For filters and diffusers.
Set between the led and the diffuser, the polarizer helps to delete the reflection of the lighting on the workpieces to be controlled. The camera, equipped with a polarizer filter, a.k.a analyzer, can then start the analysis of the parts, without being disturbed by shiny effects. Polarizer can be very useful to lead a quality control of workpieces packed in transparent plastic bags.
Only available for visible wavelengths, the polarizer highly reduces the lighting power (about 50%).
BEWARE ! Since it has a short lifespan, the polarization properties of the polarizer have to be checked regularly.