Measurements Provided: Holograms of hydrometeors
Manufacturer or Builder of the Instrument: NCAR
When Acquired:
Operational Status (select from or add to list):
- requestable, ready for deployment
- requestable, but has problems, needs work before deployment
not on request list but could be available if requested
still under development and not requestable
obsolete, should be or is retired
General Description (with photos, diagrams, etc.):
- The HOLODEC-II is a second-generation version of a holographic detecter designed to determine the size, two-dimensional shape, and three-dimensional position of hydrometeors via digital in-line holography. Advantages vs other hydrometeor detectors are that the sample volume is not size dependent, relative positions of hydrometeors in the sample volume can be determined in three dimensions, and effects produced by shattering from the aperture edges can be identified and eliminated. Automated analysis programs have been develop to process the holograms collected and produce size distributions. HOLODEC-II has sufficient resolution to determine the sizes and locations of cloud droplets as well as ice crystals.
- The following are photographs of the instrument as installed on the GV (left) and C-130 (right):
Measurement Characteristics:
Overall estimate of uncertainty: In progress
Response time: Single particle capable
Precision: on the order of a micron
Other measurement characteristics (comments on signal/noise, bias limits, etc):
Calibration Methods: In progress
History of Significant Changes to the Instrument: Completed 2011
Description of Software, Data Handling, and Data Flow: Rack PC data collection software, quick look software based on MatLAB, more elaborate particle construction software under development
Software Components (data acquisition, display, processing, and analysis): See above
Data Processing Chain (from flight to archival):
QA Procedures and Needs: }}}
Safety Issues: Sharp prob tips
Examples of Measurements: