ScanImage 2016 can use photon counting modules instead of standard PMTs. A photon counting head / module consits of a PMT and a subsequent photon counting circuit. This circuit generates a TTL pulse of a defined duration when a photon is detected. ScanImage samples this TTL pulse using the auxiliary digital inputs PFI0-3 of the NI 573x digitizer modules.
To configure photon counting for ResScan, add the following entries to the Machine Data File:
The setting photonCountingDebounce can be used to clean up a noisy signal. The delay introduced by photonCountingDebounce can be eliminated by adjusting the value for the scan phase in Configuration Controls.