A Single-Beam Velocimeter Based on Rainbow-Interferometry
A velocimeter which consists of one laser beam and one photomultiplier is proposed. The instrument is based on the primary rainbow created by a transparent particle illuminated by a laser beam; this rainbow moves in front of a photomultiplier when the particle traverses the laser beam. Frequency analysis of the recorded signal leads to the droplet size and to one component of the velocity vector. Validation experiments have been carried out using a spherical glass bead. To improve the measurements with water droplets, a nonsphericity detection is proposed by adding one photomultiplier.
KeywordsDroplet velocity Droplet Size Rainbow Technique
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