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

Somsak, Teerasak; Chomsuwan, Komkrit; Yamada, S.; Iwahara, M.

doi:10.1109/tmag.2006.879966

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…The numerical gradient technique is applied to ECT signals obtained from the detection of solder microbeads [47,48]. The results show that the numerical gradient is able to enhance the signal at the microbead as shown in Fig.…”

Section: Ball Grid Array Detectionmentioning

confidence: 99%

High-Spatial Resolution Giant Magnetoresistive Sensors - Part I: Application in Non-Destructive Evaluation

Chomsuwan

Somsak

Gooneratne

et al. 2013

Giant Magnetoresistance (GMR) Sensors

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Abstract. In this chapter, we report the utilization of spin-valve type giant magnetoresistance (GMR) sensors in non-destructive evaluation (NDE). The NDE application is the inspection of high-density printed circuit boards (PCBs) based on the eddy-current testing (ECT) technique. An ECT probe with a GMR sensor is presented for the inspection of high-density double-layer PCB models. The utilization of a GMR sensor as a magnetic sensor showed that PCB inspection could be performed with high-spatial resolution and sensitivity, over a large frequency range.

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Section: Ball Grid Array Detectionmentioning

confidence: 99%

High-Spatial Resolution Giant Magnetoresistive Sensors - Part I: Application in Non-Destructive Evaluation

Chomsuwan

Somsak

Gooneratne

et al. 2013

Giant Magnetoresistance (GMR) Sensors

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“…One of the most common applications of GMR is in magnetoelectronic devices such as magnetic field sensors [1], magnetoresistance random access memories, magnetoresistance transistors. GMR sensors have found applications in hard drives [2][3][4], position detection, nondestructive evaluations [5][6][7], and conductive microbead detection [8]. Applications in utilization of GMR chips whose surface is bound with biological tagged markers can be found in [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Micron size GMR magnetic sensor with needle structure

Yamada¹,

Haraszczuk²,

Kakikawa³

et al. 2012

AIP Conference Proceedings

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ABSTRACT. The work presents inimitable shaped needle type probe with spin valve giant magnetoresistance (SV-GMR) elements. Sensitive elements with 75 µm width are connected in the Wheatstone bridge structure. The length of the needle is 20-30 mm and its cross section is square. The magnetic sensor probe has the advantage of micron order spatial resolution. The needle type probe works as a gradient meter which concurrently suppresses the influence of externally applied field and detects magnetic fields emanating from nano or micro order size sources. Sensing elements present high sensitivity 260 µV / µT and are capable of detecting the magnetic fields in order of few nT. SV-GMR elements present flat amplitude and phase characteristics in wide frequency range. The novel characteristicsof the probe allow it to be utilized in detection of the in-phase and out of phase signal components. An additional merit of this design is extremely small liftoff height between sensing element and the source of magnetic field. The SV-GMR elements are isolated only by very thin protection layer (a few µm), that gives opportunity to apply the probe in biological (in vivo) experiments, and in non destructive evaluation of current detection. The needle shape allows the sensing element toapproach the examined materials in a distance of few ten µm.

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“…In recent year, the ECT has been successfully applied to detection of flaw on printed circuit board (PCB) 4) . In the previous work, we reported that the ECT probe had been applied to detect the conductive microbead of both single and array 5) .…”

Section: Introductionmentioning

confidence: 99%

Spin-valve GMR Sensor with Improved Ferrite core Exciter for Conductive Microbead Detection by Eddy-current Testing Technique

Somsak¹,

Chomsuwan

Yamada³

et al. 2007

J. Magn. Soc. Jpn.

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This paper describes the detection of conductive microbead by spin-valve giant magnetoresistance (SV-GMR) with ferrite core exciter base on eddy-current testing (ECT) technique. The single and row conductive microbead were detected by the proposed ECT probe. The six microbeads were 125, 150, 200, 250, 300 and 360 m radiuses. The three model of single row was slightly pitched in each row with range from 400 to 1000 m. The analytical methods were calculated that confirmed the experimental result. The comparison of reference and proposed ECT probe signal variation with signal to noise ratio were expressed. The experimental results show that the proposed ECT can clearly detect both single and row conductive microbead position.

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

Cited by 10 publications

References 2 publications

High-Spatial Resolution Giant Magnetoresistive Sensors - Part I: Application in Non-Destructive Evaluation

High-Spatial Resolution Giant Magnetoresistive Sensors - Part I: Application in Non-Destructive Evaluation

Micron size GMR magnetic sensor with needle structure

Spin-valve GMR Sensor with Improved Ferrite core Exciter for Conductive Microbead Detection by Eddy-current Testing Technique

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