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High-Resolution and Large-Sensing-Range Liquid-Level Sensor Based on Optical Frequency Domain Reflectometry and
Guolu Yin1,2, Pengxi Yang1, Hu Xiao1
1Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China.
Sensors (Basel, Switzerland)
|June 24, 2022
Summary
This study introduces a novel optical liquid-level sensor using no-core fiber and optical frequency domain reflectometry. This advanced sensor offers high resolution and stability for precise liquid level monitoring in demanding applications.
Area of Science:
- Photonics and Sensing Technologies
- Optical Fiber Sensing
- Industrial Instrumentation
Background:
- Liquid-level sensors are critical in industrial and medical applications.
- Traditional electrical sensors pose safety concerns.
- Optical sensors offer a safer alternative, driving research interest.
Purpose of the Study:
- To develop a distributed liquid-level sensor utilizing optical frequency domain reflectometry (OFDR) and no-core fiber.
- To address safety limitations of conventional electrical sensors.
- To provide a high-performance sensing solution for various environments.
Main Methods:
- Employing optical frequency domain reflectometry (OFDR) for sensing.
- Utilizing a no-core fiber to capture evanescent field reflections at the liquid-air interface.
- Demonstrating the sensor's performance through experimental validation.
Main Results:
- Achieved a high resolution of 0.1 mm and stability of ±15 μm.
- Demonstrated a measurement range of 175 mm with a signal-to-noise ratio (SNR) of 30 dB.
- Extended sensing length to 1.25 m, maintaining an SNR of 10 dB.
Conclusions:
- The proposed optical liquid-level sensor offers high precision and a significant measurement range.
- The technology shows promise for applications in intelligent industries and extreme environments.
- This OFDR-based no-core fiber sensor presents a viable, safe alternative to traditional methods.
