Piv (Particle Image Velocimetry) - IAI SP-20000M-CXP2 User Manual

7.7

PIV (Particle Image Velocimetry)

The Particle Image Velocimetry mode can be used in applications where 2 images need to be taken with
a very short time interval. It can only be used with strobe flash as illumination. The first accumulation
time is 10 sec to 33 msec. Then, the second exposure will be taken. The first strobe is activated during
the first exposure duration and the second strobe is pulsed while the first frame is being read out. In this
way, two strobe flashes generate two video outputs.
Basic settings to use this mode
Trigger Mode = ON
Exposure Mode = Timed
Trigger Option = PIV
Table – 50 Typical Minimum trigger interval (Pixel Format: 8-bit)
Trigger Mode
PIV mode
(Note1)
Note 1． This is Trigegr Overlap=OFF. Trigegr Overlap mode=Readout is not available
Note 2． SP-20000M-CXP2 only
Frame Start Trigger IN
Frame Trigger Wait
Frame Active
Exposure Timing
Exposure Active
FVAL
DVAL
Note 1. The exposure time for the first frame (te1) can be set by [Exposure Time].
Note 2. The second exposure time (te2) varies by ROI setting and Binning setting, but is not
affected by [Exposure Time] setting.
SP-20000M-CXP2 / SP-20000C-CXP2
Readout Mode
Full
AOI Center 2/3
AOI Center 1/2
AOI Center 1/4
AOI Center 1/8
V Binning ON (Full)
(Note2)
１ｓｔ Ｆｒａｍｅ
Readout Delay
td te1
ift
Fig. 32
Time (Min. Trigger Period)
CXP6_X1,
CXP6_X2
CXP3_X2
≧63.625 ms ≧126.489 ms
≧42.677 ms ≧84.592 ms
≧32.203 ms ≧63.644 ms
≧16.492 ms ≧32.221 ms
≧8.636 ms ≧16.510 ms
≧63.635 ms ≧126.504 ms
Trigger Period (Min.)
2nd Frame
tframe1
Readout Delay
te2
FVAL Non-Active
PIV mode timing
- 57 -
CXP3_X1
≧252.834 ms
≧169.041 ms
≧127.144 ms
≧64.299 ms
≧32.877 ms
≧252.868 ms
a
b
tframe2