Displacement measurement sensors
With any displacement measurement application, there is often a trade-off between the benefits and limitations of each measurement technology. Here, Micro-Epsilon compares four types of non-contact displacement measurement technology, advising on the pros and cons of each.
The use of non-contact displacement technologies in precision measurement is growing rapidly. Customers need to measure more accurately, to sub-micron or nanometre resolutions, and against difficult surfaces or materials that cannot be touched during measurements. These materials include silicon, glass, plastics, miniature electronic and medical components, as well as food-based surfaces.
This growth has pushed the development of new technologies, including the adaptation of existing technologies to meet these new measurement requirements and to improve measurement accuracy and resolution. Non-contact displacement sensors come in a wide variety of shapes, sizes and measurement principles. In practice, as well as eddy current and laser triangulation sensors, capacitive and confocal sensors are now popular. So it is critical that engineers have a greater understanding of the strengths and limitations of each principle when selecting the most appropriate one for the application.