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Fiber-Optic Liquid Level Sensing by Temperature Profiling with an FBG Array.

Francesco Barone1, Alessandro Signorini2, Laurent Ntibarikure3

  • 1Scuola Superiore Sant'Anna, TeCIP Institute; Via Giuseppe Moruzzi 1, 56127 Pisa, Italy. francesco.barone@santannapisa.it.

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Summary
This summary is machine-generated.

A new fiber-optic sensor uses temperature differences to accurately measure liquid levels in containers. This innovative system, utilizing a fiber Bragg grating (FBG) array, offers precise monitoring for applications like turbomachinery.

Keywords:
FBGdistributed temperature sensorsoptical fiber sensor, liquid level sensortemperature

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Area of Science:

  • Instrumentation and Measurement
  • Optical Sensing Technologies
  • Thermal Analysis

Background:

  • Accurate liquid level measurement is crucial in various industrial processes.
  • Traditional methods can be limited by factors such as corrosivity, pressure, or temperature.
  • Developing non-invasive and robust sensing techniques is an ongoing challenge.

Purpose of the Study:

  • To introduce a novel fiber-optic system for non-invasive liquid level measurement.
  • To investigate the use of fiber Bragg grating (FBG) arrays for thermal profiling.
  • To model, experimentally validate, and optimize algorithms for liquid level extraction.

Main Methods:

  • Employing a fiber-optic system with a fiber Bragg grating (FBG) array to capture the temperature profile along the fiber.
  • Utilizing the temperature differential between liquid and gas phases to infer liquid level.
  • Developing and comparing algorithms for accurate liquid level estimation from temperature data.
  • Analyzing the impact of air convection on measurement accuracy and sensor performance.

Main Results:

  • The system successfully measures liquid levels by analyzing temperature gradients.
  • Different algorithms were evaluated, showing varying levels of accuracy in liquid level extraction.
  • Air convection was identified as a significant factor influencing temperature profiles and estimation accuracy.
  • Dynamic response measurements provided insights into the sensor's response time.

Conclusions:

  • The described fiber-optic FBG sensor system provides a viable method for liquid level measurement.
  • The system's accuracy is influenced by thermal gradients and air convection, requiring careful algorithm selection and system design.
  • Potential applications include turbomachinery monitoring and other industrial processes requiring precise level sensing.