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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 49
Triggered exposure control is set in pixel clock increments. A special trigger clock in the RMV,
equal to the pixel clock divided by 4/16/64/1024 is used to calculate the triggered exposure time. The
triggered exposure is set with a register called the Transfer Pulse Delay (TPD).
TPD is the time from
the trigger to the transfer of the photodiode image data into the CCD storage area for readout.
In
the RMV trigger mode the camera waits for a trigger while simultaneously flushing the internal CCD.
When a trigger is detected the TPD counter starts from zero. The TPD counter is used to time the elec-
tronic erasure pulse that is used to clear the photo diodes and begin exposing a new image. This elec-
tronic erasure pulse requires 6 TPD time periods. (Thus the minimum TPD is 6). The TPD counter is
then incremented using the special trigger clock (1/64th the pixel clock) until the TPD counter is equal to
the TPD register. When the TPD counter equals the TPD register the image transfer and readout cycles
are started.
Mode interactions:
FRM + ASYNC RESET = FRS (Free Run Synchronized mode)
TOE modifies TPE and TME modes
TME exposure time = TPD + Trigger Pulse Width
Time
CCD Flush
Erasure
Exposure
Image Readout
CCD Flush
Trigger
rising edge
TPD
Triggered exposure example: TPE
TPD determines the exposure
Time
CCD Flush
Erasure
Exposure
Image Readout
CCD Flush
Trigger
TPD
Triggered exposure example: TME
Trigger pulse width plus TPD determines the exposure