Princeton Instruments PhotonMAX System, Manual, Page: 50 / 98

50 PhotonMAX System Manual Version 1.B
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.
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
Figure 35. Timing Diagram for Overlap Mode when
Exposure Time > Readout Time