Simultaneous measurement of transverse load and temperature using a single long-period fiber grating element

Yun-Jiang Rao; Yi-Ping Wang; Tao Zhu; Zeng-Lin Ran; Xiang Kai Zeng

doi:10.1117/12.481951

9 September 2002 Simultaneous measurement of transverse load and temperature using a single long-period fiber grating element

Yun-Jiang Rao, Yi-Ping Wang, Tao Zhu, Zeng-Lin Ran, Xiang Kai Zeng

Author Affiliations +

Proceedings Volume 4920, Advanced Sensor Systems and Applications; (2002) https://doi.org/10.1117/12.481951
Event: Photonics Asia, 2002, Shanghai, China

Abstract

In this paper, a single long-period fiber grating (LPFG) element written by focused high-frequency CO2 laser pulses is demonstrated for simultaneous measurement of transverse load and temperature, for the first time, to our knowledge. Temperature and transverse load can be directly measured by detecting the resonant wavelength shift and the resonant peak amplitude change of the LPFG respectively, as there are two special circular orientations along the fiber axis where the resonant peak amplitude change of the LPFG has a linear relationship with the load applied and is insensitive to the resonant wavelength shift. Such a sensor could solve the cross-sensitivity problem between transverse load and temperature due to the unique feature of this type of LPFG, i.e. the wavelength-load-sensitivity of the LPFG strongly depends on loading orientations due to the non-uniform distribution of the refractive index on the cross-section of the LPFG caused by the thermal shock effect and other effects of the high-frequency CO2 laser pulses exposure method used.

Citation Download Citation

Yun-Jiang Rao, Yi-Ping Wang, Tao Zhu, Zeng-Lin Ran, and Xiang Kai Zeng "Simultaneous measurement of transverse load and temperature using a single long-period fiber grating element", Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); https://doi.org/10.1117/12.481951

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