研究目的
To demonstrate a novel magnetic field sensor based on fiber laser and Terfenol-D material that can measure static magnetic fields through sweep acoustic wave.
研究成果
The demonstrated fiber optic magnetic field sensor using a DFB fiber laser and Terfenol-D material shows good linearity with a sensitivity of about 0.39 Hz/mT and a magnetic resolution of 2.56 mT. It also exhibits orientation-dependence, making it promising for applications in underwater detection and ocean bottom observation.
研究不足
The sensor's performance may be affected by the hysteresis effect of Terfenol-D material and the errors of the rotating stage used in directivity tests.
1：Experimental Design and Method Selection:
The sensor design involves a DFB fiber laser bonded to a Terfenol-D tube, utilizing the magnetostrictive properties of Terfenol-D to measure magnetic fields.
2：Sample Selection and Data Sources:
The Terfenol-D tube is provided by Huizhou South Rare Earth Functional Material Institute Co.
3：List of Experimental Equipment and Materials:
Includes a magnetic field generator based on Helmholtz coils, a high-precision constant current source, a speaker controlled by a signal generator, and a fiber laser demodulator based on the PGC method.
4：Experimental Procedures and Operational Workflow:
The sensor is placed in a uniform magnetic field, and a sweep acoustic wave is applied to measure the resonant frequency shift of the fiber laser.
5：Data Analysis Methods:
The relationship between the resonant frequency change and the external magnetic field is analyzed to determine the sensor's sensitivity and linearity.
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