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Ultra-highly sensitive gas pressure sensor based on dual side-hole fiber interferometers with Vernier effect
Optics Express
|November 25, 2018
Summary
A novel fiber optic gas pressure sensor utilizes the Vernier effect for ultra-high sensitivity. This sensor enhances gas pressure detection with low temperature cross-sensitivity, valuable for industrial applications.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
- Interferometry
Background:
- Mach-Zehnder interferometers (MZIs) are widely used in sensing.
- Enhancing sensor sensitivity is crucial for precise measurements.
- The Vernier effect offers a method for signal amplification in interferometric systems.
Purpose of the Study:
- To demonstrate a fiber optic gas pressure sensor with ultra-high sensitivity.
- To leverage the Vernier effect for magnified gas pressure measurement.
- To investigate the sensor's performance regarding sensitivity and temperature cross-sensitivity.
Main Methods:
- Fabrication of the sensor using two integrated parallel Mach-Zehnder interferometers (MZIs).
- Integration of a dual side-hole fiber (DSHF) section between multimode fibers (MMFs).
- Utilizing femtosecond laser for precise modification of fiber structures to induce the Vernier effect.
Main Results:
- Achieved ultra-high gas pressure sensitivity of approximately -60 nm/MPa within the 0-0.8 MPa range.
- Demonstrated low temperature cross-sensitivity of about 0.55 KPa/°C.
- Successfully magnified gas pressure measurement through the Vernier effect.
Conclusions:
- The developed fiber optic sensor exhibits excellent sensitivity for gas pressure detection.
- The sensor's low temperature dependency makes it suitable for various environments.
- This technology holds practical value for gas pressure sensing, environmental monitoring, and industrial applications.
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