Receta Automatic optical inspection system designed for Ferrite Cores

• To detect ferrite properties, dimensional defects (shape defects i.e.) and surface defects (surface cracks), two different sensors have been used: an optical sensor and an electromagnetic sensor in a new precision system. Researched by the Crash project: Defect detection and classification in ferrite cores.
• For Defect Detection, it introduced that the proposed system uses two different inspection sensors on the basis that
• complementary information from inspection based on different physical principles enhance confidence in the inspection results. Different techniques have been used for different kind of imperfections, following the users requirements: shape defects (optical) and surface defects (both optical and electromagnetic).
• In Shape Defects Detection and Measurements, The current practice of core production control is to select sample cores and measure their dimensions with a mechanical gauge which either accepts or rejects the core. To comply with this practice, an optical shape gauge system has been developed in order to quickly reject the obviously defective cores. The system measures the less obvious but still critical dimensional deviations from the standard values specified by the producer and represented by a reference digital image and a tolerance image, compared to the shape being measured. An important feature of the shape gauge system is its capability to handle arbitrarily oriented projections of the 3D objects. Therefore, the comparison of the measured and the reference shape is shift and rotation invariant.
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• In Dimensional measurement project of ferrite cores, Sipotek had an idea of a system integrated by two camera sets
• Since the ferrite cores are brittle and fragile, the feeding method is considerable. We use special belt to transfer them across a linear belt to a glass rotary plate where the cameras are ready to take images passing by.

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