抄録
The Laser Speckle Velocimetry (LSV) is one of the most useful method of quantitative visualization of flow fields. However, some techniques in this method are necessary to improve for a wide use. One of these is illumination technique.
We propose a new illumination technique of a observation plane by sweeping of two laser beams scanned by the same face of a polygon mirror scanner. With this method seeding particles in the plane are illuminated by each sweeping beam with short time difference controlled by incident cross angle of two beams to the scanner and also angular velocity of the scanner.
In this report, the characteristics of the dual-beam-sweep laser speckle velocimetry and application results are discussed.
