LYNX Manual RA02
The user can program the camera frame rate from 2 fps (0.5 s integration
time) up to the nominal camera speed – refer to Table 2.1, with a precision
of 1.0 fps. The user enters the desired frame rate and the camera will
calculate the corresponding integration time. Refer to the ‘sfr’ command for
setting the frame rate and the ‘gce’ command for retrieving the resultant
exposure time. Note that the user can reduce the exposure time by using the
shutter feature – refer to the ‘sst’ command.
Frame rate [fps] = 1 / integration time [sec] (4.1)
VCCD
Programmable Integration Time
Standard Frame Time
Figure 2.35 – Programmable Frame Rate
CAUTION NOTE
1. The maximum frame rate is determined by the camera mode of
operation. If the user enters a higher frame rate than the allowed one,
the image will roll. Make sure the camera always operates with the
frame rate lower than the maximum allowed.
2. Programmable Frame Rate cannot be enabled in Trigger mode.
3. Programmable Frame Rate cannot be enabled in Long Integration
mode.
2.4.3 Long
Integration
Long integration is used for extending the image exposure time beyond the
standard frame time. During normal camera operation, the minimum frame
rate determines the maximum exposure time. The desired exposure time can
be adjusted (increased) by moving the vertical transfer pulse, VCCD,
beyond the normal exposure range – Figure 2.36. This mode is very similar
to the variable frame rate mode except that in this mode, the shutter cannot
be used. The integration time can be programmed in 10 millisecond
increments from 10 ms (camera dependent) up to 10 seconds – refer to the
‘sli’ command. Enabling long integration reduces the frame rate. The
resultant frame rate can be calculated using formula 4.2. This mode is
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