Comparison of Icing Cloud Instruments for 1982-1983 Icing Season Flight Program.
Abstract
A number of modern and old-style liquid water content (LWC) and droplet sizing instruments were mounted on a DeHavilland DHC-6 Twin Otter and operated in natural icing clouds in order to determine their comparative operating characteristics and limitations over a broad range of conditions. The evaluation period occurred during the 1982-1983 icing season from January to March 1983. Twelve icing research flights were conducted. Time histories of all instrument outputs were plotted to assess instrument repeatability and reliability. Scatter plots were generated for comparison of the instruments. The measured from four instruments differed by as much as 20 percent. The measured droplet size from two instruments differed by an average of 3 microns. The overall effort demonstrated the need for additional comparative data, and for some means of calibrating these instruments to known standards. The importance of pre-flight instrument checks is discussed and a portable spray rig for checkout of hot-wire LWC instruments and laser spectrometers is described. Originator supplied keywords include: MVD(Median Volume Diameter).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1983
- Accession Number
- ADA147882
Entities
People
- G. P. Richter
- R. F. Ide
Organizations
- National Aeronautics and Space Administration