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Cai Sun, Yuan-Jun Li, He-Er Yang, Xue-Peng Pan, Shan-Ren Liu, Bo Wang, Meng-Meng Gao, Qi Guo, Yong-Sen Yu. Preparation and Sensing Characteristics of Long-Period Fiber Gratings Based on Periodic Microchannels[J]. Chinese Optics. doi: 10.37188/CO.EN.2024-0005
Citation: Cai Sun, Yuan-Jun Li, He-Er Yang, Xue-Peng Pan, Shan-Ren Liu, Bo Wang, Meng-Meng Gao, Qi Guo, Yong-Sen Yu. Preparation and Sensing Characteristics of Long-Period Fiber Gratings Based on Periodic Microchannels[J]. Chinese Optics. doi: 10.37188/CO.EN.2024-0005

Preparation and Sensing Characteristics of Long-Period Fiber Gratings Based on Periodic Microchannels

doi: 10.37188/CO.EN.2024-0005
  • Received Date: 02 Feb 2024
  • Rev Recd Date: 02 Mar 2024
  • Accepted Date: 07 Mar 2024
  • Available Online: 19 Mar 2024
  • Long period fiber gratings have the advantages of small size, corrosion resistance, anti-electromagnetic interference and high sensitivity, making them widely used in biomedical, power industry and aerospace. In this paper, a long period fiber grating sensor based on periodic microchannels is proposed. Firstly, a series of linear structures are etched in the cladding of a single-mode fiber by femtosecond laser micromachining. Then the laser-modified region is selectively eroded by selective chemical etching to obtain the periodic microchannel structure. Finally, the channels are filled with polydimethylsiloxane (PDMS) to improve the spectral quality. The temperature sensitivity is -55.19 pm/°C, the strain sensitivity is -3.19 pm/με, the maximum refractive index sensitivity is 540.28 nm/RIU and the bending sensitivity is 2.65 dB/m-1. And all of them show good linear response. The sensor has good application prospects in the field of precision measurement and sensing.

     

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