JAI TM-2030GE, User Manual

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Operation 21
RM/TM-2030GE Series
3.5.5 Particle Imaging Velocimetry Fixed Exposure Mode
In Particle Imaging Velocimetry (PIV) Fixed Exposure Mode, when an external trigger is applied, the first time
exposure starts the same as in PWC mode. It lasts a very short period (8 μ s). The second time exposure starts
during the transferring time of the first image. The second time exposure continues until the first image
transfers completely. The second image is transferred after the second exposure. There is a short period
(500ns) between the first exposure and the second exposure. In order to keep two exposure periods constant,
the LDV is reset before the first image is transferred out.
The maximum trigger frequency in this mode is equal to 1/ (transfer time of two 4 μ s). The minimum
active period of the external trigger is 5 μ s
Figure 13. PIV Exposure Timing Table
3.5.6 PWC PIV Mode
The PWC PIV Mode is based on PIV Fixed Exposure. In this mode, the first time exposure is controlled by the
pulse width of the external trigger, which is similar to PWC mode. The real exposure time of the first image is
equal to the pulse width of the external trigger.
The maximum trigger frequency in this mode is equal to 1/ (transfer time of two exposure time of the
first image).
The minimum active period of the external trigger is 10 pixel clocks (250ns)
Figure 14. PWC PIV Timing Table.