In contrast to tactile measurement technology, optical measurement processes use light for contact-free measurement of the test object’s properties. This technology makes use of the physical principles of absorption and reflection to capture the properties of whole surfaces and not just individual measuring points.
Optical measurement processes are acknowledged to be very precise and fast – response times are short because measurement and digital transmission take place almost in real-time. These processes are suitable for accomplishing very complex and critical measuring tasks. Optical measurement processes can be used in many applications; one of their key advantages is that they are contact-free and therefore non-destructive – in other words, there can be no damage to the surface of the component.
Optical measurement technology is suitable for a wide variety of applications: examples range from quality assurance in the manufacturing industry to speed limit enforcement for increased road traffic safety. A combination of optical and tactile measurement technologies opens up extensive scope for innovative developments. In the automotive industry, the spectrum includes full-vehicle measurements as well as cylinder pressure measurements.
100 percent monitoring with end-to-end traceability has become an essential tool to meet ever-increasing quality demands in the manufacturing industry. Some manufacturing environments even require surface quality inspections in the nanometer range. Various high-speed light-measuring methods are available, depending on the surface quality of the test objects.
Light-barrier measuring instruments provide an exceptionally fast and accurate way of measuring vehicle speeds. Multiple light sensors are arranged behind one another to generate several light barriers. As soon as a driver passes through a light barrier, the measuring instrument detects the vehicle and the driving speed is determined by means of a displacement-time calculation. If the speed limit is exceeded, at least one digital camera (depending on the system) is triggered automatically to capture an image.
