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Jan 29, 2025
Pairing coherent correlation OTDR with low-complexity analysis methods, we investigate the detection of fast temperature changes and vibrations in optical fibers. A localization accuracy of ~2 m and extraction of vibration amplitudes and frequencies is demonstrated.
Remote Sensing with High Spatial Resolution
Dec 02, 2024
Distributed fiber sensing based on correlation-aided phase-sensitive optical time domain reflectometry is presented. The focus is on correlation as an enabler for high spatial resolution. Results from different applications are presented.
* This work has received funding from the Horizon Europe Framework Programme under grant agreement No 101093015 (SoFiN Project)
Pressure Wave Detection and Localization in Deployed Underground Fiber using Coherent Correlation OTDR
Dec 02, 2024
A deployed fiber with in-house and underground sections is interrogated with a coherent correlation OTDR. The origin and propagation speed of a hammer-generated pressure wave in the underground section is detected and acoustic signals are monitored.
* This work has received funding from the Horizon Europe Framework Programme under grant agreement No 101093015 (SoFiN Project)
Simultaneous Temperature and Acoustic Sensing with Coherent Correlation OTDR
May 26, 2023
Superimposed temperature variations and dynamic strain applied through a 400 Hz acoustic signal on a 195 m single-mode fiber section are successfully measured using a coherent correlation optical time domain reflectometry as an interrogator.
* This work was partially funded by the German Federal Ministry of Education and Research in the framework of the RUBIN project Quantifisens (Project ID 03RU1U071D)