The 2D-S (Stereo) Probe: Design and Preliminary Tests of a New Airborne, High-Speed, High-Resolution Particle Imaging ProbeSource: Journal of Atmospheric and Oceanic Technology:;2006:;volume( 023 ):;issue: 011::page 1462Author:Lawson, R. Paul
,
O’Connor, Darren
,
Zmarzly, Patrick
,
Weaver, Kim
,
Baker, Brad
,
Mo, Qixu
,
Jonsson, Haflidi
DOI: 10.1175/JTECH1927.1Publisher: American Meteorological Society
Abstract: The design, laboratory calibrations, and flight tests of a new optical imaging instrument, the two-dimensional stereo (2D-S) probe, are presented. Two orthogonal laser beams cross in the middle of the sample volume. Custom, high-speed, 128-photodiode linear arrays and electronics produce shadowgraph images with true 10-?m pixel resolution at aircraft speeds up to 250 m s?1. An overlap region is defined by the two laser beams, improving the sample volume boundaries and sizing of small (100 ?m) particles, compared to conventional optical array probes. The stereo views of particles in the overlap region can also improve determination of three-dimensional properties of some particles. Data collected by three research aircraft are examined and discussed. The 2D-S sees fine details of ice crystals and small water drops coexisting in mixed-phase cloud. Measurements in warm cumuli collected by the NCAR C-130 during the Rain in Cumulus over the Ocean (RICO) project provide a test bed to compare the 2D-S with 2D cloud (2D-C) and 260X probes. The 2D-S sees thousands of cloud drops 150 ?m when the 2D-C and 260X probes see few or none. The data suggest that particle images and size distributions ranging from 25 to ?150 ?m and collected at airspeeds >100 m s?1 by the 2D-C and 260X probes are probably (erroneously) generated from out-of-focus particles. Development of the 2D-S is in its infancy, and much work needs to be done to quantify its performance and generate software to analyze data.
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contributor author | Lawson, R. Paul | |
contributor author | O’Connor, Darren | |
contributor author | Zmarzly, Patrick | |
contributor author | Weaver, Kim | |
contributor author | Baker, Brad | |
contributor author | Mo, Qixu | |
contributor author | Jonsson, Haflidi | |
date accessioned | 2017-06-09T17:23:18Z | |
date available | 2017-06-09T17:23:18Z | |
date copyright | 2006/11/01 | |
date issued | 2006 | |
identifier issn | 0739-0572 | |
identifier other | ams-84311.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4227633 | |
description abstract | The design, laboratory calibrations, and flight tests of a new optical imaging instrument, the two-dimensional stereo (2D-S) probe, are presented. Two orthogonal laser beams cross in the middle of the sample volume. Custom, high-speed, 128-photodiode linear arrays and electronics produce shadowgraph images with true 10-?m pixel resolution at aircraft speeds up to 250 m s?1. An overlap region is defined by the two laser beams, improving the sample volume boundaries and sizing of small (100 ?m) particles, compared to conventional optical array probes. The stereo views of particles in the overlap region can also improve determination of three-dimensional properties of some particles. Data collected by three research aircraft are examined and discussed. The 2D-S sees fine details of ice crystals and small water drops coexisting in mixed-phase cloud. Measurements in warm cumuli collected by the NCAR C-130 during the Rain in Cumulus over the Ocean (RICO) project provide a test bed to compare the 2D-S with 2D cloud (2D-C) and 260X probes. The 2D-S sees thousands of cloud drops 150 ?m when the 2D-C and 260X probes see few or none. The data suggest that particle images and size distributions ranging from 25 to ?150 ?m and collected at airspeeds >100 m s?1 by the 2D-C and 260X probes are probably (erroneously) generated from out-of-focus particles. Development of the 2D-S is in its infancy, and much work needs to be done to quantify its performance and generate software to analyze data. | |
publisher | American Meteorological Society | |
title | The 2D-S (Stereo) Probe: Design and Preliminary Tests of a New Airborne, High-Speed, High-Resolution Particle Imaging Probe | |
type | Journal Paper | |
journal volume | 23 | |
journal issue | 11 | |
journal title | Journal of Atmospheric and Oceanic Technology | |
identifier doi | 10.1175/JTECH1927.1 | |
journal fristpage | 1462 | |
journal lastpage | 1477 | |
tree | Journal of Atmospheric and Oceanic Technology:;2006:;volume( 023 ):;issue: 011 | |
contenttype | Fulltext |