Particle Imaging Velocimetry
(PIV)
Particle Imaging Velocimetry (PIV) provides
users with the velocity profile of a whole flow field
in 2D or 3D space. Measurements from these yield
vector maps of the flow under study which aid in understanding
fluid mechanics from supersonics jets to the microchannels.
These models are similar to that of Computational Fluid
Dynamics (CFD) models.
In a typical PIV setup, the "seeded" flow
is illuminated by two laser pulses separated in time.
An advanced interline CCD or a high-speed CMOS camera
is synchronized with the lasers in order to capture
two full resolution images. By performing cross correlation
between the two images, the displacement of the seeding
particles (and the local flow) is computed.
Solutions from Princeton Instruments
Interline CCDs with alternate columns of masked
and light sensitive areas are capable of capturing
two full resolution images in quick succession. For
example, the CoolSNAP: HQ camera can capture such
a pair with 200nsec interframe time. The camera is
designed with flexible triggering for synchronization
with PIV lasers. For high sensitive PIV, the new PI-MAX3: 1024i camera provides built in gating along with dual frame capability to capture two full resolution images separated by as small as 2 usec (limited by decay time of P46 phosphor).
Recommended products
CoolSNAP:
HQ
-
High-resolution, 1392x1040
CCD
-
"Paired" mode to
capture two images 200nsec apart
-
Special "on-chip accumulation" for
increased SNR
-
Fiber optic data
interface for remote operation from up to
300 meters
PI-MAX4: 1024i
- World's first and only 32MHz/16-bit readout speed (26 fps) to keep up with high repetition rate lasers
- Gen III filmless intensifiers with >50% QE and sub-nano second gating capability
- PI dual image feature (DIF) for simultaneous PLIF/PIV measurements
MEGAPLUS - various models
- Affordable high resolution
- Low noise - high dynamic range
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