Amorphous wire MI micro magnetic sensor for gradient field detection

Bushida, K.; Mohri, K.; Kanno, T.; Katoh, Daisuke; Kobayashi, Akito

doi:10.1109/20.539296

Cited by 33 publications

(13 citation statements)

References 10 publications

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“…MI elements are arranged in series. An MI element shows the magneto-impedance effect [3], [4]. Two direct current bias coils are biased with a direct current field in the same direction for detection of a gradient field [5].…”

Section: Gradio-mi Sensor and Measurement Systemmentioning

confidence: 99%

Evaluation of a reverse-side defect on stainless steel plates by the residual magnetic field method

Oka

Enokizono

2000

IEEE Trans. Magn.

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Defects on a reverse-side of a metallic plate such as a thick stainless steel plate caused by a fatigue or a stress are a very serious problem. We have measured residual magnetic field in order to estimate a reverse-side machined model defect existing on a 5 mm thick austenitic stainless steel plate. A differential type magneto-impedance effect sensor (the gradio-MI sensor) is applied to measure it. Because the gradio-MI sensor is suitable for detection of localized micro magnetic field. From results of experiments, a distribution of the residual differential magnetic field is clearly changed near a reverse-side machined model defect on an austenitic stainless steel plate. In this paper, we describe the residual differential magnetic field over a 5 mm thick austenitic stainless steel plate, and show experimental results of a defect detection utilizing the distribution of residual differential magnetic field.Index Terms-Residual magnetic field, gradio-MI sensor, nondestructive testing, austenitic stainless steel plate.

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Section: Gradio-mi Sensor and Measurement Systemmentioning

confidence: 99%

Evaluation of a reverse-side defect on stainless steel plates by the residual magnetic field method

Oka

Enokizono

2000

IEEE Trans. Magn.

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“…The half width of the field distributions is less than 5 mm and that means accurate position detection is possible for the x axis direction in the case of nearly contact sensing. The tumor position would be detected without a magnetic shielding due to high reduction rate (about 99%) of the terrestrial field of the sensor [3]. A pen type sensor, which is movable by hand, would be used in the surgery to detect a position of the tumor.…”

Section: Position Sensing Of Magnetite Gelmentioning

confidence: 99%

“…The gradent type MI sensor is able to respond to all these demands due to its high reduction rate of uniform fields [3].…”

Section: Introduc~ionmentioning

confidence: 99%

Position sensing of magnetite gel using MI sensor for brain tumor detection

Uchiyama

Mohri²,

Shinkai³

et al. 1997

IEEE Trans. Magn.

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A brain tumor position sensing method using an MI (magneto impedance) micro magnetic sensor in combination with fine magnetic particles (FMP for short) is proposed. Sensing of magnetic field generated from FMP accumulated in the brain tumor tissue would be an effective way to accurately detect the tumor position in the surgical operation. The spatial distributions of stray fields in gel samples, in which FMP were dispersed, were measured using an MI gradient-field sensor. The position of samples having FMP concentration of more than O.lg/l was clearly detected due to the high sensitivity (2 x Oe for a dc field) of the sensor. The spatia1 distributions were analyzed by a model of aligned dipole moments. The calculation results using the model were in good agreement with experimental results. Position sensing of the tumor tissue of a rat was also carried out. It was concluded that the proposed method would be useful for not only position sensing of the brain tumor but also 3D imaging of the tumor shape.

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“…Magnetic sensors have been also widely used in many modern technological applications such as ultrahigh-density magnetic recording systems [6], automotive and automobile devices [7,8], navigation [9], traffic monitoring systems [10,11], industrial robots [12], medical electronics [13], and biomagnetic instrumentations [14,15]. Read heads in computers have magnetic sensors.…”

Section: Introductionmentioning

confidence: 99%

Advanced Magnetic Microwires as Sensing Elements for LC-Resonant-Type Magnetoimpedance Sensors: A Comprehensive Review

Phan

2011

J Supercond Nov Magn

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In recent years, all modern vehicles and transport means use a vast variety of sensors and transducers. The operation of all medical instruments is also based on sensors and transducers. Industry is also employing more and more transducers for the monitoring and control of production lines. Therefore, the sensing technology has been driven by the increasing needs for enhanced sensitivity, improved stability, high reliability, and lower costs. For this purpose, we have proposed and developed novel two LC resonant-type magnetoimpedance (LCMI) sensor devices utilizing soft magnetic microwires as a sensing element, giving an emphasis on the use of resonance effect from LCcomponents and the rapid permeability change of the magnetic microwires to significantly improve the sensitivity performance of sensors. This article aims to provide a comprehensive analysis of the design and operation of these devices. After a description of magnetic core materials, circuit designs and fabrication techniques is given, the details of all experimental measurements are presented. The characterizations of constructed LCMI sensor devices are systematically analyzed, and the physical origins of magneto-resonant phenomena, field, and frequency dependences in these LCMI sensor devices are addressed. Influences of processing parameters on the sensing characteristics of LCMI sensors are also discussed. This enables the optimal conditions to fabricate high-performance magnetic sensing devices.

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Amorphous wire MI micro magnetic sensor for gradient field detection

Cited by 33 publications

References 10 publications

Evaluation of a reverse-side defect on stainless steel plates by the residual magnetic field method

Evaluation of a reverse-side defect on stainless steel plates by the residual magnetic field method

Position sensing of magnetite gel using MI sensor for brain tumor detection

Advanced Magnetic Microwires as Sensing Elements for LC-Resonant-Type Magnetoimpedance Sensors: A Comprehensive Review

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