An optical bore hole sensor based on additive manufacturing
von Andreas, Heinrich
A. Heinrich, B. Sorg, A. Grzesiak, U. Berger, DGAO Tagung, 2015, Brno, Tschechien
To measure the inner shape of a bore hole is one of the most common tasks in industrial metrology. If an optical sensor is used, the shape can be recorded in a fast way with a high data density.
Here we focus on shape metrology of bore holes using the light section technique. Thereby the illumination optics images light coming from a light source onto the inner wall of the bore hole. A camera records the scattered light from the wall. From the images one can calculate the diameter of the hole using standard triangulation formulas.
For the set-up two points are essential: First, the light source and the camera need to be miniaturized, so that the sensor can “dive into” the bore hole. Second, as the illumination is from “top”, the optical set-up needs to redirect the light into a horizontal 360° ring onto the wall of the hole. For this we developed a single optical component, which was fabricated using Additive Manufacturing techniques.
Here we present the optic design of our sensor. Additionally we discuss the challenges and advantages of using Additive Manufacturing for design and manufacturing of our optics. The performance of the whole prototype will be shown as well