Description: Atmospheric clouds have strong impact on the global radiative budget. Cloud's radiative properties are strongly affected by droplet size distribution and number concentration. This SBIR project will develop an innovative, compact and inexpensive droplet measurement system (DMS), which will provide in situ measurement of droplet size distribution function and droplet number concentration in clouds. The DMS will be designed to meet the demanding requirements for deployment on small unmanned aircraft systems (UAS). Phase I will demonstrate the feasibility of the proposed method and yield benchtop technology ready for transition to a UAS-compatible prototype in Phase II.

Benefits: The proposed DMS technology will meet the NASA's need to add in situ cloud measurement capabilities to small research UAS's. Deployment of the DMS implemented as a compact and lightweight economic package on small UAS's will result in reduced costs and improved coverage of the NASA's UAS-based atmospheric measurement campaigns. Precise and extensive cloud characterization data will lead to better understanding of the contribution of atmospheric clouds to Earth's radiative budget and climate change. Other potential applications include characterization of atmospheric aerosols, particulate matter in volcanic ash plumes and fuel sprays.

The proposed DMS will be of interest to research institutions and government agencies involved in atmospheric measurements. Flexibility and low cost of the proposed technology will make it compatible with a variety of airborne- and ground-based platforms and suitable for other applications such as characterization of atmospheric aerosols, volcanic ash plumes and industrial/agricultural sprays.