Question 4:
What does it take to validate a vision inspection system?
Answer to Question 4:
Usually, an independent institution carries out the validation of a technical system. This institution will issue a declaration of conformity that will testify to the results of the validation.
The validation of a vision inspection system can be considered at different levels:
Software Integrity: Has the software been developed according to international standards like IEC 61508? Are there coding standards available that are applied during the development?
Safety Integrity: According to David J Smith, Kenneth G L Simpson, the need to specify quantitative safety targets for overall systems, and for their separate protection sub-systems, has grown rapidly over the last ten years. This feature has become known as Functional Safety and numerous standards and guidelines have emerged, most of which incorporate the idea of safety-integrity levels (SILs).
Process Integrity: This is an important point as we have to make sure that the inspection process is deterministic. This means that a predefined set of parameters will always cause the inspection algorithm to find a certain type (or size) of defect. Most vision inspection systems have a problem with this. They find small defects but we can never be sure what they did not find, meaning: what went into the finished roll.?
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