Rods provide uniform illumination
An
Edmund Optics product story
Edited by the Engineeringtalk editorial team
Jul 3, 2007
Also known as integrating rods, light pipes use total internal reflection to effectively randomise entrance angles at their output aperture.
Edmund Optics (EO) has released the TechSpeca family of light pipe homogenising rods for OEM illumination needs.
The rods use total internal reflection to turn a nonuniform light source into uniform illumination and deliver it to the target site.
These rods are ideal for applications where point sources such as LEDs must be combined and made to deliver even lighting.
Unlike traditional square integrating rods, TechSpeca rods have a hexagonal cross section.
The hexagonal shape provides a better match to spherical point source wave fronts, resulting in a 35% increase in coupling efficiency, allowing these light pipes to deliver brighter illumination for a given light source.
Also known as integrating rods, light pipes use total internal reflection to effectively randomise entrance angles at their output aperture.
The result is a homogenisation of the original light source's spatial intensity distribution, providing greater uniformity of illumination at the rod's end.
Because the homogenising effects of traveling through the rod are not wavelength or entry-angle dependent, the rods can mix the light from multiple sources into a uniform beam.
This allows OEMs to use the rods to combine the light from several LEDs to increase illumination intensity or to mix colours to obtain unusual spectral characteristics.
TechSpec Homogenising Rods are available in 2, 5 and 10mm apertures and have lengths approximately 12x the aperture size.
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