研究目的
Investigating the use of etched multi-mode fibre as a magnetic field sensor based on the tunable refractive index property of magnetic fluid.
研究成果
The study demonstrates a highly sensitive optical fibre magnetic field sensor based on etched multimode fibre and magnetic fluid. The sensor shows high sensitivity to magnetic field and refractive index changes, with potential applications in magnetic field sensing. The sensitivity can be enhanced by reducing the fibre diameter in the sensing region.
研究不足
The sensor's performance is affected by temperature variations and the viscosity of the magnetic fluid, which can lead to delays in response time. The agglomeration and demagnetisation of magnetic nanoparticles also introduce hysteresis in the sensor's response.
1：Experimental Design and Method Selection:
The study involves the fabrication of an optical fibre magnetic field sensor using chemical etched multimode fibre sandwiched between two single mode fibres. The sensing mechanism is based on the tunable refractive index property of magnetic fluid.
2：Sample Selection and Data Sources:
The sensor is tested with different concentrations of sodium chloride (NaCl) solution to verify its refractive index sensing capability before being used for magnetic field sensing.
3：List of Experimental Equipment and Materials:
Concentrated HF for chemical etching, ethanol for cleaning, magnetic fluid (Fe3O4 nanoparticles in deionised water), capillary tube, fusion splicer, laser source at 1550 nm, optical spectrum analyser (OSA), magnetic generator, gauss meter.
4：Experimental Procedures and Operational Workflow:
The MMF is chemically etched to reduce its diameter, cleaned with ethanol, and then sandwiched between SMFs using a fusion splicer. The sensing structure is then encapsulated with magnetic fluid in a capillary tube. The magnetic field response is investigated by applying variable magnetic field strengths and measuring the output light intensity.
5：Data Analysis Methods:
The output intensity changes with applied magnetic field are measured using OSA. The sensitivity is calculated based on the attenuation of the evanescent field by the magnetic fluid.
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