In industrial manufacturing, especially in automotive, microsystems and medical technology, there is an increasing trend towards filigree and complex structures. One example is injection holes for injection nozzles from 150 μm and smaller, with shape tolerances in the sub-micrometer range. Sensitive microcomponents are also used in microsystems technology, which have to be mounted in precise positions. In order to guarantee the quality of such components, measurement technology must also follow the trend towards miniaturization.
One approach to perform measurements in confined spaces is the use of fiber-optic distance sensors. The sensors offer great flexibility and are easy to integrate into production environments thanks to the small size of the probes. Since the measurement signals are transmitted purely optically in optical fibers, fiber-optic sensors are insensitive to electromagnetic interference, have negligible attenuation in long transmission distances and can be used for multipoint measurements. In addition, they are flexible, long-term stable and resistant to a variety of chemicals.