Chemical Meters/Analyzers
type: Concept

PMS 2D-S PROBE
type: Concept
in scheme: instruments
definition: [Source: LPVEx Two-Dimensional Stereo Probe and Cloud Particle Imager home page, http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/lpvex/gpmcilpvex/gpmcilpvex_dataset.html ] The 2D stereo probe (2D-S) utilizes two laser beams that cross at right angles in the middle of the sample volume. The overlap region where the two laser beams intersect defines an area where two orthogonal views of particles are obtained, which improves sample volume boundaries and sizing of small (less than 100 μm) particles as compared to conventional optical array probes. The use of two high-speed, 128-photodiode linear arrays allows the 2D-S probe to produce shadowgraph particle images with 10-μm pixel resolution at aircraft speeds up to 250 m s−1. The stereo views of particles in the overlap region can also improve determination of the three-dimensional shape of a particle. Features of this probe are: - Has two 128-photodiode linear arrays working independently as high-speed and high-resolution optical imaging probes. - Captures two-dimensional images of particles passing through the 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 older probes. - 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. Group: Instrument_Details Entry_ID: PMS 2D-S PROBE Group: Instrument_Identification Instrument_Category: In Situ/Laboratory Instruments Instrument_Class: Chemical Meters/Analyzers Short_Name: PMS 2D-S PROBE Long_Name: Particle Measuring Systems 2D-S Probe End_Group Group: Associated_Platforms Short_Name: BEECHCRAFT KING AIR End_Group Group: Spectral_Frequency_Information Spectral_Frequency_Resolution: 10 microns End_Group Online_Resource: http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/lpvex/gpmcilpvex/gpmcilpvex_dataset.html Creation_Date: 2011-03-0…