Line sensor sizes
The length of line sensor depends on pixel size and resolution. The larger is the line sensor, the larger are the dimensions of a lens.
A line scan camera is an image capturing device having a CCD sensor which is formed by a single line of photosensitive elements (pixels). Therefore, unlike area sensors which generate frames, in this case the image acquisition is made line by line.
One single scanning line of a line scan device can be considered as a one-dimensional mapping of the brightness related to every single point of an observed line. A linear scanning generates a line, showing on the Y axis the brightness of each point given in grey levels (from 0 to 255 levels).
A sudden change of the grey level in a single point corresponds either to a point on the edge of an object or to any colour or aspect variation of the acquired image. Detection of this change allows a precision measurement, thanks also to the high resolution on the linear sensor which is considerably better than the resolution of an area imager.
For instance, by using a backlight you may know the position and width of a strip, by observing the transition of every single point; or detect the impurities (holes, scratches, spots etc.) on any inspected surface.
For this type of camera the use of lenses for line scan cameras are recommended.
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