AD-081CL
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7.1.10 PIV (Particle Image Velocimetry) mode
The AD-081CL is equipped with PIV (Particle Image Velocimetry) mode. This mode provides
three (3) consecutive images by one trigger pulse. When the trigger is input, the first exposure
on BW1 can be captured, followed quickly by an exposure on BW2. After the exposure on BW2 is
completed, a second exposure on BW1 is made. Each exposure is executed by a strobe flash in a
very short interval period. The exposure time is preset at 4 µs, 6µs or 8µs by the Trigger mode
command, TR1=4(PIV1), 5(PIV2) or 6(PIV3) respectively.
Trigger
Input
BW 1
EEN
BW １
Video Output
Strobe Flash
BW ２
EEN
BW ２
Video Output
Exposure 1 image
Exposure 2 Image
Exposure 3 image
Exposure 1
Exposure 2
Exposure 3
1 Frame
Fig.14 PIV conceptual drawing
7.1.11 High Frame Rate function (double speed readout)
A high frame rate (double speed) can be achieved by shifting the exposure timing of BW1 and
BW2 by 1/2 frame duration. As the AD-081CL operates at the rate of 30 fps in continuous mode,
this will produce a rate of 60 fps in high frame rate mode (double speed mode). The shutter
speed must be less than 1/60s (396L). This mode can be set by process mode command HF=1 in
the case of normal mode.
In the case of trigger mode, after setting Output Mode IS=1 (Separate), high frame rate is
achieved by providing a trigger pulse to each camera at 1/2 frame duration.
BW 1 Exposure
BW 1 Image
Output
BW 2 Exposure
BW 2 Image
Output
1/60s
1/60s
1/60s
1/60s
1/60s
1/30s
1/30s
1/30s
1/30s
Fig.15 High Frame rate conceptual drawing
