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High-Resolution Optical Fiber Temperature Sensor Based on Draw Tower Grating Array.

Hanjie Liu1, Ciming Zhou1,2, Yandong Pang3

  • 1School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China.

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|April 23, 2022
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Summary

A novel fiber optic sensor using a Fabry-Pérot interferometer and fiber Bragg gratings (FBGs) offers high-resolution ocean temperature monitoring. This system overcomes limitations of traditional sensors, enabling large-scale multiplexing for marine applications.

Keywords:
fiber optical sensorsinterferometersoceanographyphase modulationtemperature measurement

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Area of Science:

  • Marine Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Ocean temperature monitoring is crucial for marine industries like fishing and aquaculture.
  • Traditional electric sensors face limitations including electromagnetic interference and lack of multiplexing capabilities.
  • Fiber Bragg grating (FBG) sensors offer high sensitivity, multiplexing potential, and immunity to electromagnetic interference.

Purpose of the Study:

  • To propose and demonstrate a new fiber optic sensor system for ocean temperature monitoring.
  • To leverage a Fabry-Pérot interferometer with a draw tower grating array for enhanced performance.
  • To achieve high temperature resolution and large-scale multiplexing capabilities for marine applications.

Main Methods:

  • A Fabry-Pérot interferometer sensor unit was constructed using two adjacent FBGs as mirrors connected by an optical fiber.
  • Phase measurement in an unbalanced interferometer compensated for optical path differences to detect the signal.
  • The sensor was calibrated against a thermocouple (DW1222) reference in the temperature range of 36.00-36.50 °C.

Main Results:

  • A linear relationship between temperature and phase was observed with a Pearson square correlation coefficient of 0.9996.
  • The system demonstrated a high temperature sensitivity of -9846 rad/°C.
  • The system achieved an ultrahigh temperature resolution on the order of 10-5 °C.

Conclusions:

  • The proposed Fabry-Pérot interferometer sensor system shows significant promise for accurate ocean temperature detection.
  • The sensor's design, utilizing FBG ultraweak reflections, enables large-scale multiplexing for comprehensive monitoring.
  • This technology offers a robust alternative to traditional sensors, addressing limitations in marine operational environments.