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Transverse-load characteristics of twisted long-period fibre gratings written by high-frequency CO2 laser pulses

Transverse-load characteristics of twisted long-period fibre gratings written by high-frequency CO2 laser pulses

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The transverse-load characteristics of a twisted long-period fibre grating (LPFG) written by high-frequency CO2 laser pulses are investigated for the first time to the authors' knowledge. It is observed that such a twisted LPFG can weaken the strong orientation-dependence of the transverse load and enhance the transverse-load sensitivity considerably, when compared with a torsion-free LPFG, offering the potential for use as a dynamic load sensor by means of simple intensity detection.

References

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      • Y.J. Rao , Y.P. Wang . Novel fiber-optic sensors based on long-period fiber gratings written by high-frequency CO2 laser pulses. J. Lightwave Technol. , 5 , 1320 - 1325
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      • Rao, Y.J., Li, J.Y., Zhu, T.: `High temperature characteristics of long-period fiber gratings written by high-frequency CO', 20thCongress of the International Commission for Optics (ICO20), 2005, Changchun, China, Proc. SPIE (in press).
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      • Ahn, T.J., Kim, B.H., Lee, B.H.: `Torsion sensing characteristics of optical fiber with a long-period grating pair', Proc. SPIE, 2001, 4579, p. 154–161, Asica-Pacific Optical and Wireless Communications.
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