Dalsa Linea2 5GigE, Руководство пользователя

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Linea2 5GigE Series Camera Operational Reference • 57
Exposure Controls Details
Exposure Control modes define the method and timing for controlling the sensor integration period.
The integration period is the amount of time the sensor is exposed to incoming light before the
video line data is transmitted to the controlling computer.
• Exposure control is defined as the start of exposure and exposure duration.
• The feature Exposure Mode selects the controlling method for the exposure.
• The start of exposure can be driven by an internal timer signal, an external trigger signal or a
software function call.
• For External Trigger signals, the relationship between an external line trigger and the exposure
period as shown in the timing diagrams below is only applicable while the external line trigger
does not exceed the maximum allowable line rate.
Exposure Delay Mode
The Exposure Delay Mode defines the start of each sensor row exposure with respect to the line
trigger.
• In Auto mode, the exposure starts are all set to 1/4 of the period apart.
• In Manual mode, the start of each exsync is defined by a delay from the trigger. The 7.8 µs
readouts cannot overlap between multiple rows.
Internal Programmable Exposure
The Linea2 5GigE in the Internal Programmable Exposure mode has the following features:
• The TriggerSource feature (see I/O Controls Category) selects an internal signal as trigger.
• Programmable internal trigger, where the maximum line rate limit is related to the
ExposureTime feature.
• Exposure duration is user programmable (exposure maximum is dependent on the line rate).
Minimum exposure (in µs) is model dependent.
External Programmable Exposure
The External Programmable Exposure mode is similar to Internal Programmable except the
exposure start is an external user input.
• The TriggerSource feature selects an external signal line as trigger.
• Line rates and exposure limits are defined by Internal Programmable Exposure.