Baumer TXG - Free Running Mode; Fixed-Frame-Rate Mode

24
The cameras can be operated non-overlapped
*)
or overlapped. Depending on the mode
used, and the combination of exposure and readout time:
Non-overlappedOperation OverlappedOperation
Here the time intervals are long enough
to process exposure and readout succes-
sively.
In this operation the exposure of a frame
(n+1) takes place during the readout of
frame (n).
Exposure
Readout
Exposure
Readout
2.4.1 FreeRunningMode
In the "Free Running" mode the camera records images permanently and sends them to
the PC. In order to achieve an optimal (with regard to the adjusted exposure time t
exposure
and image format) the camera is operated overlapped.
In case of exposure times equal to / less than the readout time (t
exposure
≤ t
readout
), the maxi-
mum frame rate is provided for the image format used. For longer exposure times the
frame rate of the camera is reduced.
Exposure
Readout
Flash
t
exposure(n)
t
flash(n)
t
flashdelay
t
flash(n+1)
t
readout(n+1)
t
readout(n)
t
exposure(n+1)
t
ash
= t
exposure
Fixed-Frame-RateMode2.4.2
With this feature Baumer introduces a clever technique to the TXG camera series, that
enables the user to predene a desired frame rate in continous mode.
For the employment of this mode the cameras are equipped with an internal clock genera-
tor that creates trigger pulses.
Notice
From a certain frame rate, skipping internal triggers is unavoidable. In general, this de-
pends on the combination of adjusted frame rate, exposure and readout times.
*) Non-overlapped means the same as sequential.
Imageparameters:
Offset
Gain
Mode
Partial Scan
Timings:
A - exposure time
frame (n) effective
B - image parameters
frame (n) effective
C - exposure time
frame (n+1) effective
D - image parameters
frame (n+1) effective