The Model 9306 Six-Jet Atomizer is used to generate a polydisperse aerosol in high concentrations for use as seed particles for PIV and LDV measurements. The system has a built-in pressure regulator and pressure gauge, as well as a self-contained dilution system. External controls allow one through six particle-generating atomizer jets to be selected, allowing both the particle number concentration and the total particle output to be adjusted. The system can be used to generate particles from virtually any liquid, and can even produce solid particles from solutions or suspensions. Precise control of dilution air flow rate allows further control over the output concentration and helps dry the solid particles generated from a solution.