C2 Series User Manual Rev. 1.9
27
Multi-Frame Readout Mode (NDR)
With the Non-Destructive Readout (NDR) mode it is possible to readout up to 4 images at different
exposure times. It allows the combination of profile data from different integration levels and it
ensures accurate profile data even for difficult surfaces with strong changes in reflectance.
The following timing diagram shows the function of NDR with 2 frames, when subsequent sensor
images are acquired. The exposure times for NDR frame 1 and 2 are depicted with It1 and It2
respectively. Please note that the readout of the second frame R2 cannot begin unless the first frame
R1 has been readout. The same applies also between two subsequent sensor images, i.e. the first
NDR frame of sensor image 2 cannot be readout unless the last NDR frame of sensor image 1 has
been readout.
It1
R1
It2
It1
It2
R2
R1
R2
Trigger Sensor
Frame 1
Trigger Sensor
Frame 2
It1 : Exposure Time 1
It2 : Exposure Time 2
R1 : Readout Frame It1
R2 : Readout Frame It2
Frame 1 Frame 2
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