An all-fiber system for simultaneous interrogation of distributed strain and temperature sensing using spontaneous Brillouin scattering
We demonstrate a low-loss, long-range, single-ended distributed optical fiber sensor to measure both temperature and strain simultaneously and unambiguously. By using the Landau-Placzek ratio and cascaded Mach-Zehnder interferometric filters, we measure both the intensity and the frequency changes i...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
2000.
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| Subjects: | |
| Online Access: | Get fulltext |
| Summary: | We demonstrate a low-loss, long-range, single-ended distributed optical fiber sensor to measure both temperature and strain simultaneously and unambiguously. By using the Landau-Placzek ratio and cascaded Mach-Zehnder interferometric filters, we measure both the intensity and the frequency changes in the Brillouin backscattered signal. Strain and temperature measurements can then be independently resolved. A temperature resolution of 4°C, a strain resolution of 290 µ.epsilon, and a spatial resolution of 10m have been achieved for a sensing length of 15 km. |
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