Abstract
In this paper, we provide a novel micro rectangular-shaped long-period fiber grating (MRSLPFG) coated with Fe3O4 nanoparticles as the sensing material and packaged in polydimethylsiloxane (PDMS) for magnetic sensing application. The micro rectangular-shaped grating structures are fully dip coated with the magnetic fluid and heated to form a thin solid film. This thin overlay is used as the sensing media to measure the external magnetic flux density parallel to the optical fiber axis. According to our experimental results, the phenomenon of the transmission loss of the MRSLPFG magnetic sensor was increased monotonically when the external applied magnetic flux density increased. As the external applied magnetic flux density was increased from 0 to 91.10 mT, the resonance attenuation dip of the MRSLPFG increased and the average sensitivity achieved during the experiments was 0.129 dB/mT. We infer that the aforementioned experimental results were due to the magnetostrictive effect exerted on the thin layer of Fe3O4 nanoparticles, which in turn induced slight longitudinal strains on the micro rectangular-shaped fiber grating structures under different magnetic flux density.
Highlights
In the last several decades, optical fiber gratings have provoked great interest among scientific researchers working on the development of communication technologies and sensing applications
MagneMtoa-gOnpettiiccSaelnMsorodulation of the Micro Rectangular-Shaped Long-Period Fiber Grating (MRSLPFG) Magnetic SensoTrhe MRSLPFG magnetic sensor is a loss tunable sensor based on periodic refractive index modulation caused by the external axial load
We introduce a novel MRSLPFG magnetic sensor for the detection of magnetic field that consists of using Fe3O4 nanoparticle thin overlay as a sensing material coated on the periodic micro rectangular-shaped grating structures
Summary
In the last several decades, optical fiber gratings have provoked great interest among scientific researchers working on the development of communication technologies and sensing applications. Long-period fiber grating (LPFG) consists of periodic refractive index modulations with periods ranging from 100 to 1000 μm [1,2]. This structure promotes light coupling between the core mode and cladding modes to provide an attenuation band in the transmission spectrum [3]. LPFG has many special features: it is light weight, small in size, immune to electromagnetic interference, and highly sensitive. It has been commonly applied in the monitoring and measurement of many physical quantities such as magnetic field strength [4,5,6], strain [7], pressure [8], temperature [9], humidity [10], pH [11], and variations in refractive index [12,13]
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