model of Ti-Al alloy plate specimen ex-cited by short pulse laser spots array is established, and the infrared thermal imaging simulation analysis is carried out by finite element method. The effects of crack width, crack depth and the distance between the crack and its nearest laser spot center on temperature abrupt jump is analyzed. With the increase of crack width and depth, the temperature abrupt jump increases, but the trend gradually slows down. The distance between the crack and its nearest laser spot center has a significant effect on the temperature abrupt jump. With the increase of the distance, the temperature abrupt jump first increases and then decreases. When the distance equals the laser spot radius, that is, the crack is tangent to the spot, the temperature abrupt jump reaches its maximum.

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“…For relatively small frequencies, (<1 GHz), the incident electromagnetic field is created by a coil crossed by an alternative electric current [ 26 ] or pulsed currents [ 27 ], the detection of electromagnetic fields created by the secondary source being achieved by using coils of different shapes [ 28 ]. For low frequencies, the detection of the secondary electromagnetic field can be obtained with sensors with Hall effect and GMR sensors or SQUID [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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

Savin

Steigmann

Bruma

et al. 2015

Sensors

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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.

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Eddy Current Technique Based on ${\rm HT}_{\rm c}$-SQUID and GMR Sensors for Non-Destructive Evaluation of Fiber/Metal Laminates

Cited by 22 publications

References 14 publications

Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

Giant Magnetoresistance Sensors: A Review on Structures and Non-Destructive Eddy Current Testing Applications

The infrared thermal wave imaging detection of micro-crack defects in Ti-Al alloy plate

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

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