Exposure Modes In Detail - Dalsa Linea Color CL User Manual

The camera can grab images in one of three ways. You determine the three imaging modes
using a combination of the Exposure Mode parameters (including I/O parameters), Exposure
Time and Line Rate parameters.
Description
Internal line rate and exposure time
External line rate and exposure time
EXSYNC pulse controlling the line
rate. Programmed exposure time.
The parameters used to select the imaging modes—trigger sources (sync), exposure time,
and line rate—are grouped together as the Camera Controls.
Camera Controls
Parameter
Line Rate (in Hz)
Exposure Mode
Exposure Time

Exposure Modes in Detail

1. Internally Programmable Line rate and Internally Programmable Exposure Time (Default)
Line rate is the dominant factor when adjusting the line rate or exposure time. When setting
the line rate, exposure time will decrease, if necessary, to accommodate the new line rate.
When adjusting the exposure time the range is limited by the line rate.
: The camera will not set line periods shorter than the readout period.
Note
GenICam parameters to set:
I / O Controls > Trigger Mode > Off
2. External Line Rate and External Exposure Time (Trigger Width)
In this mode, EXSYNC sets both the line period and the exposure time. The rising edge of
EXSYNC marks the beginning of the exposure and the falling edge initiates readout. Note:
40 
Line Rate
Internal, programmable
Controlled by EXSYNC
pulse
Controlled by EXSYNC
pulse
Figure 18. Exposure controls
Description
Camera line rate in Hz. Only available when the start line trigger parameter is
disabled (Trigger Mode off).
Set the operation mode for the camera's exposure.
Trigger Width or Timed. Trigger Width is only available when Trigger Mode is
enabled.
Trigger Width
Uses the width of the current line trigger signal pulse to control the exposure
duration.
Timed
The exposure duration time is set using the Exposure Time feature and the
exposure starts with the Line Start event.
Sets the exposure time (in microseconds). Exposure Mode feature must be set to
Timed
Exposure Time
Internal programmable
External (EXSYNC)
Internal programmable
Trigger Source
(Sync)
Internal
External
External
4. Camera Operation