Optical spectral intensity-based interrogation technique for liquid-level interferometric fiber sensors

Area of Science:

• Optoelectronics
• Fiber optic sensing
• Metrology

Background:

• Interferometric fiber sensors are crucial for various applications.
• Current interrogation methods have limitations in range and distributed sensing.
• Accurate liquid-level monitoring is essential in industrial and scientific fields.

Purpose of the Study:

• To introduce a new technique for interrogating liquid-level interferometric fiber sensors.
• To enhance the capability of fiber sensors for distributed and long-range measurements.
• To provide an alternative, robust method for liquid-level sensing.

Main Methods:

• Measurement and analysis of interference pattern intensity.
• Utilizing calculations considering numerous spectral peaks and dips.
• Experimental validation of the proposed interrogation technique.

Main Results:

• Demonstrated a new technique for liquid-level interferometric fiber sensors.
• Achieved experimental liquid-level measurements up to 120 mm.
• Obtained high linearity and a sensitivity of -0.042 dB/mm.

Conclusions:

• The proposed intensity-based analysis offers a viable alternative for fiber sensor interrogation.
• This method supports distributed sensing and extended measurement ranges.
• The technique shows promise for precise and reliable liquid-level monitoring.