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Schneider polarization filters are constructed with dichroic sheets of laminated polymers that are cemented between protective glasses. Natural light and many artificial light sources used for illumination emit unpolarized light or at least light with a low degree of polarization. If light goes through a linear polarizer it will afterwards be linearly polarized in the orientation of the polarization axis of the filter. When using a circular polarizer, light will be either left or right circular polarized. A circular polarizer consists of a linear polarizer combined with a lambda/4 element at an angle of 45°. If a pair of corresponding polarizers is used (linear with linear or circular with circular), light passes when the orientation of their polarization axis is parallel. Light is blocked if the orientation is orthogonal to each other – this means for linear polarizers perpendicular polarization axes and for circular polarizer, left circular combined with right circular (or vice versa). In imaging applications, this effect is used to efficiently suppress reflections on dielectric or metallic surfaces because the reflected light is partially polarized (depending on material and reflective angle) and will be blocked if the filter is rotated in the appropriate orientation. |
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 Key Features Linear and circular versions High transmission Edge sealed versions
Applications Machine Vision and other imaging applications 3D projection, microscopy Material testing (e.g. mechanical stress analysis by photoelasticity) Scientific & research measurements |
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| Order Instructions | Ix - Type - Coating -
Mount - Size |
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| IF | mounted filter | ||||
| IFG | unmounted filter | ||||
| Type | AUF, AUC | ||||
| Coating | no coating, MRC | ||||
| Mount | SN 2 standard rotating mount with lock, threaded (IF only) |
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| Size | for IF: thread of the mount for IFG: diameter in mm |
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| Edge finish |
(IF only): - (no edge finish), RL (with edge sealing) |
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Call us for |
Example: IFG - AUC - MRC - 30 - RL (unmounted filter AUC with MRC coating, 30 mm diameter, with edge sealing)) |
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For industrial
appli-cations, a linear polarizer can often be used. If there are any
mirrors between the filter and the sensor, circular polarizer are
recommended (like for auto-exposure and auto-focus in SLR cameras).
Since the polymer film is sensitive to humidity, we recommend the
edge sealed version if the filter is not glued into a mount.
