Abstract
A temperature-independent fibre-optic magnetic-field sensor is proposed and demonstrated experimentally. The device consists of a thin-core fibre (TCF) sandwiched in the upstream of a fibre Bragg grating (FBG). Because of the core-mismatch between the TCF and the single-mode fibre (SMF), the core mode is coupled to the cladding modes within the TCF cladding, and parts of them are recoupled back to the leading-in SMF by the downstream FBG. The cladding modes are sensitive to the ambient refractive index (RI), and therefore have the ability to respond to a RI change in the magnetic fluid determined by the ambient magnetic field. The intensities of the cladding-mode resonances are highly sensitive to the magnetic field change, while, in contrast, the resonance wavelengths always remain unchanged. This property can allow the sensor to act as a power-referenced reflection probe for magnetic field measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 169-172 |
| Number of pages | 4 |
| Journal | Optics Communications |
| Volume | 393 |
| DOIs | |
| State | Published - 15 Jun 2017 |
| Externally published | Yes |
Keywords
- Magnetic field sensing
- Magnetic fluid
- Optical fibre sensor
- Refractive index sensing
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