Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire

Dongfeng He

doi:doi:10.11648/j.jeee.20210902.11

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Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire

Dongfeng He

Published in Journal of Electrical and Electronic Engineering (Volume 9, Issue 2)

Received: 29 March 2021 Accepted: 13 April 2021 Published: 23 April 2021

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Abstract

Pico-Tesla level high sensitivity magnetic sensor has been developed using FeCoSiB amorphous wire as the core of a coil, but the low frequency noise of the magnetic sensor is somewhat high, and some applications of magnetic sensors, such as magnetic microscope or deep defect detection, require that the sensors have low noise at low frequency. To reduce the noise, it is necessary to know the noise sources of the magnetic sensor. By measuring the noise spectrum of each part of the magnetic sensor with FeCoSiB amorphous wire was measured, it was found that the white noise of the magnetic sensor was mainly determined by the noise of the preamplifier and the low frequency noise was mainly determined by the low frequency noises of the DC bias current and AC bias current of the FeCoSiB magnetic sensor. To reduce the low frequency noise of the magnetic sensor caused by the bias current noise, an electrical gradiometer composed of two magnetic sensors sharing the same DC bias current and AC bias current was developed. The results proved that the gradiometer was not only effective to reduce the low frequency noise caused the bias current, but also effective to reduce the environmental noise caused by the 50 Hz line interference. Using the gradiometer, an eddy current testing (ECT) system were constructed, and the deep defect with the depth of about 8 mm in an aluminum plate was successfully detected by the ECT system.

Published in	Journal of Electrical and Electronic Engineering (Volume 9, Issue 2)
DOI	10.11648/j.jeee.20210902.11
Page(s)	33-40
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Magnetic Sensor, FeCoSiB, Amorphous Wire, Noise, Gradiometer, Eddy Current Testing

References

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APA Style

Dongfeng He. (2021). Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. Journal of Electrical and Electronic Engineering, 9(2), 33-40. https://doi.org/10.11648/j.jeee.20210902.11

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ACS Style

Dongfeng He. Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. J. Electr. Electron. Eng. 2021, 9(2), 33-40. doi: 10.11648/j.jeee.20210902.11

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AMA Style

Dongfeng He. Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. J Electr Electron Eng. 2021;9(2):33-40. doi: 10.11648/j.jeee.20210902.11

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@article{10.11648/j.jeee.20210902.11,
  author = {Dongfeng He},
  title = {Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {9},
  number = {2},
  pages = {33-40},
  doi = {10.11648/j.jeee.20210902.11},
  url = {https://doi.org/10.11648/j.jeee.20210902.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20210902.11},
  abstract = {Pico-Tesla level high sensitivity magnetic sensor has been developed using FeCoSiB amorphous wire as the core of a coil, but the low frequency noise of the magnetic sensor is somewhat high, and some applications of magnetic sensors, such as magnetic microscope or deep defect detection, require that the sensors have low noise at low frequency. To reduce the noise, it is necessary to know the noise sources of the magnetic sensor. By measuring the noise spectrum of each part of the magnetic sensor with FeCoSiB amorphous wire was measured, it was found that the white noise of the magnetic sensor was mainly determined by the noise of the preamplifier and the low frequency noise was mainly determined by the low frequency noises of the DC bias current and AC bias current of the FeCoSiB magnetic sensor. To reduce the low frequency noise of the magnetic sensor caused by the bias current noise, an electrical gradiometer composed of two magnetic sensors sharing the same DC bias current and AC bias current was developed. The results proved that the gradiometer was not only effective to reduce the low frequency noise caused the bias current, but also effective to reduce the environmental noise caused by the 50 Hz line interference. Using the gradiometer, an eddy current testing (ECT) system were constructed, and the deep defect with the depth of about 8 mm in an aluminum plate was successfully detected by the ECT system.},
 year = {2021}
}

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TY  - JOUR
T1  - Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire
AU  - Dongfeng He
Y1  - 2021/04/23
PY  - 2021
N1  - https://doi.org/10.11648/j.jeee.20210902.11
DO  - 10.11648/j.jeee.20210902.11
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 33
EP  - 40
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20210902.11
AB  - Pico-Tesla level high sensitivity magnetic sensor has been developed using FeCoSiB amorphous wire as the core of a coil, but the low frequency noise of the magnetic sensor is somewhat high, and some applications of magnetic sensors, such as magnetic microscope or deep defect detection, require that the sensors have low noise at low frequency. To reduce the noise, it is necessary to know the noise sources of the magnetic sensor. By measuring the noise spectrum of each part of the magnetic sensor with FeCoSiB amorphous wire was measured, it was found that the white noise of the magnetic sensor was mainly determined by the noise of the preamplifier and the low frequency noise was mainly determined by the low frequency noises of the DC bias current and AC bias current of the FeCoSiB magnetic sensor. To reduce the low frequency noise of the magnetic sensor caused by the bias current noise, an electrical gradiometer composed of two magnetic sensors sharing the same DC bias current and AC bias current was developed. The results proved that the gradiometer was not only effective to reduce the low frequency noise caused the bias current, but also effective to reduce the environmental noise caused by the 50 Hz line interference. Using the gradiometer, an eddy current testing (ECT) system were constructed, and the deep defect with the depth of about 8 mm in an aluminum plate was successfully detected by the ECT system.
VL  - 9
IS  - 2
ER  -

