Dalsa Genie Nano-CXP, Руководство пользователя

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40 • Feature Descriptions Genie Nano- CXP Series™
• The exposure duration can be programmable (Exposure Mode = Timed, free run or external
trigger ) or controlled by the external input trigger pulse width (Exposure Mode = TriggerWidth).
Note that different Nano models will support different combinations of exposure controls.
Synchronous Exposure Alignment
Exposure is synchronous to the internal timing of the sensor. The readout is concurrent to the
exposure for the fastest possible frame rate.
When a valid trigger is received and the Exposure Time is shorter than the readout period, the
Exposure
Start event is latched in the previous frame’s readout. That is; the Exposure Start Event
is delayed and is initiated when the actual exposure starts such that the exposure ends and
readout begins as soon as the previous readout has completed.
• The programmable exposure duration is in 1µs steps.
• Exposure duration is from a camera sensor specific minimum (in µs) up to 10 sec.
• Any trigger received before the start of frame readout is ignored and generates an invalid frame
trigger event.
Reset Exposure Alignment
Sensor timing is reset to initiate exposure when a valid trigger is received. Readout is sequential to
exposure, reducing the maximum achievable frame rates. That is, a trigger received during
exposure or readout is ignored since data would be lost by performing a reset.
Sensor Exposure Timing: OnSemi Python Models
Nano cameras with OnSemi sensors have general timing characteristics as described below.
Trigger Characteristics: Start of Exposure
External
Trigger Input
Input propagation Delay (see Input Signals Electrical Specifications)
Internal Trigger Control
<< Exposure Active >>
Start of Exposure Details
for Nano Models using OnSemi Python
rising edge active
Internal Delay (exposureAlignment = Reset or Synchronous With No Overlap)
Internal Delay (exposureAlignment = Synchronous With Overlap)
Additional triggered exposure mode features and timing specific to OnSemi sensors are described
in the
I/O Controls Category .