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A highly-integrated fiber fluid sensing system of metal ion concentrations with resistance to temperature crosstalk
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1.Chongqing University of Post and Telecommunication;2.Chongqing Key Laboratory of Autonomous Navigation and Microsystem，Chongqing University of Post and Telecommunication;3.Navigation College, Jimei University;4.Higher School of Engineering and Technology, Information Technologies, Mechanics and Optics University, Saint Petersburg;5.Chongqing Key Laboratory of Autonomous Navigation and Microsystem, Chongqing University of Post and Telecommunications;6.Harbin Institute of Technology

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    Abstract:

    To address the temperature cross-talk issue in detecting heavy metal ions in natural waters, a highly-integrated and fully fiber-optic metal ion sensing system capable of temperature-concentration decoupling measurement has been designed. This system integrates a fluidic detection structure assisted by side-polished fibers with a Sagnac inter-ferometer. By selecting common refractive index ranges of contaminated water sources and common environmental temperature ranges, numerical simulations were conducted to analyze the sensing characteristics of the photonic bandgap boundary and interference spectrum wavelength in relation to these two parameters, and finally, a tem-perature and refractive index decoupling model was obtained. Results show that this system successfully demod-ulates the temperature parameter in solution refractive index sensing, exhibiting a concentration sensitivity of -355.96 nm/(mol/mL) and a temperature interference of -2.03 nm/°C.

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History
  • Received:September 30,2024
  • Revised:October 16,2024
  • Adopted:October 23,2024
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