ALLIED Vision Technologies Bonito CL-400 200 fps User Manual
Page 55
Parameters and commands
Bonito Technical Manual V2.3.0
55
The rising edge at synchronization output signalizes externally that the expo-
sure of the first PIV frame has ended. This requires setting
J=1, and may be
used to trigger the second flash pulse. The recommended guard interval t
G2
will
be kept automatically.
To move the second flash pulse closer to the first end of charge transfer, use an
external timing device that is triggered by an external camera trigger or the
previous falling edge of the synchronization output.
Depending on the synchronization output setting (parameter
J), the corre-
sponding pin at the camera's control connector may directly output the first
charge transfer pulse for each PIV pair. By default, the falling edge of the syn-
chronization signal always coincides with the beginning of the charge transfer
of the first image, plus some delay (t
S1
).
When the first charge transfer ends, the synchronization signal rises back to
high level, again with a delay (t
S2
).
The synchronization signal is accessible through pin 6 of the 15-pin D-sub con-
nector. For more information about the synchronization signal, see section
Timing of the flash
pulses
To ensure high quality image results, the flash pulses should contribute pre-
dominantly to the exposure of the images, also the ambient light should be
minimized as much as possible.
The first strobe pulse should be placed shortly before the end of internal charge
transfer of the first PIV frame.
The second strobe pulse should be placed after the end of internal charge trans-
fer of the first PIV image.
To minimize the crosstalk between the first and the second image, do not shift
the first strobe pulse position too close to the end of charge transfer. The guard
interval time t
G1
(see
Table 17: PIV mode timing parameters not depending on
the setting of other parameters.
on page 57) is a recommended minimum.
Depending on the application it may be adjusted individually.
For the same reason, the recommended minimum guard interval time t
G2
(see
Table 17: PIV mode timing parameters not depending on the setting of other
parameters.
on page 57) for the second strobe pulse should be kept, but
depending on the application it may be adjusted individually.
Synchronization of the flash pulses can be realized e.g. by an external timing
generator that generates a pair of strobe pulses. Alternatively, the synchroni-
zation can be implemented by using the corresponding output signal of the
camera. For information on synchronization output see
J in chapter
Examples
M=5
(0x5 = 0b101), sets the bit field to „- - 0 0 - 1 0 1“.
•
Activates Image on Demand mode (IOD) (weight =
1)
•
Activates PIV mode (weight =
4)