7.4 Laser Tomoscopy or Laser Sheet Visualisation
171
Fig. 7.7 Vortex breakdown over the delta wing of a combat aircraft (© ONERA)
Fig. 7.8 Visualisation by the
method of air bubbles in a
water tunnel
7.4 Laser Tomoscopy or Laser Sheet Visualisation
The principle of this method is to observe the light scattered by particles injected into
the flow which is illuminated by a sufficiently strong laser. Water droplets or smoke
particles are produced by atomisation of appropriate oil. In most applications, the
light sheet is produced by a laser beam passing through a glass rod (cylindrical lens)
or a combination of lenses (see Fig. 7.10). Very meaningful images can be obtained
showing vortices, boundary layers or shock waves.
171
Fig. 7.7 Vortex breakdown over the delta wing of a combat aircraft (© ONERA)
Fig. 7.8 Visualisation by the
method of air bubbles in a
water tunnel
7.4 Laser Tomoscopy or Laser Sheet Visualisation
The principle of this method is to observe the light scattered by particles injected into
the flow which is illuminated by a sufficiently strong laser. Water droplets or smoke
particles are produced by atomisation of appropriate oil. In most applications, the
light sheet is produced by a laser beam passing through a glass rod (cylindrical lens)
or a combination of lenses (see Fig. 7.10). Very meaningful images can be obtained
showing vortices, boundary layers or shock waves.