A bandpass filter transmits a specific portion of the spectrum while blocking shorter and longer wavelengths. Increasing signal-to-noise results in improved contrast and better control over changes that may occur over time in ambient lighting conditions. In the case of bandpass filters, "broad" and "rugged" are necessary in most machine vision applications. This allows for use with wide angle lenses and for variations in the spectral output of LEDs and laser diodes, while providing environmental stability and mechanical durability.
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Features
- Enhance contrast for viewing of desired features
- Designed for use with all common LEDs used in machine vision lighting
- Also designed for use with laser diodes and capturing of UV excited fluorescence emissions
- Shields systems from the variability of unwanted ambient light
- Eliminates the need for cumbersome and expensive shrouding
- Helps to counter the negative effects of chromatic aberration
- Peak transmission > 90% *
- Less susceptible to angle of incidence variation than traditional interference filters
- Also used to mimic LED lighting when testing to determine the optimal wavelength of lighting to select for an application
- Aids in increasing LED light stability and longevity by facilitating operation at reduced power levels.
- For UV, Visible and/or Near-IR wavelengths
- Essential for imaging in the UV and near-infrared, as visible light should necessarily always be blocked in these cases.
*With the exception of BP365 > 85%
Mount & size options
- Threaded Mount, C/CS Mount, Slip Mount, Unmounted
- Threaded Mount Sizes: M22.5-M105
- Custom shapes and sizes; mounted or unmounted versions available
Ultraviolet (UV)
UV Pass filters transmit selected UV wavelength ranges. Typically these filters must pass UV light while blocking visible and near-IR wavelengths. They can be placed over lenses and are sometimes placed over UV light sources to trim/block output of visible light.
UV Blocking filters typically transmit visible light while blocking UV light over a specified range. These filters are used in UV fluorescence applications.
Visible
Block all unwanted visible, UV and near-IR wavelengths except for a specific portion of the visible spectrum. Typically these are matched to the wavelength output of an LED light, laser diode or visible fluorescence emitted by an inspection subject following excitation with UV light. In these cases the subject typically appears white or lighter in color when the filter is used together with a monochrome camera.
Visible block filters improve resolution by reducing the wavelength range of light allowed to pass through the camera lens, thus eliminating chromatic aberrations.
Near-Infrared (Near-IR)
Near-IR Pass filters block all UV and visible wavelengths so that maximum contrast can be achieved while using near-IR illumination provided by the sun or artificial light sources. Often they are matched to the output wavelength of an LED or laser diode. In the presence of normal room light or daylight conditions, the desired contrasting effect is often completely lost without the use of a near-IR pass filter.
Near-IR blocking filters block all or selected near infrared (and sometimes red) wavelengths of light. This is particularly important in color imaging applications in order for a color camera to be able to produce good color rendition. When used together with a monochrome camera, these filters can also help to alleviate problems caused by overly bright lighting conditions. Improve resolution in the IR
Useful for
Industrial inspection, security, traffic control, medical and forensic applications
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