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High Temperature High Sensitivity Multipoint Sensing System Based on Three Cascade Mach⁻Zehnder Interferometers.

Na Zhao1, Qijing Lin2,3,4,5, Zhuangde Jiang6

  • 1State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China. zn2015@stu.xjtu.edu.cn.

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Summary

This study introduces a novel multipoint temperature sensing system using three cascaded Mach-Zehnder interferometers (MZIs). The system accurately measures temperature variations up to 1000 °C, offering a new solution for MZI cascade challenges.

Keywords:
Mach–Zehnder interferometercascadefiber bitapershigh temperature sensing

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Area of Science:

  • Optoelectronics
  • Fiber optic sensing
  • Interferometry

Background:

  • Multipoint temperature sensing is crucial for various industrial and scientific applications.
  • Cascaded Mach-Zehnder interferometers (MZIs) offer potential for complex sensing but face challenges in signal processing and analysis.
  • Accurate and reliable temperature monitoring across different regions requires advanced sensing systems.

Purpose of the Study:

  • To introduce a novel temperature multipoint sensing system utilizing three cascaded Mach-Zehnder interferometers (MZIs).
  • To demonstrate the feasibility of accurately measuring temperature variations in distinct regions using a single MZI cascade.
  • To provide a new solution for addressing the challenges associated with cascading MZIs for sensing applications.

Main Methods:

  • Fabrication of MZIs with varying lengths using waist-enlarged fiber bitapers.
  • Application of fast Fourier transformation (FFT) to overlapping transmission spectra.
  • Utilizing inverse Fourier transformation to obtain individual interference spectra from the cascaded frequency spectrum.
  • Analysis of interference spectra drift to determine temperature sensitivities.

Main Results:

  • Successfully fabricated cascaded MZIs with distinct lengths.
  • Achieved temperature response sensitivities of 0.063 nm/°C, 0.071 nm/°C, and 0.059 nm/°C.
  • Demonstrated accurate temperature detection from room temperature up to 1000 °C.
  • Validated multipoint temperature measurement capability through a sensitivity matrix equation.

Conclusions:

  • The developed temperature sensing system based on cascaded MZIs is feasible for multipoint measurements.
  • The system provides an innovative solution to the MZI cascade problem in optical sensing.
  • This technology has the potential for advanced temperature monitoring in diverse environments.