User manual

Rolera Thunder User Manual 13
In Overlap mode when exposure time < readout time, the total time (T
N
) taken to capture N
frames is given by:
T
N
= (t
R
× N) + t
exp
Where
T
N
= Total time taken to capture a sequence of N frames
t
R
= readout time for one frame
N = total number of frames in a sequence
t
exp
= exposure time
Figure 11. Timing Diagram for Overlap Mode when
Exposure Time < Readout Time
Example 2: Overlap Mode when Exposure Time > Readout Time
If the exposure time is set to 50 ms with the readout time remaining at 34.8 ms, the time taken
to acquire 3 frames will be 184.8 ms (3 × 50 ms + 34.8 ms), which is equivalent to a frame rate of
16.2 fps.
In Overlap mode when exposure time > readout time, the total time (T
N
) taken to capture N
frames is expressed as:
T
N
= (t
exp
× N) + t
R
Where
T
N
= Total time taken to capture a sequence of N frames
t
exp
= exposure time
N = total number of frames in a sequence
t
R
= readout time for one frame
From the timing diagram, you can see that because the exposure time is greater than the
readout time, all frames are precisely exposed for the duration entered into the software and
have similar intensities.
Figure 12. Timing Diagram for Overlap Mode when
Exposure Time > Readout Time
Readout
Effective
Exposure Time
Exp #1
10 ms
Exp #2
34.8 ms
Exp #3
34.8 ms
Readout #1
34.8 ms
Readout #2
34.8 ms
Readout #3
34.8 ms
Total time for 3 frames is approximately 114.4 ms
Clears
Readout
Effective
Exposure Time
Exp #1
50 ms
Exp #2
50 ms
Exp #3
50 ms
Readout #1
34.8 ms
Readout #2
34.8 ms
Readout #3
34.8 ms
Total time for 3 frames is approximately 184.8 ms
Clears