Short Description

The above drawing shows the main elements of a Grablink-based line-scan acquisition system configured for Interleaved Line-scan Acquisition.

Such a system is composed of:

  • One asynchronous reset grabber-controlled exposure line-scan camera.
  • One acquisition channel of a Grablink Base, Grablink DualBase, Grablink Full or Grablink Full XR frame grabber configured for Interleaved Line-scan acquisition.
  • Two illumination devices, each being controlled by a specific strobe output of the frame grabber.

When the Interleaved Line-scan Acquisition is enabled, the Camera and Illumination Controller of the Grablink acquisition channel operates in the '2-program' mode.

In the 2-program mode, on every occurrence of a line trigger event, the Camera and Illumination Controller alternatively executes one of two programs. Each of these two programs defines a camera and illumination cycle including:

  • One Reset pulse controlling the start-of-exposure and the end-of-exposure of a camera cycle.
  • One Strobe pulse on one or the other Strobe output.

As for any line-scan imaging systems, the generation of the Line Trigger event may be configured with various schemes including the rate converter, the rate divider, etc... Usually, the Line Trigger event is obtained by processing signals delivered by a motion encoder.

As for any grabber-controlled imaging systems, the Camera and Illumination Controller implements the camera trigger overrun protection mechanism.

As for any line-scan imaging systems, the generation of the Trigger (Start-of-Scan) and End Trigger (End-of-Scan) events may be configured with various schemes.

All line-scan acquisition modes (WEB, PAGE and LONGPAGE) are compatible with Interleaved Line Acquisition.

The program sequence is initialized every start-of-scan to ensure that the first captured image line of an object is obtained with the same camera and illumination cycle program.