Teledyne ProEM Series, System Manual

Page: 109 / 162

Chapter 6 Advanced Topics 109
Figure 6-20: Functional Block Diagram: CCD Array
The following example compares the time savings achieved by using Custom Chip
{Custom Sensor} vs. ROI to read out a 128 x 128 region of a 512 x 512 array.
Using the ROI method to read out the 128 x 128 pixels would take 8.2 ms, or a frame
rate of 122 fps (1/0.0082). Using the Custom Chip {Custom Sensor} feature, the readout
time for the same region would drop to 3.1 ms (equivalent to a frame rate of 323 fps).
See
Figure 6-21 for a graphic comparison of the ProEM:512B camera's expected frame
rates using standard ROI readout and custom chip readout.
Figure 6-21: Comparison of Standard ROI and Custom Chip Readout Rates
External (custom)
mask for “Custom
chip” readout
Frame-transfer
Area
Active Area
441
1-
0
12
6
_
0
0
6
5
4
4
11
-01
26
_
006
6