A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Wavelength-scanning coherent OTDR for dynamic high strain resolution sensing
Distributed vibration sensing in optical fibers opened entirely new opportunities and penetrated various sectors from security to seismic monitoring. Here, we demonstrate a most simple and robust approach for dynamic strain measurement using wavelength-scanning coherent optical time domain reflectometry (C-OTDR). Our method is based on laser current modulation and Rayleigh backscatter shift correlation. As opposed to common single-wavelength phase demodulation techniques, also the algebraic sign of the strain change is retrieved. This is crucial for the intended applications in structural health monitoring and modal analysis. A linear strain response down to 47.5 pε and strain noise of 100 pε/√Hz is demonstrated for repetition rates in the kHz range. A field application of a vibrating bridge is presented. Our approach provides a cost-effective high-resolution method for structural vibration analysis and geophysical applications.
Wavelength-scanning coherent OTDR for dynamic high strain resolution sensing
Distributed vibration sensing in optical fibers opened entirely new opportunities and penetrated various sectors from security to seismic monitoring. Here, we demonstrate a most simple and robust approach for dynamic strain measurement using wavelength-scanning coherent optical time domain reflectometry (C-OTDR). Our method is based on laser current modulation and Rayleigh backscatter shift correlation. As opposed to common single-wavelength phase demodulation techniques, also the algebraic sign of the strain change is retrieved. This is crucial for the intended applications in structural health monitoring and modal analysis. A linear strain response down to 47.5 pε and strain noise of 100 pε/√Hz is demonstrated for repetition rates in the kHz range. A field application of a vibrating bridge is presented. Our approach provides a cost-effective high-resolution method for structural vibration analysis and geophysical applications.
Wavelength-scanning coherent OTDR for dynamic high strain resolution sensing
Liehr, Sascha (author) / Münzenberger, Sven (author) / Krebber, Katerina (author)
2018-01-01
Article (Journal)
Electronic Resource
English
DDC:
624
Relative change measurement of physical quantities using dual-wavelength coherent OTDR
| BASE | 2017
Time-expanded phase-sensitive OTDR: High-resolution DAS based on dual-comb spectroscopy
| BASE | 2023
OTDR Distance Accuracy and Calibration
| British Library Conference Proceedings | 1996