Light can be polarised using polarisation films in the front of any industrial lighting. Flexible films from a thickness of 0.25 mm to 1 mm are available to the user for this purpose. Thicker filters from 2 mm are usually supplied as hard plastic sheets.
In addition, a glass polarisation filter is placed in front of the optics to selectively block or transmit polarised light. The principle of polarisation and the filter effect are described in detail in the chapter on polarisation filters. More examples can be found there.
By using a polarising film on the illumination and a polarising filter on the optics, interfering reflections can be avoided on:
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