A polarimetric current sensor using an orthogonally polarized dual-frequency fibre laser
We demonstrate a novel Er3+-doped fibre laser operating in orthogonally
polarized dual-frequency modes and its application to electric current sensing with
frequency read-out. A Faraday rotating mirror and spatial hole burning effects in a
gain medium and in a saturable absorber are utilized to control the lasing mode and
polarization. The polarization mode beat frequency changes linearly in response to
the non-reciprocal circular birefringence induced by an external magnetic field.
When the laser was applied to sensing an alternating electric current with a simple
phase-locked loop signal processing scheme, the slope coefficient of 8.0 kHz A−1
p−p
per turn and the noise equivalent current of 460 Arms Hz−1=2 per turn were
obtained. The new current sensor is immune to perturbations in the lead fibres.
- Publisher
- Institute of Physics
- Issue Date
- 1998
- Keywords
current sensor; laser sensor; polarimetric; fibre laser; Faraday rotation
- Citation
Measurement Science and Technology, Vol.9, pp.952-959
- ISSN
- 0957-0233
- Appears in Collection
- PH-Journal Papers(저널논문)
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