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Quasi-achromatic laser Doppler anemometry systems based on a diffractive beam splitter.

Steven Richard Kitchen1, Carsten Dam-Hansen, Michael Linde Jakobsen

  • 1Kamstrup A/S, DK-8660 Skanderborg, Denmark.

Applied Optics
|October 8, 2003
PubMed
Summary

A novel beam-splitter system enables wavelength-independent operation for laser Doppler anemometry (LDA) using non-stabilized laser diodes. This innovation ensures passive wavelength compensation for fringe spacing, simplifying LDA system design and reducing costs.

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Area of Science:

  • Optics and Photonics
  • Fluid Dynamics Measurement

Background:

  • Laser Doppler anemometry (LDA) typically requires stabilized laser sources for accurate measurements.
  • Wavelength dependency of beam splitters can complicate LDA system calibration and performance.

Purpose of the Study:

  • To develop a wavelength-independent beam-splitter system for LDA.
  • To enable the use of non-stabilized laser diodes in LDA systems.
  • To achieve passive wavelength compensation for fringe spacing.

Main Methods:

  • Designed a beam splitter using two linear diffraction gratings.
  • Utilized wavelength-dependent beam spacing for passive compensation.
  • Implemented gratings as surface-relief holograms in photoresist for mass production.
  • Theoretically and experimentally validated the passive wavelength compensation method.

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Main Results:

  • Demonstrated a beam-splitter system that is independent of laser wavelength.
  • Achieved passive compensation for fringe spacing in the measurement volume.
  • Showcased the ability to design desired fringe spacing by adjusting grating distance and lens focal length.
  • Confirmed theoretical predictions through experimental validation.

Conclusions:

  • The proposed beam-splitter system effectively eliminates wavelength dependency in LDA.
  • Non-stabilized laser diodes can be reliably used with this new LDA beam-splitter.
  • The system offers a cost-effective and scalable solution for LDA applications through holographic replication.