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Author Information

Dongfeng He

National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, Japan

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Plain Text BibTeX RIS

APA Style

Dongfeng He. (2021). Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. Journal of Electrical and Electronic Engineering, 9(2), 33-40. https://doi.org/10.11648/j.jeee.20210902.11

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ACS Style

Dongfeng He. Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. J. Electr. Electron. Eng. 2021, 9(2), 33-40. doi: 10.11648/j.jeee.20210902.11

Copy | Download

AMA Style

Dongfeng He. Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire. J Electr Electron Eng. 2021;9(2):33-40. doi: 10.11648/j.jeee.20210902.11

Copy | Download

@article{10.11648/j.jeee.20210902.11,
  author = {Dongfeng He},
  title = {Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {9},
  number = {2},
  pages = {33-40},
  doi = {10.11648/j.jeee.20210902.11},
  url = {https://doi.org/10.11648/j.jeee.20210902.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20210902.11},
  abstract = {Pico-Tesla level high sensitivity magnetic sensor has been developed using FeCoSiB amorphous wire as the core of a coil, but the low frequency noise of the magnetic sensor is somewhat high, and some applications of magnetic sensors, such as magnetic microscope or deep defect detection, require that the sensors have low noise at low frequency. To reduce the noise, it is necessary to know the noise sources of the magnetic sensor. By measuring the noise spectrum of each part of the magnetic sensor with FeCoSiB amorphous wire was measured, it was found that the white noise of the magnetic sensor was mainly determined by the noise of the preamplifier and the low frequency noise was mainly determined by the low frequency noises of the DC bias current and AC bias current of the FeCoSiB magnetic sensor. To reduce the low frequency noise of the magnetic sensor caused by the bias current noise, an electrical gradiometer composed of two magnetic sensors sharing the same DC bias current and AC bias current was developed. The results proved that the gradiometer was not only effective to reduce the low frequency noise caused the bias current, but also effective to reduce the environmental noise caused by the 50 Hz line interference. Using the gradiometer, an eddy current testing (ECT) system were constructed, and the deep defect with the depth of about 8 mm in an aluminum plate was successfully detected by the ECT system.},
 year = {2021}
}

Copy | Download

TY  - JOUR
T1  - Developing Gradiometer to Reduce the Low Frequency Noise of Magnetic Sensor with Amorphous Wire
AU  - Dongfeng He
Y1  - 2021/04/23
PY  - 2021
N1  - https://doi.org/10.11648/j.jeee.20210902.11
DO  - 10.11648/j.jeee.20210902.11
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 33
EP  - 40
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20210902.11
AB  - Pico-Tesla level high sensitivity magnetic sensor has been developed using FeCoSiB amorphous wire as the core of a coil, but the low frequency noise of the magnetic sensor is somewhat high, and some applications of magnetic sensors, such as magnetic microscope or deep defect detection, require that the sensors have low noise at low frequency. To reduce the noise, it is necessary to know the noise sources of the magnetic sensor. By measuring the noise spectrum of each part of the magnetic sensor with FeCoSiB amorphous wire was measured, it was found that the white noise of the magnetic sensor was mainly determined by the noise of the preamplifier and the low frequency noise was mainly determined by the low frequency noises of the DC bias current and AC bias current of the FeCoSiB magnetic sensor. To reduce the low frequency noise of the magnetic sensor caused by the bias current noise, an electrical gradiometer composed of two magnetic sensors sharing the same DC bias current and AC bias current was developed. The results proved that the gradiometer was not only effective to reduce the low frequency noise caused the bias current, but also effective to reduce the environmental noise caused by the 50 Hz line interference. Using the gradiometer, an eddy current testing (ECT) system were constructed, and the deep defect with the depth of about 8 mm in an aluminum plate was successfully detected by the ECT system.
VL  - 9
IS  - 2
ER  -

Copy | Download