Optical filters are essential components for machine vision applications. They are used to maximize contrast, enhance color, improve subject recognition, and control the light reflected from the inspected object. A machine vision filter is not just a machine vision filter. Here’s what to look for when choosing a filter for your machine vision system:
Full line of filters, single substrate and high hardness coated, created specifically for industrial machine vision applications
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Vision system filters increase the contrast of the object under inspection, improving the system’s ability to distinguish the desired features.
Higher contrast allows for greater inspection accuracy and increased inspection system speed. The effect of the presence of ambient light, or its possible variation over time, is minimized with the use of filters, thus creating the conditions for good stability of the operating conditions of the vision system over the long term.
When combined with correct lighting, the optical filter is one of the most important factors in ensuring the ability of any vision system to operate reliably throughout its life cycle.
A wide range of filters are available, designed for quick and secure mounting on CCD and CMOS camera lenses and lenses.
The proposed filters are protected by a coating capable of ensuring a long life even in the presence of humidity, heat and vibration. They have also been designed to withstand repeated cleaning cycles, even with slightly aggressive solvents.
Filters are available in both standard sizes, which can be fitted to most commercial lenses, and in special sizes and features.
Typical applications:
Selection of a predetermined color
Suppression of a color
Suppression of ambient light
Selection of light from infrared sources
Polarization of light
Selection of light from UV sources
Reduction of light from unwanted light sources
Filters for Infrared LED Illuminators
Series of optical filters for the selection of infrared wavelengths.
Used for all near-infrared applications to block visible wavelengths.
Typical applications are the elimination or attenuation of unwanted effects of ambient light or the analysis of particular features of objects that are highlighted by infrared illumination.
This series of filters must be combined with the INF series of illuminators with an emission wavelength of 880 nm.
Available with standard threads M25.5 and M27 and with special threads up to M105.
Example of use.
On the left, a monochrome image obtained with a white illuminator without a filter.
On the right, the same image illuminated with an infrared source and a BP880 filter that highlights only the useful information
Example of use.
Image on the left with evident influence of ambient light.
On the right the same image obtained with infrared illumination and BP880 filter that eliminates the influence of ambient light.
Transmission curve of infrared filters 880 nm.
The filter lets through all wavelengths around 880 nm and completely blocks the visible part
Available with standard thread M25.5 and M27 and with special threads up to M105.
Filters for Red LED Illuminators
Series of optical filters for the selection of wavelengths around 625-635 nm.
Used for all applications where a red illuminator is present or it is necessary to select particular chromatic characteristics of an object illuminated with white light. Typical applications are the elimination or attenuation of unwanted effects of ambient light or the analysis of particular characteristics of objects that are highlighted by red illumination.
This series of filters is to be combined with the RED series of illuminators with emission wavelengths of 625 and 635 nm.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of red filters 625-635 nm.
The filter lets through all wavelengths around 625-635 nm and completely blocks the other wavelengths.
Example of use.
On the left, a monochrome image obtained with a white illuminator without a filter.
In the center, the same image obtained with a commercial photographic filter.
On the right, the same image illuminated with a red source and a BP635 filter that highlights only the useful information relating to the product code.
Filters for Green LED Illuminators
Series of optical filters for the selection of wavelengths around 525 nm.
Used for all applications where a green illuminator is present or it is necessary to select particular chromatic characteristics of an object illuminated with white light. Typical applications are the elimination or attenuation of unwanted effects of ambient light or the analysis of particular characteristics of objects that are highlighted by green illumination.
This series of filters is to be combined with the series of GRE type illuminators with an emission wavelength of 525 nm.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of infrared filters 525 nm.
The filter lets through all wavelengths around 525 nm and completely blocks the visible part
Available with standard thread M25.5 and M27 and with special threads up to M105.
Example of use.
The use of green filters combined with green LED illuminators allows for high suppression of ambient light.
Example of use.
Using green filters allows you to select particular colors of objects or increase the contrast of the image.
Filters for Blue LED illuminators
Series of optical filters for the selection of wavelengths around 470 nm.
Used for all applications where a blue illuminator is present or it is necessary to select particular chromatic characteristics of an object illuminated with white light. Typical applications are the elimination or attenuation of unwanted effects of ambient light or the analysis of particular characteristics of objects that are highlighted by blue illumination (fluorescence effect).
This series of filters is to be combined with BLUE type illuminators with an emission wavelength of 470 nm.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of red filters 470 nm.
The filter lets all wavelengths pass around 470 nm and completely blocks the other wavelengths
Example of use.
Using blue filters increases the contrast of written and printed codes. red source and BP635 filter that highlights only the useful information related to the product code.
Filters for Ultraviolet LED illuminators
Series of optical filters for the selection of wavelengths around 365 nm.
Used for all applications where an ultraviolet illuminator is required. Typical applications are the elimination or attenuation of unwanted effects of ambient light or the analysis of particular characteristics of objects that are highlighted by blue illumination (fluorescence effect).
This series of filters must be combined with the series of ULV illuminators with an emission wavelength of 365 nm.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of infrared filters 365 nm.
The filter lets through all wavelengths around 365 nm and completely blocks other wavelengths.
Example of use.
Using ultraviolet illumination allows you to identify materials that fluoresce.
Polarizing filters for visible LED illuminators
Series of polarizing optical filters for visible light.
Typical applications are the elimination or attenuation of unwanted effects caused by reflective or particularly shiny objects
The filter is mounted on a rotating ring to correctly position the filter on the correct polarization angle.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of polarizing filters.
The filter works on the entire visible spectrum.
Example of use.
The use of polarizing filters eliminates the reflective effect of protective films.
Example of using the polarizing filter.
Filters to block infrared radiation
Series of optical filters for blocking infrared radiation.
Used for all applications where there is a high presence of unwanted infrared radiation (high temperature objects).
Typical applications are the elimination or attenuation of unwanted effects caused by strong infrared emissions, often present in high temperature applications.
Available with standard thread M25.5 and M27 and with special threads up to M105.
Transmission curve of polarizing filters.
The filter works on the entire visible spectrum.
Example of use.
Using filters to block infrared radiation allows you to observe phenomena that would otherwise be unobservable because they would cause the camera to overexpose.
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