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    Area of Science:

    • Optics and Photonics
    • Fluid Dynamics
    • Microfluidics

    Background:

    • Microscale flow sensing is crucial for various applications.
    • Optical Feedback Interferometry (OFI) offers potential for precise flow measurements.
    • Understanding optical effects in microchannels is key to sensor optimization.

    Purpose of the Study:

    • To theoretically and experimentally investigate OFI performance for microscale flow sensing.
    • To present a novel numerical modeling approach for OFI flow meter spectrum reproduction.
    • To analyze the impact of micro-scale channel geometry on OFI signals.

    Main Methods:

    • Theoretical analysis of OFI principles.
    • Experimental setup for microscale flow measurement.
    • Development of a numerical model for OFI spectrum reproduction.
    • Investigation of optical effects related to channel geometry.

    Main Results:

    • Identified two distinct frequency peaks in the OFI spectrum.
    • Attributed spectral peaks to the reflection of forward scattered light.
    • Demonstrated accurate flow rate measurements from 16.8 mm/s to 168 mm/s.
    • Validated the numerical modeling approach for spectrum reproduction.

    Conclusions:

    • OFI is a promising technology for accurate microscale flow sensing.
    • The developed numerical model aids in understanding and optimizing OFI microfluidic sensors.
    • The study provides a foundation for further advancements in OFI-based microfluidic systems.