JAI TM/TMC-4200CL Manuale Utente
Page 41
Functions and Operations
TM/TMC-4200CL Series Progressive Scan Cameras
FIGURE 56.
Pulse Width Control Trigger
6.4.6 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 PWC mode does. It lasts a very short period (8µs). The second
time exposure starts during the transferring time of the first image accumulated in the first exposure
time. 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.
first time exposure starts the same as PWC mode does. It lasts a very short period (8µs). The second
time exposure starts during the transferring time of the first image accumulated in the first exposure
time. 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 frames + 4µs).
The minimum active period of the external trigger is 5
The minimum active period of the external trigger is 5
μs
FIGURE 57.
PIV Exposure Timing Table
External
Trigger
FDV
Vsub
TG
Exposure
Strobe
Digital
Data
Analog
Video
Data
Analog
Video
pA
pB
pC
pE
pD
P
P
pF
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