Strain measurement systems with defined spots along the fiber

Monitor Length Changes over Long Distances

This measuring technology is based on so-called fiber Bragg gratings (FBGs). FBGs are created by means of the fiber being exposed to intense UV radiation at a certain position at a periodical pattern. Several FBGs can be written to a single fiber (typically 15 to 20) and can be read out simultaneously with a single system. This technology enables you to monitor changes along the glass fiber across long distances of up to several kilometers. Standard gratings are temperature-resistant up to approximately 100 °C at a spatial resolution of about one centimeter.

Polytec makes fiber sensors depending on the interrogator (readout system) used and the application – fully in line with your individual requirements. In this regard, preassembled fiber optics cables usually achieve 1 % strain, while fibers bonded directly can – depending on their coating – be loaded up to 5 % beyond their original length.