Impedance Change of Layered Magnetic Ribbons on an External Field.

Iida, Satoko; Makita, Ken; Kambe, Shiro; Ishii, Osamu

doi:10.3379/jmsjmag.24.871

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…comes from the increase in the external inductance caused mainly by the existence of neighboring magnetic ribbons on one side of the th ribbon, and is proportional to the effective permeability, , of each neighboring ribbon. is calculated by using the magnetic circuit model [10], [11] as follows:…”

Section: Resultsmentioning

confidence: 99%

Enhancement in the magneto-impedance (MI) effect of multi-ribbon

et al. 2000

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This article describes the use of a magnetic ribbon to create a highly sensitive magnetic sensor. The sensor employs the impedance change in a magnetic ribbon when a radio frequency (RF) current is passed through it and an external magnetic field is applied. To achieve a highly sensitive magnetic sensor, we had to increase the impedance change. We examined stacked magnetic ribbons, each isolated with thin plastic sheets, and interpreted the results by calculating the impedances and relative current in each ribbon. The impedance change was enhanced by stacking the ribbons. However, the effective permeability, which greatly affects the sensitivity, decreased as the number of ribbons increased. Consequently, the double-layered structure provided the maximum sensitivity, which was about three times higher than that of a singlelayered structure.

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Section: Resultsmentioning

confidence: 99%

Enhancement in the magneto-impedance (MI) effect of multi-ribbon

et al. 2000

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The magneto-impedance (MI) effect of coupled magnetic ribbons in a non-uniform magnetic field

Iida

Suzuki²,

Kambe³

et al. 2001

International Journal of Applied Electromagnetics and Mechanics

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We investigated the application of a magnetic ribbon to a highly sensitive magnetic sensor. The sensor employs the impedance change in a coupled magnetic ribbon when a radio frequency (rf) current is passed through it and an external magnetic field is applied. When the non-uniform external field was applied the coupled ribbon structure was conformed to have high sensitivity, which was about ten times higher than that in the uniform external field. This phenomenon was attributed to the magnetostatic coupling between coupled magnetic ribbons.

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Mri検査用金属探知機等の実臨床における検出能の評価

Okawa,

Hayashi,

Kato

et al. 2023

Nippon Hoshasen Gijutsu Gakkai Zasshi

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Purpose: In order to prevent magnetic materials from being brought into the magnetic resonance imaging (MRI) examination room, many facilities have metal detectors, etc., but there are various types of equipment with different performance and characteristics. The purpose of this study was to evaluate each detector in actual clinical practice. Methods: At multiple facilities, gate-type magnetic detectors, pole-type magnetic detectors, handy-type magnetic detectors, and handy-type metal detectors were used to identify 9 types of objects that may be brought into the MRI examination room. We performed evaluation of detection distance measurement assuming actual operation. Results: The gate type was only able to detect objects with strong magnetism. With the pole type, the closer the measurement distance was to the pole, the more objects could be detected, and the lower the pole, the shorter the detection distance. With the handy type, there were many objects that could be detected when the device and the object were brought into close contact. Conclusion: The detectability of the instruments varied depending on the size and type of the object. It is important to understand the characteristics of each device and use it according to the purpose in carrying-in confirmation before the examination.

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Impedance Change of Layered Magnetic Ribbons on an External Field.

Cited by 3 publications

References 5 publications

Enhancement in the magneto-impedance (MI) effect of multi-ribbon

Enhancement in the magneto-impedance (MI) effect of multi-ribbon

The magneto-impedance (MI) effect of coupled magnetic ribbons in a non-uniform magnetic field

Mri検査用金属探知機等の実臨床における検出能の評価

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