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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Highly sensitive liquid-level sensor based on dual-wavelength double-ring fiber laser assisted by beat frequency
1Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Optics Express
|December 25, 2012
Summary
A novel liquid-level sensor uses a dual-wavelength fiber laser to achieve ultra-high sensitivity. This fiber optic sensor offers a stable microwave signal for precise liquid level monitoring.
Area of Science:
- Optoelectronics
- Fiber Optics Sensing
- Metamaterials
Background:
- Accurate liquid-level monitoring is crucial in various industrial and scientific applications.
- Traditional sensors often face limitations in sensitivity, stability, and environmental robustness.
Purpose of the Study:
- To propose and demonstrate a highly sensitive liquid-level sensor.
- To leverage dual-wavelength fiber laser technology for enhanced measurement capabilities.
Main Methods:
- A single-longitudinal-mode fiber laser was constructed using two parallel phase-shift fiber Bragg gratings (ps-FBGs) in a double-ring resonator.
- Dual-wavelength lasing output was utilized, and the beat frequency between the two wavelengths was monitored.
- One ps-FBG acted as the sensing element, directly bonded to a float, converting buoyancy into axial strain.
Main Results:
- A stable microwave signal with frequency stability better than 5 MHz was generated.
- The sensor achieved an ultra-high liquid-level sensitivity of 2.12 × 10^7 MHz/m over a 1.5 mm measurement range.
- The sensor demonstrated thermal insensitivity, good reliability, and stability.
Conclusions:
- The proposed dual-wavelength fiber laser sensor offers a promising solution for high-precision liquid-level detection.
- The sensor's design minimizes external components, enhancing its robustness and reliability.
- This technology has potential applications in fields requiring sensitive and stable liquid level measurements.
