| Autor: |
Ribeiro, Livia A., Rosolem, Joao B., Dini, Danilo C., Floridia, Claudio, Bezerra, Edson W., Cezar, Fabio A., Loichate, Marcelo D., Durelli, Anderson S. |
| Zdroj: |
Proceedings of SPIE; May 2012, Vol. 8439 Issue: 1 p84390F-84390F-9, 759520p |
| Abstrakt: |
We propose a fiber optic sensor array based on bend loss assessed by optical time domain reflectometry (OTDR). The sensor mechanism is based on optical fiber bending loss compressed by external pressure. An elastomeric surface is applied to the sensor in order to communicate external pressure to the fiber coil and also, this make sensor able to deal with degradation coming from aggressive environments. The sensing system proposed is able to monitor liquid or gas pressure in different environments, such as water, oil, alcohols, some diluted acids and others, depending only of elastomeric membrane choice. In order to protect the sensor stage against environmental degradation a plastic packaging was chosen. Bend loss measurements is taken concerning the number of fiber loops involved in the sensor, pump signal wavelength and temporal width. This long for the best parameters in the sensor construction. The specific case of the sensor applied to water percolation monitoring from embankment damns is detailed in this paper; for this application the sensor array have a number of at least six stages totally independent each other, in such a way that each stage can be developed to monitor a specific environment. Sensors have shown good performance in field tests, reaching work range from 0.1 to 0.6 atm with 0.05 atm of precision. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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