scholarly journals Vector field sensor using amorphous wire and C-MOS MI circuit

1998 ◽  
Vol 118 (6) ◽  
pp. 729-734
Author(s):  
Takaomi Yagi ◽  
Kaneo Mohri ◽  
Muneharu Nakabayashi
Keyword(s):  
Vector Field ◽  
Amorphous Wire ◽  
Field Sensor

The effects of microphone mismatch on the performance of a spherical acoustic vector‐field sensor

1997 ◽  
Vol 101 (5) ◽  
pp. 3035-3035
Author(s):  
John W. Parkins ◽  
Jiri Tichy ◽  
Scott D. Sommerfeldt
Keyword(s):  
Vector Field ◽  
Field Sensor

scholarly journals A Feedback Method to Improve the Dynamic Range and the Linearity of Magnetoimpedance Magnetic Sensor

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Dongfeng He
Keyword(s):  
Magnetic Field ◽  
Steel Plate ◽  
Dynamic Range ◽  
Magnetic Sensor ◽  
Magnetic Field Sensor ◽  
Amorphous Wire ◽  
Alloy Plate ◽  
Field Sensor ◽  
Feedback Method ◽  
The Magnetic Field

We developed a high-sensitivity magnetoimpedance magnetic field sensor using a FeCoSiB amorphous wire and a coil wound around it. The amorphous wire had the diameter of 0.1 mm and the length of 5 mm. The magnetic field resolution of about 20 pT/√Hz was achieved. But the dynamic range of the magnetoimpedance magnetic field sensor was only about ±0.7 Gauss, which was not enough for some applications, such as the defect evaluation of steel plate. The linearity of the system was also not good when big magnetic field was applied, which will cause some noise when the system is used in unshielded environment. We developed a feedback method to improve the dynamic range and the linearity of the magnetic field sensor. The operation point of the magnetic field sensor was fixed by sending a feedback current to the coil. Using the feedback method, the dynamic range was improved from ±0.7 Gauss to ±10 Gauss and the linearity was also improved over 100 times better. An eddy current testing system using the magnetic sensor was developed, and the crack defects in steel plate and in 3D-printed titanium alloy plate were evaluated.

scholarly journals Application Topics of Amorphous Wire CMOS IC Magneto-Impedance Micromagnetic Sensors for I-o-T Smart Society

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Kaneo Mohri ◽  
Michiharu Yamamoto ◽  
Tsuyoshi Uchiyama
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Sensors ◽  
Guidance System ◽  
Professional Baseball ◽  
Amorphous Wire ◽  
Successful Development ◽  
Magnetic Guidance ◽  
Field Sensor ◽  
Cmos Ic ◽  
Electronic Compass

We proposed ten requisite conditions for successful development of wearable I-o-T smart magnetic sensors considering recent development of some successful micromagnetic sensors. We reported application topics using the amorphous wire CMOS IC magnetoimpedance micromagnetic sensor (MI sensor) on the geomagnetic field sensor for the electronic compass installed in the smartphones, the pitching ball self-spin analyzer installed in the professional baseball, self-driving magnetic guidance system, and the biomagnetic field sensing. Performances of the MI sensor overcoming the ten requisite conditions are discussed as a smart micromagnetic sensor on the basis of the magnetoimpedance effect in the amorphous wire.

Properties of Giant Magneto-Impedance Material for A Novel Integrating Magnetic Sensor

1999 ◽  
Vol 577 ◽  
Author(s):  
J.G. Gore ◽  
G.J. Tomka ◽  
J. Milne ◽  
M.G. Maylin ◽  
P.T. Squire ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Bias Field ◽  
Open Loop ◽  
Amorphous Wire ◽  
External Fields ◽  
Field Sensor ◽  
Giant Magneto Impedance ◽  
The Wire ◽  
Better Than

ABSTRACTA novel magnetic field sensor, based on the giant magneto-impedance effect is described and analysed. The sensor utilises an amorphous wire, annealed under optimised conditions. The conditions required for the optimisation of the magnetic properties of the wire are shown. The wire can be up to 2m long, and integrates the field over the length of the wire. It operates in open-loop mode. With a bias field of ∼500 A/m it achieves a sensitivity of 0.02 A/m and linearity of better than 5% for external fields between ±300 A/m.

Load Matching for Giant Magnetoimpedance Sensor in Coaxial Configuration

2019 ◽  
Vol 826 ◽  
pp. 19-24
Author(s):  
Sergei V. Shcherbinin ◽  
Stanislav O. Volchkov ◽  
Anna A. Chlenova ◽  
Galina V. Kurlyandskaya
Keyword(s):  
Magnetic Field ◽  
High Sensitivity ◽  
Coaxial Cable ◽  
Amorphous Wire ◽  
Giant Magnetoimpedance ◽  
Maximum Slope ◽  
Load Matching ◽  
Field Displacement ◽  
Central Conductor ◽  
Field Sensor

Operation on the principle of the giant magnetoimpedace (GMI) magnetic field sensor was designed and tested for the case of CoFeSiB amorphous wire of 6 mm length. We considered magnetic field displacement of the order of 10 Oe. Piece of amorphous wire was placed as a central conductor of a coaxial cable. The maximum slope of the sensor GMI characteristic was observed at the terminator resistance RT = 50 Ohm, while the maximum of the GMI ratio variation was observed in the not “matched” (RT = 75 Ohm) but closer to the “short” mode. Amorphous wire placed as a central conductor of a coaxial cable serves as a sensitive element with high sensitivity with respect to applied field making possible to use a simple design with a miniature coil for magnetic field biasing.

Sign in / Sign up

Export Citation Format

Share Document