2D-S (Stereo) Probe

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Highlights of the 2D-S (Stereo) Probe

  • Two 128-photodiode linear arrays work independently as high-speed and high-resolution optical imaging probes.
  • Captures two-dimensional images of particles passing through sample volume where laser beams overlap.
  • The region where the beams overlap uniquely defines the depth-of-field (and thus the sample volume) for small particles.
  • Response time is 10 times faster than the 2D-C.
  • Particles as small as 10 microns imaged at 200 m/s.
  • Greatly improved determination of sample volume and sizing of small particles less than 100 microns.
  • Data rates up to 13 MB per second, compressed into binary file.
  • Fits in standard PMS 2D canister and uses standard wiring.

Operation and Data Analysis

  • 2D-S is extremely easy to use. Turning on power to the probe automatically starts communication with the computer. Recording a data file is as easy as one button. Real-time software displays to the operator housekeeping data and a small sampling of the particles recorded. Artificial Intelligence parameters keep the instrument operating at its best, making the instrument almost hands-free with little necessary oversight. The 2D-S has been deployed on the NCAR C-130, SPEC Lear, NASA WB57, UND DC-8, and National Research Council (Canadian) Convair.
  • SPEC's 2D-S data analysis software can calculate particle by particle dimensions yielding concentrations, extinctions, particle size distributions, ice water contents, and other microphysical properties.
    Click HERE to see papers showing how 2D-S data are used in Scientific Analysis

Large crystals observed by the 2D-S in upslope cloud at -9 °C.