Opto-mechanical magnetometer based on laser speckle correlation

Vismay Trivedi; Swapnil Mahajan; Mugdha Joglekar; Nirav Joshi; Vani Chhaniwal; Satish Kumar Dubey; Zeev Zalevsky; Bahram Javidi; Arun Anand

doi:10.1016/j.measurement.2021.110490

Opto-mechanical magnetometer based on laser speckle correlation

Vismay Trivedi, Swapnil Mahajan, Mugdha Joglekar, Nirav Joshi, Vani Chhaniwal, Satish Kumar Dubey, Zeev Zalevsky, Bahram Javidi, Arun Anand

Bar-Ilan University - The Alexander Kofkin Faculty of Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Magnetic field sensing plays vital role in vast range of areas such as navigation, military, and biomedical sciences. In recent times, optical sensors have made great advances, resulting in the development of magnetic field sensors based on optical principles due to their non-susceptibility to electromagnetic interference. Here, a simple and inexpensive approach for sensing magnetic field, that converts the magnetic field into a mechanical translation (of the sensing element) and then change into optical signals is presented. These optical signals are speckle patterns generated using a laser beam reflected off an optically rough metal cantilever which is exposed to the magnetic field. Magnetic field is quantified by measuring the changes in the speckle pattern using the intensity correlation technique. The approach can measure the static and time varying magnetic fields. The proposed system has a resolution of 2.2 μT and can measure magnetic fields with less than a 2% error.

Original language	English
Article number	110490
Journal	Measurement: Journal of the International Measurement Confederation
Volume	189
DOIs	https://doi.org/10.1016/j.measurement.2021.110490
State	Published - 15 Feb 2022

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Funding

The work was supported by research grants from SERB ( EMR/20l7/002724 ), DAE-BRNS ( 2013/34/11/BRNS/504 ), India-Korea Joint Programme of Cooperation in Science & Technology ( INT/Korea/P-45 ), DST-FIST and DST-PURSE . The work was supported by research grants from SERB (EMR/20l7/002724), DAE-BRNS (2013/34/11/BRNS/504), India-Korea Joint Programme of Cooperation in Science & Technology (INT/Korea/P-45), DST-FIST and DST-PURSE. Authors Vani Chhaniwal and Arun Anand would like to acknowledge Abdus Salam International center for Theoretical Physics (ICTP), Trieste, Italy for Regular Associate fellowship.

Funders	Funder number
DAE-BRNS	2013/34/11/BRNS/504
DST-FIST
DST-PURSE
India-Korea Joint Programme of Cooperation in Science & Technology	INT/Korea/P-45
Abdus Salam International Centre for Theoretical Physics
Science and Engineering Research Board	EMR/20l7/002724

Keywords

Laser speckles
Magnetic field measurement
Speckle correlation
Speckle metrology

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10.1016/j.measurement.2021.110490

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title = "Opto-mechanical magnetometer based on laser speckle correlation",

abstract = "Magnetic field sensing plays vital role in vast range of areas such as navigation, military, and biomedical sciences. In recent times, optical sensors have made great advances, resulting in the development of magnetic field sensors based on optical principles due to their non-susceptibility to electromagnetic interference. Here, a simple and inexpensive approach for sensing magnetic field, that converts the magnetic field into a mechanical translation (of the sensing element) and then change into optical signals is presented. These optical signals are speckle patterns generated using a laser beam reflected off an optically rough metal cantilever which is exposed to the magnetic field. Magnetic field is quantified by measuring the changes in the speckle pattern using the intensity correlation technique. The approach can measure the static and time varying magnetic fields. The proposed system has a resolution of 2.2 μT and can measure magnetic fields with less than a 2% error.",

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AU - Mahajan, Swapnil

AU - Joglekar, Mugdha

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AU - Chhaniwal, Vani

AU - Dubey, Satish Kumar

AU - Zalevsky, Zeev

AU - Javidi, Bahram

AU - Anand, Arun

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AB - Magnetic field sensing plays vital role in vast range of areas such as navigation, military, and biomedical sciences. In recent times, optical sensors have made great advances, resulting in the development of magnetic field sensors based on optical principles due to their non-susceptibility to electromagnetic interference. Here, a simple and inexpensive approach for sensing magnetic field, that converts the magnetic field into a mechanical translation (of the sensing element) and then change into optical signals is presented. These optical signals are speckle patterns generated using a laser beam reflected off an optically rough metal cantilever which is exposed to the magnetic field. Magnetic field is quantified by measuring the changes in the speckle pattern using the intensity correlation technique. The approach can measure the static and time varying magnetic fields. The proposed system has a resolution of 2.2 μT and can measure magnetic fields with less than a 2% error.

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Opto-mechanical magnetometer based on laser speckle correlation

Abstract

Bibliographical note

Funding

Keywords

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