在这里，我们将关注一个真正的游戏规则，即使是陡峭的侧面（≥90°）也可以进行光学横向探测，从而实现对部件的整个表面进行光学探测。让我们仔细了解一下垂直聚焦探测。

Imagine you work in the automobile industry, and you want to measure the bore hole of an injection valve. Until now, geometries with steep flanks were not possible to measure optically. If it wasn’t for Vertical Focus Probing, you’d still have to stick to tactile measurement systems for the lateral probing of components with vertical surfaces. But since Vertical Focus Probing has come into play, the optical probing of components over the entire surface, and thus, also of steep flanks, has been possible. Vertical Focus Probing provides results in high accuracy, high resolution and after short measuring times. Due to the area-based measuring principle which results in high measurement point density, a large number of measuring points can be used for the evaluation of, e.g., form deviations. This enables robust measurements, especially of small geometries.

Vertical Focus Probing is an optical technology which is based on the use of partial light. That means that not only coaxial light, but also light from different directions is used. As a result, individual light rays are diffusely reflected from vertical surfaces. They are captured again by the objectives of our measurement systems, enabling traceable and repeatable high-resolution measurements of slope angles with more than 90°. Thus, measurements of inner geometries and micro holes are possible.