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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 F-P interference with cavity length of 24μm.
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sensors-15-16632-f004: Signals of F-P interference with cavity length of 24μm.

Mentions: From Figure 3, we can see that all channels of signals could be demodulated when the Bragg wavelength is 1555 nm. Here, the sensitivity of 0.75 nW/A was obtained by fitting the light power at the Bragg wavelength and refractive index. In some practical application, a high sensitivity is demanded and a good degree of linearity is needed. So in the next, a cavity length of 24 μm was set in order to increase the sensitivity and achieve good linearity. However, at the same time, the variation range of refractive index would be decreased inevitably, which means the measurement range would be diminished. Here, the Bragg wavelength was 1550 nm which was easy to fabricate, and the sensitivity was simulated to be enhanced to 1.5 nW/A. The interference spectrum is shown in Figure 4.


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 F-P interference with cavity length of 24μm.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-16632-f004: Signals of F-P interference with cavity length of 24μm.
Mentions: From Figure 3, we can see that all channels of signals could be demodulated when the Bragg wavelength is 1555 nm. Here, the sensitivity of 0.75 nW/A was obtained by fitting the light power at the Bragg wavelength and refractive index. In some practical application, a high sensitivity is demanded and a good degree of linearity is needed. So in the next, a cavity length of 24 μm was set in order to increase the sensitivity and achieve good linearity. However, at the same time, the variation range of refractive index would be decreased inevitably, which means the measurement range would be diminished. Here, the Bragg wavelength was 1550 nm which was easy to fabricate, and the sensitivity was simulated to be enhanced to 1.5 nW/A. The interference spectrum is shown in Figure 4.

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