Basler A400K Manual do Utilizador descarregar pdf (Página 63)

AW00118501000 Acquisition Control

Basler racer Camera Link 55

Trigger Width Exposure Mode

When trigger width exposure mode is selected, the length of the exposure for each line acquisition

will be directly controlled by the ExLSTrig signal. If the camera is set for rising edge triggering, the

exposure time begins when the ExLSTrig signal rises and continues until the ExLSTrig signal falls.

If the camera is set for falling edge triggering, the exposure time begins when the ExLSTrig signal

falls and continues until the ExLSTrig signal rises.

The minimum allowed exposure time for each acquired line is as shown in Table 8 and there is no

limit on the maximum exposure time. Keep in mind, however, that using a very long exposure time

can lead to significant degradation of the image quality.

Fig. 13 illustrates trigger width exposure with the camera set for rising edge triggering.

Trigger width exposure is especially useful if you intend to vary the length of the exposure time for

each captured line.

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

Exposure Overlap Time Max Abs parameter if you are parameterizing the camera with Basler pylon.

If you are parameterizing the camera via direct register access you must set the value of the

Exposure Overlap Time Max register. The Exposure Overlap Time Max setting will be used by the

camera to operate the Line Trigger Wait signal.

raL2048-

80km

raL4096-

80km

Min 2.0 µs 2.0 µs

Table 8: Minimum Allowed Exposure Times

If you are using a GenICam compliant tool such as the Basler pylon Viewer and

you attempt to set the exposure time to exactly the minimum allowed or to exactly

the maximum allowed, you will see unusual error codes. This is an artifact of a

rounding error in the GenICam interface architecture. As a work around, you could

set the exposure time slightly above the minimum or below the maximum. Values

between the minimum and the maximum are not affected by the problem.

ExLSTrig Signal Period

ExLSTrig Signal

Exposure

Fig. 13: Trigger Width Exposure with Rising Edge Triggering

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 129 130

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Basler A400K Manual do Utilizador Página 63