User`s guide

ACQUISITION MODES
SDK SECTION 4
Page 39
Run Till Abort
Run Till Abort mode continually performs scans of the CCD at the rate set by the user, until the acquisition is
stopped by calling the
AbortAcquisition function. The minimum possible delay between each scan will be the
minimum Kinetic Cycle Time.
To set the acquisition mode to Run Till Abort call:
SetAcquistionMode(5)
SetExposureTime(0.3)
SetKineticCycleTime(0)
Here the exposure time is the time during which the CCD sensor is sensitive to light.
NOTES:
1. The total number of images acquired during the acquisition can be obtained at any time by
calling the GetTotalNumberImagesAcquired function. The data acquired during the
acquisition will be stored in the circular buffer until it is overwritten by new scans. The
capacity of the circular buffer can be obtained by calling the GetSizeOfCircularBuffer
function. To retrieve all valid data from the circular buffer before it is overwritten by new data
the GetNumberNewImages and GetImages functions should be used. Alternatively, to retrieve
only the most recent image the GetMostRecentImage function can be used. Finally, to retrieve
the oldest image the GetOldestImage function can be used.
2. Due to the time needed to shift charge into the shift register, digitize it and operate shutters,
where necessary, the exposure time cannot be set to just any value. For example, the
minimum exposure time depends on many factors including the readout mode, trigger mode
and the digitizing rate. To help the user determine what the actual exposure time will be, the
driver automatically calculates the nearest allowed value that is not less than the user’s
choice. Thus, the actual calculated exposure time used by Andor SDK may be obtained via
GetAcquisitionTimings (this function should be called after the acquisition details have been
fully defined i.e. readout mode, trigger mode etc. have been set).