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Self-mixing flow sensor using a monolithic VCSEL array with parallel readout.

Yah Leng Lim1, Russell Kliese, Karl Bertling

  • 1School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. ylim@itee.uq.edu.au

Optics Express
|July 1, 2010
PubMed
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This study presents a parallel self-mixing flow velocity sensing system using a Vertical-Cavity Surface-Emitting Laser (VCSEL) array. This compact, high-resolution sensor offers faster fluid flow imaging with reduced system complexity.

Area of Science:

  • Optoelectronics
  • Fluid Dynamics
  • Sensing Technology

Background:

  • Self-mixing sensing is a compact interferometric technique for fluid flow measurement.
  • Existing methods may lack speed or resolution for full-field imaging.

Purpose of the Study:

  • To demonstrate a parallel readout self-mixing flow velocity sensing system.
  • To achieve high-resolution, high frame-rate fluid flow imaging.

Main Methods:

  • Utilized a monolithic Vertical-Cavity Surface-Emitting Laser (VCSEL) array for parallel sensing.
  • Acquired self-mixing signals from VCSEL junction voltage variations.
  • Validated the system using a custom diverging-converging planar flow channel.

Main Results:

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  • Achieved high-resolution, full-field imaging with electronic scanning.
  • Demonstrated faster acquisition rates compared to mechanical scanning systems.
  • Obtained velocity distribution results that align well with simulations.

Conclusions:

  • The developed parallel self-mixing sensor system is feasible.
  • This technology enables high frame-rate and high-resolution fluid flow sensing.
  • Reduced system complexity through direct voltage signal acquisition.