The necessity to measure precisely, together with the development of complex surfaces, or of surfaces that cannot be touched during the process, trigger the development that the use of contactless technologies for detection and measurement is currently living through. Sensors of multiple shapes and sizes, based on different functioning principles, are being launched on the market.

By combining different optical techniques with modern computer systems, artificial vision systems are one of the most comprehensive tools for contactless detection and measurement. They are flexible, versatile and powerful, and their price is usually of several thousands of euros for the simplest projects.

The possibilities brought by vision systems are fascinating for any engineer, but if the matter to be solved is simple, and does not require an excessive flexibility, it is interesting to review the different specific sensors existing on the market, in order to determine whether one of the technologies developped could provide a quick and successful solution to the matter.

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