Eddy Current Testing Probe Based on Double-Coil Excitation and GMR Sensor

Bernieri, Andrea; Ferrigno, Luigi; Laracca, Marco; Rasile, Antonio

doi:10.1109/tim.2018.2890757

Cited by 47 publications

(13 citation statements)

References 19 publications

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“…As the ECT probe's capability and accuracy for defect detection correlate with the noise level of eddy current signals, one main objective in the ECT probe design is to achieve an output with high signal-to-noise ratio (SNR) [8][9][10]. This can be achieved by improving the probe coil configurations and excitation modes, examples of which have been extensively reported in previous studies [2,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Wang

Deng

2020

Sensors

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This paper presents a rotating focused field eddy-current (EC) sensing technique, which leverages the advantages of magnetic field focusing and rotating magnetic field, for arbitrary orientation defects detection. The sensor consists of four identical excitation coils orthogonally arranged in an upside-down pyramid configuration and a giant magneto-resistive (GMR) detection element. The four coils are connected to form two figure-8-shaped focusing sub-probes, which are fed by two identical harmonic currents with 90 degrees phase difference. A finite element model-based study of arbitrary orientation defects detection was performed to understand the probe operational characteristics and optimize its design parameters. Probe prototyping and experimental validation were also carried out on a carbon steel plate specimen with four prefabricated surface-breaking defects. In-situ spot inspection with the probe rotating above the defect and a manual line-scan inspection were both conducted. Results showed that the probe has the capability of detecting defects with any orientations while maintaining the same sensitivity and the defect depth can be quantitatively evaluated by using the signal amplitude. Compared with the existing rotating field probes, the presented probe does not require additional excitation adjustment or data fusion. Meanwhile, due to its focusing effect, it can generate a strong rotating magnetic field at the defect location with a weak background noise, thus yielding superior signal-to-noise ratio.

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Section: Introductionmentioning

confidence: 99%

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Wang

Deng

2020

Sensors

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“…While for the methods using cavity resonance technique [18], [19], SRRs [13], [20], [21], and open-ended waveguide slit [22], [23], the spatial resolution could be high but the cost will increase due to higher working frequency, complex fabrication process or measurement setup. For the H-field-based RF NDE methods mentioned in [24]- [29], recent progresses from [26], [28] could detect single thin crack with width equals to 0.1 mm on a bare metal plate, but the sensor size falls in the range of more than few millimeters, which means the spatial resolution is not enough to distinguish errors in the complex PCBA environment.…”

Section: Comparison To the Existing Solutionsmentioning

confidence: 99%

“…There are mainly two types of excitation mechanisms for ECT, which are AC eddy current signal [24]- [28] and pulse eddy current (PEC) signal [29]. There are three major types of probing techniques, coil probe [24], [25], giant magneto-resistance (GMR) probe [26]- [28], and the hall sensor [29]. In general, the ECT does not have enough spatial resolution to distinguish errors on different pins of an IC package for example and is not suitable for complex structures such as PCBAs.…”

Section: Introductionmentioning

confidence: 99%

A Compact High-Resolution Resonance-Based Capacitive Sensor for Defects Detection on PCBAs

2020

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“…Giant magnetoresistive (GMR) sensors have been widely used in industry and daily life since the GMR effect was discovered by Albert Fert [1] and Peter Grunberg [2] in the 1980s. In magnetic sensing field, market demand has led to a wide range of applications, such as e-compass [3], nondestructive testing [4,5], biosensing [6]. Especially with the advent of the Internet of Things era, GMR sensors have provoked much attention due to its high sensitivity, low power consumption and small size.…”

Section: Introductionmentioning

confidence: 99%

Tuning the pinning direction of giant magnetoresistive sensor by post annealing process

Cao

Wei

Chen

et al. 2021

Sci. China Inf. Sci.

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The Internet of Things has created an increasing demand for Giant magnetoresistive (GMR) sensor due to its high sensitivity, low power-consumption and small size. A full Wheatstone bridge GMR sensor is fabricated on 6-inch wafers with annealing process on patterned devices. It can be observed that GMR resistors could have different pinning directions in one wafer by magnetic resistance measurements and MATLAB simulations. The full Wheatstone bridge device shows a sensitivity of 2 mV /V /mT in a linear range of ± 6 mT , and its angular response to surrounding magnetic field is as low as 0.08 mT . These results demonstrate a new approach to high-sensitive and low-cost GMR sensors with controllable post annealing process.

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Eddy Current Testing Probe Based on Double-Coil Excitation and GMR Sensor

Cited by 47 publications

References 19 publications

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

Rotating Focused Field Eddy-Current Sensing for Arbitrary Orientation Defects Detection in Carbon Steel

A Compact High-Resolution Resonance-Based Capacitive Sensor for Defects Detection on PCBAs

Tuning the pinning direction of giant magnetoresistive sensor by post annealing process

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