Electric fields are measured by 4 shutter type mills mounted normal to the aircraft skin, up, down, left, and right. The horizontal mills are symmetrically mounted about midway between the door and the trailing edge of the wings. The vertical mills are mounted near the trailing edge of the wings, but their vertical location differs by 0.6 m and the top mill is mounted on a 0.3 m aluminum pylon. Relative enhancements were measured by charging the aircraft in cloud-free flight.
Cloud Physics Parameters | Instrumentation | Range |
Small cloud droplet spectrum | FSSP forward scattering probe | 0.005-0.047 mm |
Cloud droplet spectrum | PMS 2-D Gray and/or mono probes | 0.03-1.92 mm |
Hydrometeor size spectrum | PMS 2-D Gray and/or mono probes | 0.15-9.6 mm |
Cloud liquid water | Johnson-Williams hot wire | <0.04 mm |
Total liquid water | PMS King probe | <0.1 mm |
Cloud particle replication | Formvar Replicator-DRI | 0.05-1.3 mm |
Cloud particle charge | Particle charge probe-DRI | >2 pC |
Two components of electric field | Field Mills-DRI | 2-120 kVA/m |
Icing rate | Rosemount |