Real-time, Doppler global velocimetry

Development and Testing of the Virginia Tech Doppler Global Velocimeter

“…The original DGV system tested by Komine [11] was entirely analog. The filtered and reference views from each analog video camera pair were divided at a rate of 30 frames-per-second by a divider circuit.…”

“…Particle, or Mie, scattering techniques were first introduced by Komine et al [11]. Their system relied on imaging a laser sheet in a particle seeded flow with standard video cameras.…”

“…The early systems by Komine [11] and Meyers [13] used two cameras for each viewing angle, giving a total of six cameras for a three-component velocity system. A schematic view of the two camera system is shown in Figure 3.4.…”

The Analysis of Flow Stability in Pipe by Experiment

“…Image point is divided into three points and presents the distribution of right angled isosceles triangle. [2,10,11] The optical axis of the receiving unit must be located as far as possible on the same axis of the incident light unit to ensure that the receiver is at the same height with the incident light unit.…”

“…[2,10,11] Optical unit which has semiconductor laser is placed on the main rail.On the guide rail, the position can be moved by the sliding of rocker arm and different positions are measured.…”