4 Functionality
Figure 4.29: Example of decimation 2 on image of injection needle
4.4
Trigger and Strobe
4.4.1
Introduction
The start of the exposure of the camera’s image sensor is controlled by the trigger. The trigger
can either be generated internally by the camera (free running trigger mode) or by an external
device (external trigger mode).
This section refers to the external trigger mode if not otherwise specified.
In external trigger mode (
TriggerMode
=On), the trigger is applied according to the value of the
TriggerSource
property (see Section 4.4.2). The trigger signal can be configured to be active
high or active low (property
TriggerActivation
). When the frequency of the incoming triggers
is higher than the maximal frame rate of the current camera settings, then some trigger pulses
will be missed. A missed trigger counter counts these events. This counter can be read out by
the user. The input and output signals of the power connector are connected to the
Programmable Logic Controller (PLC) which allows powerful operations of the input and
output signals (see Section 5.6).
A suitable trigger breakout cable for the Hirose 12 pol. connector can be ordered
from your Photonfocus dealership.
The exposure time in external trigger mode can be defined by the setting of the exposure time
register (camera controlled exposure mode) or by the width of the incoming trigger pulse
(trigger controlled exposure mode) (see Section 4.4.4).
An external trigger pulse starts the exposure of one image. In Burst Trigger Mode however, a
trigger pulse starts the exposure of a user defined number of images (see Section 4.4.6).
The start of the exposure is shortly after the active edge of the incoming trigger. An additional
trigger delay can be applied that delays the start of the exposure by a user defined time (see
Section 4.4.5). This is often used to start the exposure after the trigger to a flash lighting
source.
4.4.2
Trigger Source
The trigger signal can be configured to be active high or active low by the
TriggerActivation
(category
AcquisitionControl
) property. One of the following trigger sources can be used:
Free running
The trigger is generated internally by the camera. Exposure starts immediately
after the camera is ready and the maximal possible frame rate is attained, if
AcquisitionFrameRateEnable
is disabled. Settings for free running trigger mode:
TriggerMode
= Off. In Constant Frame Rate mode (
AcquisitionFrameRateEnable
= True),
exposure starts after a user-specified time has elapsed from the previous exposure start so
that the resulting frame rate is equal to the value of
AcquisitionFrameRate
.
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Summary of Contents for DR1-D1312(IE)-G2
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