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Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation.

Xia J, Wang Q, Liu X, Luo H - Sensors (Basel) (2015)

Bottom Line: An optical fiber current sensor based on Fabry-Perot interferometer using a fiber Bragg grating demodulation is proposed.The corresponding reflective power of the FBG will change with different external current intensity, due to the shift on the interference spectrum of the F-P interferometer.Experimental results show that an optimal sensitivity of 0.8522 nw/A and measurement resolution of 0.001 A is obtained with a FBG at 1550 nm with 99% reflectivity.

View Article: PubMed Central - PubMed

Affiliation: Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, China. blovexiaji@163.com.

ABSTRACT
An optical fiber current sensor based on Fabry-Perot interferometer using a fiber Bragg grating demodulation is proposed. Magnetic fluid is used as a sensitive medium in fiber optical Fabry-Perot (F-P) cavity for the optical characteristic of magnetic-controlled refractive index. A Fiber Bragg grating (FBG) is connected after the F-P interferometer which is used to reflect the optical power at the Bragg wavelength of the interference transmission spectrum. The corresponding reflective power of the FBG will change with different external current intensity, due to the shift on the interference spectrum of the F-P interferometer. The sensing probe has the advantages of convenient measurement for its demodulation, low cost and high current measurement accuracy on account of its sensing structure. Experimental results show that an optimal sensitivity of 0.8522 nw/A and measurement resolution of 0.001 A is obtained with a FBG at 1550 nm with 99% reflectivity.

No MeSH data available.


Related in: MedlinePlus

Relationship between light power of the interference with a FBG versus current.
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sensors-15-16632-f006: Relationship between light power of the interference with a FBG versus current.

Mentions: Figure 6 showed the reflective power of the interference with FBG at the Bragg wavelength of 1550 nm and the cavity length of 24 μm, which was measured by the power meter. It was discussed by three cycles’ data of increasing and decreasing current. The relationship between the reflective power of the F-P interferometer with a FBG and the measured current can be best fitted as a function such as. The fitting degree is as high as. Hence, a sensitivity of 0.8522 nW/A was obtained. Moreover, as the resolution of power meter is 0.001 nW, the resolution of the system towards can be 0.001 A. As for the relationship between magnetic field intensity and current, it can also obtain a sensitivity of 0.0118 nW/G, which is suitable for the measurement of magnetic flux density.


Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation.

Xia J, Wang Q, Liu X, Luo H - Sensors (Basel) (2015)

Relationship between light power of the interference with a FBG versus current.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541897&req=5

sensors-15-16632-f006: Relationship between light power of the interference with a FBG versus current.
Mentions: Figure 6 showed the reflective power of the interference with FBG at the Bragg wavelength of 1550 nm and the cavity length of 24 μm, which was measured by the power meter. It was discussed by three cycles’ data of increasing and decreasing current. The relationship between the reflective power of the F-P interferometer with a FBG and the measured current can be best fitted as a function such as. The fitting degree is as high as. Hence, a sensitivity of 0.8522 nW/A was obtained. Moreover, as the resolution of power meter is 0.001 nW, the resolution of the system towards can be 0.001 A. As for the relationship between magnetic field intensity and current, it can also obtain a sensitivity of 0.0118 nW/G, which is suitable for the measurement of magnetic flux density.

Bottom Line: An optical fiber current sensor based on Fabry-Perot interferometer using a fiber Bragg grating demodulation is proposed.The corresponding reflective power of the FBG will change with different external current intensity, due to the shift on the interference spectrum of the F-P interferometer.Experimental results show that an optimal sensitivity of 0.8522 nw/A and measurement resolution of 0.001 A is obtained with a FBG at 1550 nm with 99% reflectivity.

View Article: PubMed Central - PubMed

Affiliation: Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, China. blovexiaji@163.com.

ABSTRACT
An optical fiber current sensor based on Fabry-Perot interferometer using a fiber Bragg grating demodulation is proposed. Magnetic fluid is used as a sensitive medium in fiber optical Fabry-Perot (F-P) cavity for the optical characteristic of magnetic-controlled refractive index. A Fiber Bragg grating (FBG) is connected after the F-P interferometer which is used to reflect the optical power at the Bragg wavelength of the interference transmission spectrum. The corresponding reflective power of the FBG will change with different external current intensity, due to the shift on the interference spectrum of the F-P interferometer. The sensing probe has the advantages of convenient measurement for its demodulation, low cost and high current measurement accuracy on account of its sensing structure. Experimental results show that an optimal sensitivity of 0.8522 nw/A and measurement resolution of 0.001 A is obtained with a FBG at 1550 nm with 99% reflectivity.

No MeSH data available.


Related in: MedlinePlus