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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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Fiber Reshaping-Based Refractive Index Sensor Interrogated through Both Intensity and Wavelength Detection.
Peng Ji1, Shiru Jiang2, Sang-Shin Lee3
1Department of Electronic Engineering, Kwangwoon University, 20 Kwangwoon-ro, Nowon-gu, Seoul 01897, Korea. prl.jipeng@gmail.com.
Sensors (Basel, Switzerland)
|June 2, 2019
Summary
This study introduces a novel fiber reshaping refractive index (RI) sensor that mimics a coreless fiber. It achieves high sensitivity for detecting environmental changes using optical intensity and wavelength shifts.
Area of Science:
- Optical Engineering
- Sensor Technology
- Materials Science
Background:
- Refractive index (RI) sensing is crucial for various applications.
- Existing sensors face limitations in sensitivity and operating range.
- Fiber optic sensors offer advantages in remote and harsh environment sensing.
Purpose of the Study:
- To propose a novel fiber reshaping-based RI sensor.
- To mimic a coreless fiber structure for enhanced light-matter interaction.
- To achieve high sensitivity using both optical intensity variation and wavelength shift.
Main Methods:
- Reshaping optical fiber core to create a multimode interference (MMI) coupler.
- Utilizing leaky-mode and MMI theories for sensor analysis.
- Employing two interrogation mechanisms: intensity variation and wavelength shift.
Main Results:
- Achieved high average sensitivities of 185 dB/RIU (intensity) and 3912 nm/RIU (wavelength).
- Demonstrated sensing across a broad RI range (1.339 to 1.443).
- Showcased tunability of operating range and sensitivity by controlling interaction length.
Conclusions:
- The proposed fiber reshaping RI sensor offers high performance.
- The sensor is suitable for diverse applications in industry and bioscience.
- The dual interrogation mechanism enhances sensing capabilities.
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