Design and characteristic research on side-polished fiber fluid sensing system
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Chongqing Engineering Research Center of Intelligent Sensing Technology and Microsystem, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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    Abstract:

    A novel fluid sensing system based on side-polished optical fiber (SPOF) is proposed, which realizes the fluid replaceability and effective refractive index (RI) sensing characteristics. Numerical investigations demonstrate that the photonic bandgap effect can be obtained if the RI of liquid is higher than that of substrate material in the wavelength range studied. The relationship between bandgap edge wavelength and RI is studied theoretically. The SPOF with a depth of 57 μm is used in the experiment to realize the construction of the fluid channel. After filling three different liquids, the result shows that the wavelength of the bandgap edge has a red shift with RI increased, which is nearly linear in the RI range of 1.56—1.6 with a sensitivity about 5 543.64 nm/RIU. The proposed sensing system can be flexibly applied to the field of fluid characteristic sensing such as biochemical solution characteristic detections.

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LIU Yu, YANG Qingrong, LU Yongle, DI Ke, WEN Dandan, YUE Yiting, ZHOU Min, WANG Changle, GUO Junqi. Design and characteristic research on side-polished fiber fluid sensing system[J]. Optoelectronics Letters,2021,17(8):490-495

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History
  • Received:November 14,2020
  • Revised:December 17,2020
  • Online: July 09,2021
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