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Schneider-Kreuznach Filters

Schneider-Kreuznach optical filter products

Schneider-Kreuznach machine vision filters have been specifically designed to satisfy all the requirements of industrial users in research, engineering and production.

These filters feature improved optical quality, are provided with detailed technical parameters, and have passed a strict quality assurance process.


Variants

Colour filters

Coloured filters with a wide range of tones are used to block certain wavelength ranges of the visible light. These filters absorb the blocked light and are therefore insensitive to the angle of incidence.

Blue and green filters are bandpass filters that transmit wavelengths that correspond to the human eye.

Red, orange and yellow filters are long-pass filters that pass light at wavelengths longer than their characteristic cut-on wavelength – typically the wavelength at which the transmission is 50% of the maximum. These filters use absorptive glass, that is robust, cost-effective and insensitive to angle of incidence.

In machine vision these filters are typically used in front of a lens on a monochrome CCD or CMOS camera to improve image contrast. The appropriate type of filter has to be selected with respect to the colour of the object and the type and / or colour of the illumination.

Since they affect the composition of the transmitted light, they are usually not suitable for use with colour cameras.

Neutral density filters

Neutral Density filters evenly reduce the transmittance of light over the entire visible spectrum. They decrease the brightness of an image without changing the depth of field (DoF).

They attenuate light by absorbing a part of the energy of the visible wavelength, without influencing the colour balance.

Neutral density filters are used to control the intensity of light going through an optical system to avoid over-exposure, blooming on imaging sensors and prevent damage on light sensitive measuring sensors.

Polarisation filters

Natural light and most light sources emit un-polarised light. Polarisers are an excellent solution in applications that require glare reduction due to reflected light. They are also used in several optical instruments.

Unpolarised light passing a linear polarising filter will be polarised in the orientation of the filter's polarising axis.

A circular polariser is a combination of a linear polariser and a quarter wave retarder. Circular polarisers are recommended if mirror optics are within the optical path of the filter to the sensor.

Schneider-Kreuznach polarisers are designed to fulfil industrial requirements. They are made of dichroic laminated polarising polymers cemented between 2 slides of protective glass. Polarisers are sensitive to humidity, therefore we recommend our unmounted filters as edge sealed version.

Linear and circular polarisers are available as glass filters, un-mounted in sizes 10 mm to 74.0 mm diameter and mounted with common thread sizes M 25.5 to M 67 or as film.

Longpass filters

As the name indicates, these filters transmit the longer wavelength range of light. Schneider-Kreuznach longpass filters are made out of high quality glass, combined with several high quality interference layers.

The production of these interference filters is an excellent example of the most modern production techniques. To bond the layers to the glass surface, Schneider-Kreuznach uses magnetron sputtering to guarantee the best possible quality and a homogeneous surface. This also ensures stability of the cut-on wavelength.

Shortpass filters

The Schneider-Kreuznach magnetron coated industrial shortpass filters transmit shorter wavelengths of light. As with the longpass filters, the magnetron layers are applied by means of a special coating process called sputtering.

They have steep slopes and high transmission at stable cut-off wavelengths.

UV and IR cut filters

UV & IR cut filters block troublesome UV/ VIS or NIR light.

They are robust, cost-effective and insensitive to angle of incidence. Additional to their filter function they are also a protective window in imaging systems.

Bandpass filters

As the name indicates, these filters transmit a defined wavelength range. Schneider-Kreuznach bandpass filters are made out of high quality glass, combined with several high quality interference layers.

The production of these interference filters is an excellent example of the most modern production techniques. As with the longpass and shortpass filters, to bond the layers to the glass surface, Schneider-Kreuznach uses magnetron sputtering to guarantee the best possible quality and a homogeneous surface, whilst ensuring stability of the cut-on wavelength.

Infrared pass filters

IR pass filters are long pass filters, transmitting only IR light. The Cut-on wavelength is defined at 50% transmittance of maximum. IR filters are absorptive filters, too.

They are used in front of a NIR sensor or an image sensor for NIR imaging where IR spectrum only is needed.

We offer several AR coating options, depending on filter type.