Some of the more common reasons for this follow:
The advantage of using LED illumination is the lack of speckles and the fact that illumination in the visible range is usually classified in LED class 1 or 2, not requiring complex precaution measures.
Structured LED illumination consists of
LED light sources produce a homogeneous spot and are usually available in different colours, ranging from red to blue, including ultraviolet, infrared and white. As white light is not available as laser light, but might be important for colour applications. LED structured light offers a viable alternative option.
Using a pattern template, different patterns such as single lines, multi- lines, crosses or spots with crisp edges can be created. Customised pattern templates for structured LED lights can be produced at far lower cost, compared to optical elements for laser solutions.
Using a lens allows scaling of the pattern to the right size for a defined working distance. When selecting the correct lens, the main focus should be given to the quality of the lens to deliver maximum resolution at the same time as reducing image defects such as distortion.
Despite the possibilities the use of structured LED illumination offers, lasers are often indispensable for many triangulation tasks, as line width of 10µm can be achieved, compared to LED lines being minimum 50µm wide.