A swept-beam, two-color particle-imaging velocimetry (PIV) technique has been developed which utilizes a single argon-ion laser for illuminating the seed particles in a flowfield. In previous two-color PIV techniques two pulsed lasers were employed as the different-color light sources. In the present experiment the particles in a two-dimensional shear-layer flow were illuminated using arotating mirror to sweep the 488.0-nm (blue) and 514·5-nm (green) lines of the argon-ion laser through a test section. The blue- and greenparticle positions were recorded on color film with a 35-mm camera. The unique color coding eliminates the directional ambiguities associated with single-color techniques because the order in which the particle images are produced is known. Analysis of these two-color PIV images involved digitizing the exposed film to obtain the blue and green-particle image fields and processing the digitized images with velocity-displacement software. Argon-ion lasers are available in many laboratories; with the addition of a rotating mirror and a few optical components, it is possible to conduct flow-visualization experiments and make quantitative velocity measurements in many flow facilities.
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- d :
length of displacement vector
- d m :
distance between rotating mirror and concave mirror
- n f :
number of facets on rotating mirror
- R :
- v :
velocity in x, y plane
- v s :
sweep velocity of laser beams, assumed to be in y direction from top to bottom of field of view
- v x, v y, v z :
x, y, and z components of velocity
- x 1, y 1 :
color-1 particle coordinates
- x 2, y 2 :
color-2 particle coordinates
- y max :
y dimension of field of view, assumed to be the long dimension
- Δs :
spatial separation of beams as they approach rotating mirror
- Δt :
time separation of laser sheets or of swept beams passing fixed point
- Δt b :
time between successive sweeps through test section by same beam
- Δt s :
time required for both beams to sweep through test section
- Δθ :
angular separation of beams reflecting from rotating mirror
- μ :
- v :
angular velocity of rotating mirror in cycles per second
- ϱ :
- τ :
seed-particle response time
- σ v, σ d, σ t :
standard deviation of velocity, displacement, and time
- ω :
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This work was supported, in part, by the Aero Propulsion and Power Directorate of Wright Laboratory under Contract No. F33615-90-C-2033.
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Post, M.E., Trump, D.D., Goss, L.P. et al. Two-color particle-imaging velocimetry using a single argon-ion laser. Experiments in Fluids 16, 263–272 (1994). https://doi.org/10.1007/BF00206546
- Pulse Laser
- Test Section
- Velocity Measurement
- Particle Image