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

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SIMTOS (Seoul International Machine Tool Show)

A Blue-Light Laser System Can Solve the Problem

Based on these requirements, AT Sensors ultimately recommended that Selmatec use the “C6-1280CS23-29 GigE” 3D laser profile sensor, which is a Class 3R laser with a wavelength of 405 nanometers. The blue-light laser used in this sensor accurately detects even very fine edge structures and delivers stable measurement results even on highly reflective metal surfaces. The sensor operates on the principle of laser triangulation. This means that a projected laser line is captured by a CMOS sensor from a defined viewing angle and converted into a high-resolution 3D profile of the strip edge, with 1,280 measurement points per profile. The resolution in the X direction reaches 21.9 micrometers (0.00086 inches), and the resolution in the Z direction is 0.7 micrometers (0.000028 inches). In addition, it offers a profiling rate of up to 174 kilohertz and a field of view of 28 millimeters (1.10 inches). This allows even the smallest geometric deviations, burrs, or tears to be reliably detected. Thanks to AT Sensors’ modular sensor portfolio, the field of view can be precisely adapted to the specific application. In addition, “intelligent” evaluation functions ensure stable and reproducible measurement data even under demanding production conditions.

Coil Knives Can Now Be Replaced in a Timely Manner for the First Time

An additional benefit arises in tool monitoring. If the blade used to cut the coils loses its sharpness, the quality of the edges deteriorates progressively. Continuous monitoring now makes it possible, for the first time, to precisely determine the optimal time for a blade change. For ArcelorMittal Bremen, this means greater process stability, less scrap, and consistently high quality of the end product. Here’s how the system works: As the steel strip continuously passes through theslitting line, the laser profile sensor continuously captures high-resolution 3D profiles of the strip edge. The software developed by Selmatec immediately analyzes the geometric data and detects irregularities or defects in real time. The results are transmitted via standard interfaces such as OPC-UA, Profinet, or Modbus to higher-level control systems, where they can be processed immediately. Defects can thus be automatically marked, or process parameters can be specifically adjusted. This results not only in pure quality control but also in active process monitoring.

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Date: 08.12.2025

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