Quasi-distributed temperature sensing using apodized fiber Bragg grating array

Wenjing Gao; Hao Bi; Yangjie Li; Shan Jiang; Haihu Yu; Desheng Jiang

doi:10.1117/12.2547753

20 December 2019 Quasi-distributed temperature sensing using apodized fiber Bragg grating array

Wenjing Gao, Hao Bi, Yangjie Li, Shan Jiang, Haihu Yu, Desheng Jiang

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 1120920 (2019) https://doi.org/10.1117/12.2547753
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

Drawing-tower fiber Bragg grating (FBG) array can be used in health monitoring of bridges, pipelines and some largescale projects to realize temperature, stress and vibration quasi-distributed sensing. The grating array sensing system can detect the changes of the tested physical parameters by measuring the central wavelength of the grating. However, for the sensing system based on identical grating array consisting of uniform FBGs, it cannot measure accurately the shift of the reflective wavelength of a grating in the array due to the sidelobe superposition of the gratings. Compared with uniform Bragg grating, apodized FBG has smaller reflection peak sidelobes. It means that the reflection power of the apodized FBG can be concentrated to the central wavelength region, and the reflection peak signal will be not interfered with those of other gratings. In this paper, an apodized FBG array was in-line fabricated in a single mode fiber by on a drawing tower and used for dense quasi-distributed temperature sensing. The obtained apodized FBGs have a full width at half maximum (FWHM) of 0.09 nm and their sidelobes were decreased by -21.9 dB. A 1000-meter-long array consisting of 10000 apodized gratings was successfully fabricated and used for quasi-distributed temperature sensing. These gratings have good consistency, low transmission loss and good mechanical properties. Experimental results show that the array can accurately measure quasi-distributed temperature fields and the temperature sensitivity is 10.15 pm/°C. It is expected that the apodized grating array can find more applications in many fields.

Citation Download Citation

Wenjing Gao, Hao Bi, Yangjie Li, Shan Jiang, Haihu Yu, and Desheng Jiang "Quasi-distributed temperature sensing using apodized fiber Bragg grating array", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120920 (20 December 2019); https://doi.org/10.1117/12.2547753

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KEYWORDS

Fiber Bragg gratings

Sensing systems

Reflectivity

Sensors

Multiplexing

Optical fibers

Superposition

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