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8
Radiometric measurement
plume, the plume would saturate the detector. Superframing cycles through up to eight
different integration periods. Below is a timing graph explaining the link between the re-
corded frame and the integration time in superframing mode.
Refer to section 6.4.5 Temperature range adjustment, page 23 to set up superframing.
8.7 Camera synchronization
The FLIR X6520sc can be synchronized to an external signal. The synchronization ap-
plies to the timing of an individual frame. The camera features a Sync In connector (4 in
Figure 5.3 Camera back panel description., page 11) and a Sync Out connector (5 in Fig-
ure 5.3 Camera back panel description., page 11).
The FLIR X6520sc makes use of frame synchronizations to control the generation of im-
age data. The generation of a frame consists of two phases: integration and data read-
out. Depending on the timing between these two events, you have two basic integration
modes: ITR and IWR. In ITR mode, integration and data readout occur sequentially. The
complete frame time is the combined total of the integration time plus the readout time.
In IWR mode, the integration phase of the current frame occurs during the readout phase
of the previous frame. In other words, the ITR and IWR refer to whether or not the cam-
era will overlap the data readout and integration periods. In ITR mode, the data is not
overlapped, which means lower frame rates, but this process provides a less noisy im-
age. IWR mode can achieve much faster frame rates, but with a slight increase in noise.
On frame synchronization, the camera immediately integrates, followed by data read out.
Note
• When using an external frame synchronization and preset sequencing, or superfram-
ing, the external frame synchronization should be set to comply with the ITR frame
rate limits. If the external synchronization rate is too fast, the camera will ignore syn-
chronizations that occur before the camera is ready.
• If the frame rate is too low, the image quality may deteriorate. Contact your FLIR rep-
resentative if you have questions about low frame rates for your specific camera
model.
• Synchronization is different from triggering. The latter is described in section 8.8 Trig-
ger In, page 43.
• The IWR mode is not available in all camera models.
Figure 8.5 Frame synchronization—ITR mode.
#T810207; r. AA/43061/43086; en-US
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