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Fig. 10. Specifying an encoder.
Example of a camera set-up, with an encoder.
When using a line scan camera together with an encoder, it is crucial to calculate the required
specifications of the encoder in order to maintain the same aspect ratio in both vertical and
horizontal resolution.
The horizontal resolution is given by the number of pixels in the 3CCD camera.
The vertical resolution is given by the pulses generated by the encoder.
Example:
The width of the object to be scanned is 1000 mm.
This means that each pixel “projected” on the object represents a square of 0.488mm.
In order to maintain the same vertical resolution, the encoder needs to generate 2048 pulses,
for a travel of 1000 mm.
With a max line frequency at 14.285 lines/sec. the vertical scanned length is
0.488 mm x 14285 = 6971 mm/sec.