Aberlink improves backlighting for measurement
An
Aberlink product story
Edited by the Engineeringtalk editorial team
Nov 5, 2008
Aberlink have launched a product for backlighting components to be measured by a camera system mounted on a CMM.
The system contains a ring of alternate white and UV LEDs situated around the camera lens.
The white LEDs provide surface illumination, while the UV LEDs are used to produce backlighting as follows.
The component to be measured is placed on a plate containing a special reflective paper.
When a backlighting effect is required, the component is illuminated with UV light.
Any light striking the surface of the component is reflected and because it is UV remains invisible to the camera.
However, any light that passes by the component and strikes the reflective paper fluoresces and therefore becomes visible.
A sharp silhouette of the component is produced, as though it had been lit from underneath.
This allows very accurate measurement of a profile.
The Aberlink system negates the need for cumbersome light boxes and provides a fully controllable backlight source, which can easily be used over the whole bed of a CMM.
The fact that it is controllable in software is especially useful on CNC machines, when the user will often need to automatically switch between top and backlighting on a single component.
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