BAI
Balloon-borne Aerosol Impactor

The Balloon-borne Aerosol Impactor (BAI) is an aerosol collector designed for zero-pressure balloon flights. It includes a four-stage impactor, a vacuum pump, a volumetric flow controller, and a Raspberry Pi-based controller connected to a meteorological sonde. The impactor operates on the principle of inertia and determines the size cutoff at each stage based on flow and instrument dimensions. Aerosols are sampled at four stages according to their particle radius: 2, 0.5, 0.15, and 0.05 µm, with a flow rate of 7 liters per minute.