FBG demodulation method based on long-period fiber gratings

LIU Qiang; LI Binwen; SUN Yudan; LIU Chao; LIU Wei; FU Tianshu; ZHAO Jin; TAI Shengnan

doi:10.5768/JAO202243.0108002

Journal of Applied Optics > 2022 > 43(1): 160-166. > DOI: 10.5768/JAO202243.0108002

LIU Qiang, LI Binwen, SUN Yudan, LIU Chao, LIU Wei, FU Tianshu, ZHAO Jin, TAI Shengnan. FBG demodulation method based on long-period fiber gratings[J]. Journal of Applied Optics, 2022, 43(1): 160-166. DOI: 10.5768/JAO202243.0108002

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FBG demodulation method based on long-period fiber gratings

1.
School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing 163318, China
2.
School of Mechatronics Engineering, Daqing Normal University, Daqing 163712, China

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Received Date: July 29, 2021
Revised Date: September 12, 2021
Accepted Date: November 07, 2021
Available Online: November 09, 2021

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Abstract

Abstract

The demodulation method of fiber Bragg gratings (FBG) based on long-period fiber gratings (LPFG) was studied. The transmission spectrum of LPFG was used as the edge filter to demodulate the FBG, and the demodulation performance mainly depended on the transmission spectrum depth of LPFG. The influence of CO₂ laser writing technique on the transmission spectrum was analyzed in detail, and the LPFG with transmission spectrum depth of 25 dB was manufactured and used as the FBG demodulation device. The demodulation system was built with the FBG pasted on the surface of the metal strain sheet. The static and dynamic response of the sensing system was tested. The experimental results show that the proposed method has the advantages of simple production process, low cost, good linear dynamic range and higher sensitivity.
- fiber Bragg gratings demodulation,
- long-period fiber gratings,
- edge filter,
- sensor

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References (17)

References

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FBG demodulation method based on long-period fiber gratings