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Optical filter / for telecentric lenses
Light filtering is a typical need in machine vision measurement applications. For instance, you may need to avoid possible interactions between your LED illuminator and other light sources in an industrial environment.Moreover, sun light is very frequently causing errors in imaging systems due to unexpected reflections from the surface of the parts being measured.
In these cases, a band-pass or long-pass filter that matches the emission wavelength of the illuminator is usually integrated in front of the objective: this way, only the light coming from the illuminator is collected while the rest of the spectrum is cut out.
Furthermore, many machine vision applications require monochromatic illumination in order to enhance or suppress particular object features: under these conditions, only the features with a certain color are imaged and can be measured.