Eddy-Current Testing Probe With Spin-Valve Type GMR Sensor for Printed Circuit Board Inspection

Yamada, S.; Chomsuwan, Komkrit; Fukuda, Y.; Iwahara, M.; Wakiwaka, Hiroyuki; Shoji, S.

doi:10.1109/tmag.2004.829254

Cited by 42 publications

(17 citation statements)

References 4 publications

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“…A number of integrated detectors containing GMR elements with wide bandwidth have been developed for motor drives, power electronic modules, and regulator modules [9–13]. A GMR sensor for highly-sensitive stress measurement has been introduced [14]; additionally, an eddy current testing probe based on the spin-valve GMR effect has been developed for inspecting printed circuit boards [15]. In the field of biological sensing, GMR sensors have been applied in crop production for sensing growth conditions, fertilization, and irrigation; GMR sensors are also useful for plant protection, harvesting, and fleet controls [16].…”

Section: Introductionmentioning

confidence: 99%

A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications

Ouyang

et al. 2012

Sensors

135

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Advanced sensing and measurement techniques are key technologies to realize a smart grid. The giant magnetoresistance (GMR) effect has revolutionized the fields of data storage and magnetic measurement. In this work, a design of a GMR current sensor based on a commercial analog GMR chip for applications in a smart grid is presented and discussed. Static, dynamic and thermal properties of the sensor were characterized. The characterizations showed that in the operation range from 0 to ±5 A, the sensor had a sensitivity of 28 mV·A−1, linearity of 99.97%, maximum deviation of 2.717%, frequency response of −1.5 dB at 10 kHz current measurement, and maximum change of the amplitude response of 0.0335%·°C−1 with thermal compensation. In the distributed real-time measurement and monitoring of a smart grid system, the GMR current sensor shows excellent performance and is cost effective, making it suitable for applications such as steady-state and transient-state monitoring. With the advantages of having a high sensitivity, high linearity, small volume, low cost, and simple structure, the GMR current sensor is promising for the measurement and monitoring of smart grids.

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Section: Introductionmentioning

confidence: 99%

A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications

Ouyang

et al. 2012

Sensors

135

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“…In recent years, a new application of ECT with spin-valve giant magnetoresistance (SV-GMR) have been applied to detect conductive microbead and flaws on printed circuit board [3], [4]. This paper presents the Helmholtz coil as an exciter and SV-GMR as a sensor for detection of both single and array conductive microbead (PbSn).…”

Section: Introductionmentioning

confidence: 99%

Conductive Microbead Array Detection Based on Eddy-Current Testing Using SV-GMR Sensor and Helmholtz Coil Exciter

et al. 2006

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This paper describes the detection of both single and array conductive microbead (PbSn) by using a spin-valve giant magnetoresistance (SV-GMR) as a sensor and the Helmholtz coil as an exciter based on eddy-current testing (ECT). Experiments were performed to detect a single and array conductive microbead, with three models. Each model consists of 4 4 microbeads but the microbead diameter and pitch were slightly different for each array. The microbead radius was 125 m and the pitch was 500 m. The ECT method was used to estimate the position of the centers of the microbeads and the error in the measurement was plotted on a plane. A good level of position resolution has been achieved and the signals were quite clear.

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“…A N EDDY-CURRENT testing (ECT) probe, which consisted of a planar meander coil serving as an exciting coil and a spin-valve giant magnetoresistance (SV-GMR) device serving as a magnetic sensor, has been successfully applied to single-layer printed circuit board (PCB) inspection [1], [2]. The advantages of an SV-GMR sensor, such as high spatial resolution and high sensitivity to low magnetic field, are useful for inspection of a defect on a PCB conductor, as denoted in [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

“…The advantages of an SV-GMR sensor, such as high spatial resolution and high sensitivity to low magnetic field, are useful for inspection of a defect on a PCB conductor, as denoted in [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Application of eddy-current testing technique for high-density double-Layer printed circuit board inspection

et al. 2005

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High-density double-layer printed circuit board (PCB) inspection based on the eddy-current testing (ECT) technique is proposed in this paper. The ECT probe, which consisted of a planar meander exciting coil and spin-valve giant magnetoresistance (SV-GMR) sensor array, is used for this propose. Defects on both the top-and bottom-layer of the high-density double-layer PCB are examined by the ECT technique with scanning over either the top or bottom layer. The characteristics of the proposed ECT probe for high-density double-layer PCB inspection are studied. The inspection results of the high-density double-layer PCB model verify that applying the ECT technique enables identification of the defects of both the top and bottom layer with one-side scanning.Index Terms-Eddy-current testing (ECT), inspection, printed circuit board (PCB), spin-valve giant magnetoresistance (SV-GMR).

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Eddy-Current Testing Probe With Spin-Valve Type GMR Sensor for Printed Circuit Board Inspection

Cited by 42 publications

References 4 publications

A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications

A Current Sensor Based on the Giant Magnetoresistance Effect: Design and Potential Smart Grid Applications

Conductive Microbead Array Detection Based on Eddy-Current Testing Using SV-GMR Sensor and Helmholtz Coil Exciter

Application of eddy-current testing technique for high-density double-Layer printed circuit board inspection

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