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Related Experiment Video

Updated: Jun 3, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

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Enhanced Vernier Effect in Cascaded Fiber Loop Interferometers for Improving Temperature Sensitivity.

Jianming Zhou1,2, Yanyan Zhi1,2, Junyi Zhang1,2

  • 1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communication, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

Sensors (Basel, Switzerland)
|January 11, 2025
PubMed
Summary

This study introduces an enhanced Vernier effect for high-sensitivity temperature sensing using cascaded fiber loop interferometers. The novel system significantly boosts temperature sensitivity, enabling advanced applications in biometrics and smart cities.

Keywords:
enhanced Vernier effectmicrowave photonicsoptical fiber sensortemperature sensor

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Last Updated: Jun 3, 2025

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Area of Science:

  • Photonics and Optical Sensing
  • Interferometry
  • Fiber Optic Sensors

Background:

  • High-sensitivity temperature sensors are crucial for various applications.
  • Traditional Vernier effect sensors face limitations in sensitivity improvement due to restricted Free Spectrum Range (FSR) variations.
  • Existing optical carrier-based microwave interferometry (OCMI) systems have lower sensitivity.

Purpose of the Study:

  • To develop a novel high-sensitivity temperature sensing system.
  • To overcome the sensitivity limitations of traditional Vernier effect sensors.
  • To leverage an enhanced Vernier effect in cascaded fiber loop interferometers.

Main Methods:

  • Implementation of an enhanced Vernier effect using two fiber loop interferometers and a single-mode fiber.
  • Formation of a Vernier spectral response with two complementary optical filter responses.
  • Exploitation of temperature-induced changes in FSRs to amplify the difference, creating the enhanced Vernier effect.

Main Results:

  • The enhanced Vernier effect system achieved a temperature sensitivity of 618.14 kHz/°C.
  • This represents a 92-fold increase compared to OCMI systems.
  • Sensitivity is 2.07 times higher than traditional Vernier effect systems, significantly outperforming the traditional -298.29 kHz/°C.

Conclusions:

  • The proposed enhanced Vernier effect scheme offers a significant advancement in temperature sensing sensitivity.
  • Cascaded fiber loop interferometers provide a robust platform for high-performance optical sensing.
  • This technology holds potential for applications in biometrics, smart cities, and the Internet of Things (IoT).