Systems with a Continuous Spot Sequence 

Record Strain Profiles Measuring up to 50 km

In the case of systems that measure in a dispersed manner, no sensors have to be incorporated into the fiber. Instead, backscattered light is evaluated by the fiber material itself so as to obtain the desired temperature information. These systems are based on the evaluation of Rayleigh scattering and enable the recording of strain profiles along the glass fiber up to millimeter resolution and along sections measuring up to 50 km long. So virtually every point of the glass fiber becomes the sensor. Conventional methods require hundreds or thousands of conventional strain gauges for this purpose, which calls for an immense amount of time and effort to be spent on installation.

To measure strain, the glass fiber requires direct contact with the inspection object so as to transfer its length or location changes 1:1.

Depending on the interrogator (readout system) used and the application, these may be low-cost conventional standard glass fibers or even custom-made ones produced by Polytec to suit your individual requirements.