A4.5 Influence of Temporal Strain Evolution on Distributed Strain Sensing with OTDR in Polymer Optical Fibers
- SMSI 2020
(did not take place because of Covid-19 virus pandemic)
- SMSI 2020 - Sensors and Instrumentation
- A4 Measurement of Force, Pressure, and Strain
- S. Dengler, N. Schmidt, M. Luber, J. Fischer, O. Ziemann, R. Engelbrecht - Technische Hochschule Nürnberg Georg Simon Ohm, Nuremberg (Germany), H. Hangen - HUESKER Synthetic GmbH, Gescher (Germany)
- 75 - 76
To measure strain in ground and earthworks, polymer optical fibers (POF) applied to geotextiles can be used. In case of an optical time domain reflectometry (OTDR) measurement, the backscattered intensity increases in strained areas. The increase of backscattering (IOB) has been characterized by gradual elongation of the fiber up to 5% with different elongation levels and holding times. A dynamic behavior of the IOB has been proved. It could be shown that for the tested elongation patterns the IOB varies around 0.3% up to 0.9% for absolute strain less than 2.2% and up to 5%, respectively.