Author(s)

Xueyi Jin, Lin Huang, Dongshi Wang, Haili Yang, Minyuan Xian and Dexing Yang

Corresponding Author

Dexing Yang

ABSTRACT

A simple and cost-effective optical fiber sensor for magnetic field measurement is represented and demonstrated. The sensor consists of a fiber Bragg grating (FBG) and a peanut-shaped structure cascaded upstream, with ferro fluid coated. The cladding mode can be exited and recoupled to fiber core in the proposed scheme, which benefit the detection of change of refraction index (RI) of ferro fluid induced by the magnetic field exerted. Experiment result shows that the integral intensity of cladding mode in the spectra decreases following with the magnetic field strength increase but increasing with temperature. Moreover, FBG resonance is temperature sensitive, making it possible to detect temperature simultaneously, which can be used to compensate the impact of temperature on magnetic field sensing.

KEYWORDS

Optical fiber magnetic field sensor; peanut-shaped structure; FBG; ferro fluid; cladding mode