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8
Radiometric measurement
Figure 8.4 The IWR frame generation process.
The integration period cannot end before the previous frame data is read. The integration
period cannot begin until after the previous frame's data read starts. Therefore, the calcu-
lation used to compute the maximum IWR frame rate depends on the integration and da-
ta read period. These calculations are shown in Table 8.1.
Table 8.1 IWR maximum frame rate calculations
Data width
Dead time
Integration time
Frame rate
Table 8.2 shows the IWR calculations for a typical frame setting of 640 × 512 with an inte-
gration period of 2.0 ms.
Table 8.2 IWR maximum frame rate calculations, 640 × 512, 2.0 ms integration time
Data width
Dead time
Integration time
Frame rate
8.5.4 Procedure
Note The IWR mode is not available in all camera models.
Follow the procedure below to select the camera integration mode (ITR or IWR):
1. Connect the camera to ResearchIR Max
2. In the camera tab, under Advanced Camera Control, select the integration mode.
8.6 Dynamic range extension—superframing
The main purpose of superframing is to capture a large dynamic range event with various
integration times. Consider a rocket launch as an example. During the launch, a short in-
tegration time would be needed to monitor the plume of the rocket. However, such a
short integration time would not yield adequate images across the the rocket body. If the
integration time was increased to yield adequate images across the rocket body and its
#T810207; r. AA/43061/43086; en-US
[4 + number of columns + number of columns ×
number of rows)]/50 M
249.28 µs
User defined; [320 ns ≤ integration time ≤ 11
minutes]
Integration time < data width + dead time : 1/[ data
width + dead time]
Integration time > data width + dead time : 1/[ Inte-
gration time + dead time]
[4 + 640 + 640 × 512]/50 M = 0.00656648
249.28 µs
0.002
Integration time < data width + dead time:
1/[0. 00656648 + 0. 00024928] = 1/[0.00681576]
= 146.72
39
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