Multi-sensor system for surface inspection and 3D-geometry assessment

Markus Becker; Juergen Weber; Erhard Schubert

doi:10.1117/12.281264

25 September 1997 Multi-sensor system for surface inspection and 3D-geometry assessment

Markus Becker, Juergen Weber, Erhard Schubert

Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997) https://doi.org/10.1117/12.281264
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

This paper addresses an installed application in quality control where a 100% inspection of geometry (3D) and surface of cuboid (parallelpiped) and ring-shaped magnets is done using a system of 2 CCD matrix cameras, one of which is equipped with on-board processing components and a transmitted-light sensor with microcontroller based data processing for the measurement of the height of the objects. The geometry and surface properties are measured with a diffuse indirect IR-LED flash, mounted in a ring around the object and a telecentric lens to avoid perspective distortions due to different heights of the measured objects. The surface inspection looks for broken pieces, surface faults due to spalling/chipping and for cracks. The second CCD camera uses the same illumination and algorithm to inspect the surface of the other side of the objects after it has been turned around in a return conveyor belt. All components are triggered by separate light barriers and perform their tasks independently. The integration of the results of each measurement is done by an SPC which also controls the actors that handle the three different classes of objects (good, bad, rework). These actors are valves and the objects are separated by pressurized air. The main concern of this paper is the system aspect, how the measurement results are evaluated and combined to achieve a correct classification of the objects which are inspected by three independent sensors and arrive at unpredictable time intervals.

Citation Download Citation

Markus Becker, Juergen Weber, and Erhard Schubert "Multi-sensor system for surface inspection and 3D-geometry assessment", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); https://doi.org/10.1117/12.281264

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KEYWORDS

Inspection

Sensors

Image processing

Cameras

Actuators

Imaging systems

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