Metal Inspection

Metal surfaces must undergo a reliable inspection, because defects impair the functions of steel tubes or medical engineering products. Relying to the often appearing strong structures of such surfaces, special robust vision techniques are needed to make, for example, geometric measurements. Our systems are prepared to provide a fully automated, 100 % inspection rate in a rough industrial environment.

Inner tube inspection

Our new inline inner tube inspection system has been developed to inspect the entire interior surface of short tubes. The inspection covers the detection of the smallest grooves and bumps, which cannot be seen by eddy current or ultrasound equipment. The pioneering 3D measurement technique allows easy identification of surface damages and makes geometric measurements with high accuracy, with a resolution as small as 50 µm.

Inner tube inspection »

Outer tube inspection

During the outer tube inspection, the entire exterior surface of the tube is inspected with a high throughput speed of up to 2 m/s. In this process, both the topography, i.e. the height information, and the color information from flat defects is evaluated. The resolution perpendicular to the transportation direction is approximately 0.08 mm and along the transportation direction it is approximately 0.7 mm.

Outer tube inspection »


Demands for the highest precision are focussed on the tip and the outer lateral surface of stainless stell needles. A vision system for injection needles must first separate the needles before performing a complete inspection and ensuring the subsequent reliable separation of rejected parts. A fully automated system places the acceptable parts in the appropriate packaging unit. Typical cycle times of 0.1 to 0.2 s per needle can be realized.