Magnetic field sensor based on magnetic fluid-infiltrated phase-shifted fiber Bragg grating
A novel magnetic field sensor based on a magnetic fluid (MF)-infiltrated phase-shifted fiber Bragg grating (PS-FBG) is proposed and experimentally demonstrated. The PS-FBG is formed by two FBG sections with a micrometer-level gap between them which is filled with microfluidic MF. External magnetic f...
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| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/140080 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A novel magnetic field sensor based on a magnetic fluid (MF)-infiltrated phase-shifted fiber Bragg grating (PS-FBG) is proposed and experimentally demonstrated. The PS-FBG is formed by two FBG sections with a micrometer-level gap between them which is filled with microfluidic MF. External magnetic field changes refractive index and transmittance of the MF, leading to a magnetic-field-sensitive phase shift and hence wavelength shift of the transmission peak. Optical measurement of magnetic field strength is therefore achieved with a sensitivity of 2.42 pm/Oe within a range up to 120 Oe by monitoring wavelength shift of transmission spectrum of the MF-infiltrated PS-FBG. The micrometer-level action length of MF in this proposed sensor not only greatly reduces the consumption of MF but also brings forth a good potential for point detection of magnetic field distribution. |
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