Home

Previous

Up

Next

MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > General Topics > Line-Scan Inspection Topics > The Optical Setup
The Optical Setup

A lens is used to project the image of the observed line over the sensitive part of the CCD sensor.

For the sake of this introduction, the most prevalent attribute of the optical setup is the magnification ratio.

For instance, a particular line-scan based system is being designed to inspect a web over a 80cm width. The camera used is equipped with a CCD sensor the useful length of which is 28.67 mm.

If we define the magnification as ratio of the optical image to the real object, the required magnification ratio is 0.03584. Actually, this corresponds to a reduction in size from the real object to the optical image formed on the sensor. This reduction can be quantified as 27.90.

Let us assume that the CCD sensor size is 14x14 µm. The size of the corresponding pixel on the web is 0.39x0.39 mm.

Throughout this introduction, we will keep these numbers as an example of a representative application.