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Appendix E Virtual Chip Mode 101
➧ If frame acquisition appears to be slow in Focus mode, check the Frames/Interrupt
value on the Environment dialog box and reset the value to 1 if it is greater than 1.
➧ When processing large stacks of data, you may want to use a third-party scientific
image processing package.
➧ Use the 15' HV cable when performing non-gated (CW) experiments and the shorter
version of that cable when performing gated experiments.
➧ When running at high FPS, you may see tailing from the phosphor in subsequent
image frames. This is due to the long-lived emission from the intensifier phosphor.
For the standard phosphor, this signal has a decay rate (exponential 100%-1%) of
approximately 3 ms. If the phosphor signal is an issue, you can decrease the FPS or
correct the data by subtracting the residual signal from subsequent images
(essentially a negative exponential decay). Contact Princeton Instruments for
information about intensifiers with high speed phosphors.
➧ Due to CCD design, you may see some edge artifacts when acquiring data from the
entire virtual chip. Crop these artifacts by defining an ROI that is slightly smaller
than the virtual chip dimensions.