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High-speed Particle Image Velocimetry Near Surfaces
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Two-dimensional imaging velocity interferometry: data analysis techniques.

David J Erskine1, R F Smith, C A Bolme

  • 1Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA. erskine1@llnl.gov

The Review of Scientific Instruments
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PubMed
Summary
This summary is machine-generated.

This study introduces a snapshot 2D-VISAR technique for 2D target motion measurement using dual interferometers and ultrashort pulses. This method overcomes limitations of conventional velocity interferometer systems for any reflector (VISARs).

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Area of Science:

  • Physics
  • Optical Engineering
  • Materials Science

Background:

  • Conventional velocity interferometer systems for any reflector (VISARs) measure target velocity history but lack 2D imaging capabilities.
  • Standard VISARs are incompatible with ultrashort pulsed illumination due to coherence length limitations, hindering dynamic measurements.
  • Measuring 2D target motion at a single moment is crucial for understanding complex dynamic events.

Purpose of the Study:

  • To present a novel interferometric technique for snapshot 2D velocity measurements.
  • To enable dynamic target motion analysis with ultrashort pulsed illumination.
  • To overcome the limitations of conventional VISARs in 2D and ultrashort pulse applications.

Main Methods:

  • Utilized dual matched interferometers for low or incoherent illumination, including ultrashort laser pulses.
  • Employed quadrature phase recording and push-pull data analysis.
  • Developed a method to convert a fringing image into a 2D-phase map proportional to target velocity.

Main Results:

  • Successfully demonstrated a snapshot 2D-VISAR technique capable of measuring target motion in two dimensions.
  • Achieved motion freezing with ultrashort laser pulses, allowing the use of slow CCD imaging detectors.
  • Obtained example data on shocked crystalline [111] Si, revealing incipient features of approximately 50 μm scale.

Conclusions:

  • The developed snapshot 2D-VISAR is a viable technique for high-resolution 2D dynamic motion measurement.
  • This method significantly advances the capabilities of interferometric velocimetry for shock physics and materials science.
  • The technique opens new possibilities for studying transient phenomena in various scientific fields.