Pattern matching based smart interrogation algorithm for fiber Bragg gratings inscribed by femtosecond laser

Qiaoni Wang; Yuanhong Yang; Jun He; Yiping Wang

doi:10.1117/12.2184047

1 July 2015 Pattern matching based smart interrogation algorithm for fiber Bragg gratings inscribed by femtosecond laser

Qiaoni Wang, Yuanhong Yang, Jun He, Yiping Wang

Author Affiliations +

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96552W (2015) https://doi.org/10.1117/12.2184047
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

Fiber Bragg gratings (FBGs) in gold-coated SMF have been successfully inscribed with NIR femtosecond laser and a phase mask for high temperature sensing application. The spectrums of FBGs inscribed by femtosecond laser are broader and asymmetrical with flat-toped profile which degrades the accuracy of FBGs interrogation with common peak detection techniques. A smart interrogation algorithm based on pattern matching (PMSIA) is reported in this paper. In this algorithm, an adjustable fitting spectrum template was proposed which enables the ability to suit for various spectrum patterns was proposed. The results of simulation and experiment demonstrate the noise immunity and threshold reliability of PMSIA. Less than 7pm interrogation error PMSIA was obtained even if the spectrum changes greatly in the very large sensing temperature range (up to 700°C).

Citation Download Citation

Qiaoni Wang, Yuanhong Yang, Jun He, and Yiping Wang "Pattern matching based smart interrogation algorithm for fiber Bragg gratings inscribed by femtosecond laser", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96552W (1 July 2015); https://doi.org/10.1117/12.2184047

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