Turbulent flows are three-dimensional by nature. A major challenge in turbulence research is the simultaneous measurement of all three velocity components in three-dimensional space. Recently, Rainbow Volumic Velocimetry (RVV) has emerged as a promising technique to visualize and measure three-dimensional flow fields. The RVV technique projects a multicolor light beam in the measurement region. Currently, the technique utilizes beam color variations in one plane i.e. perpendicular to the camera field of view but is restricted to small measurement volumes.

In this paper, a new approach of light beam projection using a multicolor grid is proposed that allows beam color variations in multiple planes relative to the camera field of view. This enables the extension of the light beam width through multiple color combinations. Details of the technique and its implementation are presented along with the preliminary results that demonstrates the viability of this technique.

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