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Compact Optical Fiber 3D Shape Sensor Based on a Pair of Orthogonal Tilted Fiber Bragg Gratings.

Feng D, Zhou W, Qiao X, Albert J - Sci Rep (2015)

Bottom Line: In this work, a compact fiber-optic 3D shape sensor consisting of two serially connected 2° tilted fiber Bragg gratings (TFBGs) is proposed, where the orientations of the grating planes of the two TFBGs are orthogonal.The measurement of the reflective transmission spectrum from the pair of TFBGs was implemented by Fresnel reflection of the cleaved fiber end.In the third (axial) direction, the strain is obtained directly by the shift of the TFBG Bragg wavelengths with a sensitivity of 1.06 pm/με.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Northwest University, Xi'an, 710069, China.

ABSTRACT
In this work, a compact fiber-optic 3D shape sensor consisting of two serially connected 2° tilted fiber Bragg gratings (TFBGs) is proposed, where the orientations of the grating planes of the two TFBGs are orthogonal. The measurement of the reflective transmission spectrum from the pair of TFBGs was implemented by Fresnel reflection of the cleaved fiber end. The two groups of cladding mode resonances in the reflection spectrum respond differentially to bending, which allows for the unique determination of the magnitude and orientation of the bend plane (i.e. with a ± 180 degree uncertainty). Bending responses ranging from -0.33 to + 0.21 dB/m(-1) (depending on orientation) are experimentally demonstrated with bending from 0 to 3.03 m(-1). In the third (axial) direction, the strain is obtained directly by the shift of the TFBG Bragg wavelengths with a sensitivity of 1.06 pm/με.

No MeSH data available.


Related in: MedlinePlus

The intensity response of the selected modal resonance to bending of TFBG1 (a) and TFBG2 (b) at bending orientations from 0 to 3600, respectively.
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f3: The intensity response of the selected modal resonance to bending of TFBG1 (a) and TFBG2 (b) at bending orientations from 0 to 3600, respectively.

Mentions: The amplitude (largest attenuation dip value in the spectrum, relative to the fixed level of the Bragg peak) of these two cladding modes resonances were measured for various values of the curvature for different bending azimuthal orientations between 0 and 180 degrees around the fiber axis at an interval of 22.5 degrees. Figure 3 shows a typical set of results for TFBG1 (Fig. 3(a)) and TFBG2 (Fig. 3(b)). For each orientation, the amplitude change of the cladding mode resonance demonstrates good linearity from which the bend sensitivity can be calculated. However the individual response of each grating is insufficient to determine the bending magnitude because of the orientation dependence (this problem was noted in the original paper on bend detection using TFBGs)20. But here we have two orthogonal responses and it will now be shown that a suitable combination of these two responses provides sufficient information to calculate the bend magnitude and the orientation of the bending plane (but not the absolute direction: there remains an uncertainty of ±180 degrees within the bend plane).


Compact Optical Fiber 3D Shape Sensor Based on a Pair of Orthogonal Tilted Fiber Bragg Gratings.

Feng D, Zhou W, Qiao X, Albert J - Sci Rep (2015)

The intensity response of the selected modal resonance to bending of TFBG1 (a) and TFBG2 (b) at bending orientations from 0 to 3600, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663507&req=5

f3: The intensity response of the selected modal resonance to bending of TFBG1 (a) and TFBG2 (b) at bending orientations from 0 to 3600, respectively.
Mentions: The amplitude (largest attenuation dip value in the spectrum, relative to the fixed level of the Bragg peak) of these two cladding modes resonances were measured for various values of the curvature for different bending azimuthal orientations between 0 and 180 degrees around the fiber axis at an interval of 22.5 degrees. Figure 3 shows a typical set of results for TFBG1 (Fig. 3(a)) and TFBG2 (Fig. 3(b)). For each orientation, the amplitude change of the cladding mode resonance demonstrates good linearity from which the bend sensitivity can be calculated. However the individual response of each grating is insufficient to determine the bending magnitude because of the orientation dependence (this problem was noted in the original paper on bend detection using TFBGs)20. But here we have two orthogonal responses and it will now be shown that a suitable combination of these two responses provides sufficient information to calculate the bend magnitude and the orientation of the bending plane (but not the absolute direction: there remains an uncertainty of ±180 degrees within the bend plane).

Bottom Line: In this work, a compact fiber-optic 3D shape sensor consisting of two serially connected 2° tilted fiber Bragg gratings (TFBGs) is proposed, where the orientations of the grating planes of the two TFBGs are orthogonal.The measurement of the reflective transmission spectrum from the pair of TFBGs was implemented by Fresnel reflection of the cleaved fiber end.In the third (axial) direction, the strain is obtained directly by the shift of the TFBG Bragg wavelengths with a sensitivity of 1.06 pm/με.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Northwest University, Xi'an, 710069, China.

ABSTRACT
In this work, a compact fiber-optic 3D shape sensor consisting of two serially connected 2° tilted fiber Bragg gratings (TFBGs) is proposed, where the orientations of the grating planes of the two TFBGs are orthogonal. The measurement of the reflective transmission spectrum from the pair of TFBGs was implemented by Fresnel reflection of the cleaved fiber end. The two groups of cladding mode resonances in the reflection spectrum respond differentially to bending, which allows for the unique determination of the magnitude and orientation of the bend plane (i.e. with a ± 180 degree uncertainty). Bending responses ranging from -0.33 to + 0.21 dB/m(-1) (depending on orientation) are experimentally demonstrated with bending from 0 to 3.03 m(-1). In the third (axial) direction, the strain is obtained directly by the shift of the TFBG Bragg wavelengths with a sensitivity of 1.06 pm/με.

No MeSH data available.


Related in: MedlinePlus