Photon Focus MV2-D1280-640, User Manual, Page: 37 / 85

Exposure time Frame rate
10
µ
s 486 / 488 fps
100
µ
s 466 / 488 fps
500
µ
s 392 / 488 fps
1 ms 328 / 488 fps
2 ms 247 / 488 fps
5 ms 142 / 200 fps
10 ms 83 / 100 fps
12 ms 71 / 83 fps
Table 4.3: Frame rate of different exposure times, [sequential readout mode / simultaneous readout mode],
resolution 1280x1024 pixel (correction off, CFR off ).
Calculation of the maximum frame rate
The frame rate mainly depends of the exposure time and readout time. The frame rate is the
inverse of the frame time. In the following formulas the minimum frame time is calculated.
When using CFR mode the frame time can get extended.
fps
=
1
t
frame
Calculation of the frame time (sequential mode)
t
frame
≥
t
exp
+ t
ro
+ t
row
+ t
proc
Calculation of the frame time (simultaneous mode)
t
frame
≥ max(t
exp
+ t
row
, t
ro
) + t
CLK
* 2 * LP
t
row
=
t
CLK
* (128 + LP)
t
ro
=
P
y
* t
row
t
proc
=
18 * t
CLK
(free running); 22 * t
CLK
(exsync or external trigger)
t
frame
frame time
t
exp
exposure time
t
row
readout time of one row
t
ro
readout time
t
proc
processing time in sequential readout
t
CLK
sensor clock cycle length
P
Y
number of pixels in y-direction
LP line pause, constant LP = 4
4.5 Reduction of Image Size 35