Temperature-Insensitive Ferrofluid-Clad Microfiber Bragg Grating for Magnetic Field Sensing

In this paper, a temperature-insensitive ferrofluid (FF)-clad microfiber Bragg Grating (MF-BG) magnetic field sensor is proposed. Through optimizing the diameter of MF-BG, we can effectively suppress its thermal property. The experimental research results show that when the diameter of MF-BG is similar to 2.94 mu m, its reflection spectrum shift owing to ambient temperature change can be substantially small within the range of 20-80 degrees C. The thermal stable sensor has a magnetic field sensitivity of 0.667 pm/Gs with a linearity of more than 0.985 at 20 degrees C.

Automated summary

In this paper, a temperature-insensitive ferrofluid-clad microfiber Bragg Grating magnetic field sensor is proposed, which effectively suppresses thermal property through diameter optimization. The experimental results show that the reflection spectrum shift of the MF-BG is substantially small within the range of 20-80 degrees C when its diameter is around 2.94 μm. The thermal stable sensor exhibits a magnetic field sensitivity of 0.667 pm/Gs with a linearity of more than 0.985 at 20 degrees C.