Conductive microbead detection by Helmholtz coil technique with SV-GMR sensor

Somsak, Teerasak; Chomsuwan, Komkrit; Yamada, S.; Iwahara, M.; Mukhopadhyay, Subhas Chandra

doi:10.1109/delta.2006.25

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Because of that, the smartphone's magnetic sensor is effective and accurate for detecting and measuring the magnetic field owing to the electrical current [9,10]. Nevertheless, uniform magnetic fields are usually used for in industry and experiments, such as to measure the magnetization of permanent magnetic materials [11], to detect the conductive micro-beads on a nonconductive substrate [12], and to calibrate sensors [13]. Unfortunately, a single loop wire is not capable of producing a homogeneous magnetic field.…”

Section: P a P E Rmentioning

confidence: 99%

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Taspika¹,

Nuraeni²,

Suhendra³

et al. 2018

Phys. Educ.

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This paper reports on the measurement of a magnetic field due to the coil carrying current by using the magnetic sensor in a smartphone as an alternate to the relatively expensive magnetic sensor probe. The location of the magnetic sensor in the smartphone was known by mapping the value of the magnetic field due to the permanent magnetic bar so that we could obtain an accurate measurement. The variable parameter examined in this magnetostatics experiment was the distance of coils to the magnetic sensor in a smartphone and the magnitude of the current in the coils. The coils used in this research have 8 cm radii and 30 turns of wire, with a 0.3 A current flowing, and the coils were arranged to make a Helmholtz and anti-Helmholtz configuration. The resulting magnetic fields by a coil, Helmholtz coil and anti-Helmholtz coil were measured and compared with the value from calculations using an analytical and numerical approach. According to these results, it can be confirmed that the magnetic field due to a Helmholtz and anti-Helmholtz coil can be measured accurately using the smartphone's magnetic sensor in a physics experiment.

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Section: P a P E Rmentioning

confidence: 99%

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Taspika¹,

Nuraeni²,

Suhendra³

et al. 2018

Phys. Educ.

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Magnetic field uniformity of the practical tri-axial Helmholtz coils systems

Beiranvand

2014

Review of Scientific Instruments

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In this paper, effects of the assembly misalignments and the manufacturing mismatches on the magnetic field uniformity of a practical tri-axial Helmholtz coils system have been modeled mathematically. These undesired effects regularly occur in any practical tri-axial Helmholtz coils system. To confirm the mathematical calculations, a tri-axial Helmholtz coils system has been constructed and the uniformity of its magnetic field has been measured under different conditions. The experimental results are in good agreement with the mathematical analyses.

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Characterization of a Needle-Type Giant Magnetoresistance Sensor for Detection of Escherichia Coli’S Magnetic Marker

Shirzadfar

Nadi

Kourtiche

et al. 2015

International Journal on Smart Sensing and Intelligent Systems

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Abstract-In the recent years, the introduction and development of simple and portable sensors has been the focus of researchers in nearly all scientific domains, particularly in the biomedical settings.Giant magnetoresistance (GMR) provides a cutting-edge sensor technology. The GMR-based sensors are capable to affordably and sensitively detect and quantify micro-and nano-magnetic particles, even in very weak magnetic fields.In this paper, we introduce a highly sensitive needle-type GMR-based sensor, designed for the identification and quantification of Escherichia coli O157:H7 bacteria covered by superparamagnetic beads, Dynabeads® MAX E.coli O157. The sensor characteristics, measurement system setup and the properties of the magnetic marker solution are discussed in detail.Index terms: Giant magnetoresistance (GMR) sensor, Escherichia coli O157:H7, magnetic marker, sensor sensitivity, magnetic fluid weight density, magnetic field.

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Conductive microbead detection by Helmholtz coil technique with SV-GMR sensor

Cited by 3 publications

References 2 publications

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Using a smartphone’s magnetic sensor in a low-cost experiment to study the magnetic field due to Helmholtz and anti-Helmholtz coil

Magnetic field uniformity of the practical tri-axial Helmholtz coils systems

Characterization of a Needle-Type Giant Magnetoresistance Sensor for Detection of Escherichia Coli’S Magnetic Marker

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