Inline Steel Strip Edge Inspection with 3D Laser at Speeds Up to 350 m/min

The Flirtatious Glancer Laser Inspects Steel Edges at Record Speed

2026-09-09 Source: AT Sensors | Translated by AI 3 min Reading Time

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Traveling at a speed of 350 meters (13 miles) per minute, the CS 1280 system from AT Sensors inspects the edges of steel strips as they pass through the production line at Arcelormittal Bremen ...

At ArcelorMittal Bremen, steel coils are cut to size using blades, a process that takes place at high speed. This makes it difficult to ensure the quality of both the product and the blades. However, TS Sensors and Selmatec have now developed a real-time system ...(Image: AT Sensors) — At ArcelorMittal Bremen, steel coils are cut to size using blades, a process that takes place at high speed. This makes it difficult to ensure the quality of both the product and the blades. However, TS Sensors and Selmatec have now developed a real-time system ...
(Image: AT Sensors)

In steel processing, micrometers make the difference between scrap and quality, notes AT Sensors of Bad Oldesloe, where the company’s German branch is located. Even minor edge damage to steel strips can lead to form cracks, production interruptions, and increased scrap rates, the company adds. Together with AT Sensors and the system integrator Selmatec, the steel manufacturer ArcelorMittal Bremen has therefore developed an inline inspection system which can automatically and precisely detect sheet edges (so-called trim edges of coils) during ongoing production at speeds of up to 350 meters per minute. Note: A blade that loses its sharpness, a steel strip traveling at 350 meters per minute through a trimming line, and a sheet edge whose quality determines whether form cracks, production interruptions, and scrap—these are the requirements that defined the framework for the corresponding application currently being developed at ArcelorMittal Bremen’s cold rolling mill.

Camera-Based Detection Systems Fail

As has been emphasized, the challenge lay not only in optimizing defect detection. This is because production speeds of up to 350 meters per minute place high demands on sensor technology, data acquisition, and data processing. At the same time, the measurement data must be reliable and reproducible—regardless of material properties or environmental conditions. Conventional, camera-based solutions, in particular, often reached their limits in such situations. This is because they are highly dependent on lighting conditions. The decision was therefore made to use a 3D laser triangulation system from AT Sensors. According to Selmatec, this was a major benefit because the engineering teams at both companies share a very similar way of thinking and working, allowing the system integrator to serve as an optimal bridge between AT’s 3D laser profile sensors and ArcelorMittal as the end customer. “In plain terms, this means we can effectively translate the requirements and the steel manufacturer’s needs,” explains Michael Selent, CEO of Selmatec. According to Arcelormittal, 3D measurement of the steel edge geometry, burr formation, and notch depth is crucial for quality control. The requirements for the sensor were correspondingly demanding.

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