NDLI: Design, implementation and experimental characterisation of a high sensitivity GMI gradiometer with an interference compensation system

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Design, implementation and experimental characterisation of a high sensitivity GMI gradiometer with an interference compensation system

Content Provider	IET Digital Library
Author	Riveros, Pedro A. D. Silva, Eduardo C. Pacheco, Salvador Cabrera, Lizeth S. B. Barbosa, Carlos R. H.
Abstract	The giant magneto-impedance (GMI) effect has been, since its discovery, one of the most promising technologies in the development of magnetic sensors. Features such as high sensitivity, stability and low cost are the main reasons for the development of this type of magnetometers. This study reports the design, implementation and experimental characterisation of a high sensitivity GMI gradiometer, aimed at measuring low-intensity magnetic fields. A first-order gradiometer was designed, based on the impedance phase characteristics of two Co70Fe5Si15B10 amorphous ribbon-shaped sensors connected to an electronic circuit that converts the magnetic field into an output voltage. The developed prototype can operate not only as gradiometer but also as two separate magnetometers, which allows it to incorporate a compensation system against deviations in the biasing field of the GMI sensors. The experimental results for the gradiometer showed a sensitivity of 99 mV/μT, a measuring range of ±30 μT, a magnetic noise of 5 nT Hz−1/2 at 5 Hz and a resolution of 40 nT within a 500 Hz bandwidth. The compensation system has shown a settling time of 1.6 s for perturbations in the range ±10 μT with a steady-state error <0.02%. All experiments were performed in an unshielded environment.
Starting Page	688
Ending Page	694
Page Count	7
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 6, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2019.0374
Journal	IET Science, Measurement & Technology
Publisher Date	2020-03-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amorphous Ribbon-shaped Sensor Bandwidth 500.0 Hz Co70Fe5Si15B10 Cobalt Compounds Compensation Electronic Circuit First-order Gradiometer Frequency 5.0 Hz Giant Magnetoimpedance Effect Giant Magnetoresistance GMI Sonsor High Sensitivity GMI Gradiometer Impedance Phase Characteristic Interference Interference Compensation System Iron Compound Low-intensity Magnetic Field Measurement Low-intensity Magnetic Field Sonsor Magnetic Field Measurement Magnetic Flux Density 40 NT Magnetic Noise Magnetic Sonsor Magnetic Variables Measurement Magneto-acoustic Wave Device Magnetometers Magnetoresistive Device Magnetoresistive Wave Device Magnetostrictive And Magnetostatic Wave Device Microwave Measurement Technique Radiofrequency Measurement Sensing Device And Transducers Time 1.6 S
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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