SGP/VCEIL/C1 - Contaminated window

Alarm shown: Light Path Obstruction and Window Contamination. Window condition was 2%. 
Observed massive amounts of bird droppings on window. Cleaned window and shortly after 
window condition had risen to 94% and alarm was cleared.

• Vertical visibility(vertical_visibility)
• Lowest cloud base height detected(first_cbh)
• Second lowest cloud base height(second_cbh)
• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• Sum of detected and normalized backscatter(sum_backscatter)
• Altitude of highest signal(alt_highest_signal)
• Detection status.(detection_status)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Third cloud base height(third_cbh)