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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

Signals of interference under different current intensity.
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sensors-15-16632-f005: Signals of interference under different current intensity.

Mentions: In the experiment, the transmission spectrum of the interference has a red-shift with the magnetic field increase. At the Bragg wavelength of FBG, the reflective intensity increased accordingly when the interference spectrum has a red-shift. Figure 5 shows the reflection spectrums of the interference when external current was changed from 0A to 5.5A, which were measured with an OSA in order to see the whole condition of interference.


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)

Signals of interference under different current intensity.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-16632-f005: Signals of interference under different current intensity.
Mentions: In the experiment, the transmission spectrum of the interference has a red-shift with the magnetic field increase. At the Bragg wavelength of FBG, the reflective intensity increased accordingly when the interference spectrum has a red-shift. Figure 5 shows the reflection spectrums of the interference when external current was changed from 0A to 5.5A, which were measured with an OSA in order to see the whole condition of interference.

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