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Optical fiber vector flow sensor based on a silicon Fabry-Perot interferometer array.

Guigen Liu, Qiwen Sheng, Weilin Hou

|December 23, 2016

Summary

This summary is machine-generated.

This study introduces a novel miniature fiber-optic sensor using silicon Fabry-Perot interferometers (FPIs) to measure water vector flow. The sensor accurately determines flow speed and direction by analyzing temperature changes induced by a laser.

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Last Updated: Jan 12, 2026

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Area of Science:

Optoelectronics
Fluid Dynamics
Sensor Technology

Background:

Accurate measurement of fluid flow vectors is crucial in various scientific and engineering applications.
Existing flow sensors often face limitations in miniaturization, sensitivity, or directional measurement capabilities.

Purpose of the Study:

To develop and demonstrate a miniature fiber-optic sensor for vector water flow measurement.
To utilize an array of silicon Fabry-Perot interferometers (FPIs) for precise flow sensing.

Main Methods:

Fabrication of a sensor head comprising four silicon Fabry-Perot interferometers (FPIs).
Heating the central FPI using a continuous-wave (cw) laser at 980 nm.
Analyzing the wavelength shifts of the FPIs to deduce the temperature distribution and infer flow vector characteristics.

Main Results:

The temperature distribution within the sensor head is shown to be dependent on the water flow vector (speed and direction).
Wavelength shifts from the four FPIs allow for the deduction of the flow vector.
Theoretical analysis and experimental validation confirm the sensor's operating principle.

Conclusions:

A miniature fiber-optic water vector flow sensor based on silicon FPIs has been successfully demonstrated.
The sensor offers a novel approach for simultaneous measurement of flow speed and direction.
This technology holds potential for advanced fluid dynamics research and various industrial applications.