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Collimated backlight illumination

This form of backlighting is useful for measurement tasks that require a homogeneous illumination with no scattered ligth.

This technique produces a collimated beam of light, and is sometimes referred to as telecentric illumination. This form of backlighting is useful for measurement tasks that require a homogeneous illumination with no scattered light. It produces a distinct silhouette even when imaging transparent items.

When using a standard backlight, stray light can sometimes contaminate the edges of an object which produces an indistinct outline that is difficult to measure accurately.

Transparent pushpin under standard backlight (left) and under collimated backlight (right).