Basler SCOUT LIGHT User Manual download pdf (Page 54)

Image Acquisition Control

46 Basler scout light

When you operate the camera in trigger width exposure mode, you must use the camera’s

exposure setting to set an exposure time. The exposure time setting will be used by the camera to

operate the trigger ready signal.

You should adjust the exposure setting to represent the shortest exposure time you intend to use.

For example, assume that you will be using trigger width exposure and that you intend to use the

ExTrig signal to vary the exposure time in a range from 3000 µs to 5500 µs. In this case you would

use the exposure setting to set the exposure time to 3000 µs.

If you are using the trigger width exposure mode and the camera is operating with overlapped

exposures, there is something you must keep in mind. If the action of the ExTrig signal would end

the current exposure while readout of the previously acquired image is still taking place, the camera

will automatically continue the exposure until readout of the previous image is complete. This

situation is illustrated Figure 16 for rising edge operation. On the first cycle of the ExTrig signal

shown in the figure, the signal rises and falls while readout is taking place. Normally you would

expect exposure to take place only when the ExTrig signal is high. But since the signal falls while

the previous frame is still reading out, the camera automatically extends exposure until the readout

is complete. On the second cycle of the ExTrig signal shown in the figure, the signal rises during

previous frame readout, but falls after the readout is complete. This is a normal situation and

exposure would be determined by the high time of the ExTrig signal as you would expect.

Fig. 18: Trigger Width Exposure Mode with Overlapped Exposure

Selecting an Exposure Mode

You can set the exposure time parameter value and select an exposure mode from within your

application software by using the pylon API. The following code snippets illustrate using the API to

set the exposure time parameter and select the exposure mode:

// set for the timed exposure mode, set exposure time to 3000 µs

Camera.ExposureMode.SetValue( ExposureMode_Timed );

Note

The trigger width exposure mode is not available on slA750-60fm cameras. The

trigger width exposure mode is available on all other camera models.

ExTrig Signal

TrigRdy

Signal

Frame Readout

Frame N-1 Frame N

Exposure

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 165 166

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Basler SCOUT LIGHT User Manual Page 54