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This is a Phase 2 proposal to develop an instrument to simultaneously measure particle size, velocity, and concentration in applications characterized by a large size range and high particle concentration. The instrument will be based on the Pulse Displacement Technique whose feasibility was demonstrated during Phase 1. Experiments performed during Phase 1 demonstrated a high accuracy in measuring spherical particles and the ability to measure nonspherical particles undergoing oscillation. The technique bases its measurement on accurate time-domain algorithms that are immune to fluctuations in laser intensity. The Phase 2 work will consist of developing a system prototype including all the hardware and software for real-time measurement of sprays, system testing with known-size particles, and system testing with realistic sprays. Phase 1 measurements with calibrated glass beads and calibrated liquid sprays showed a remarkable accuracy that placed the measurement within the particle manufacturer's tolerances. Based on the results of Phase 1 we anticipate that the system prototype will be able to measure the size of 10 ¿m to 4 mm and a downpour of 200 cm/hr as stated in the solicitation.