Interrogation of a Sensor Array of Identical Weak FBGs using Dispersive Incoherent OFDR
[EN] Incoherent Optical Fourier-Domain Reflectometry incorporating a dispersive delay line is used for the interrogation of an array of three identical fiber Bragg gratings with a Bragg wavelength of 1552.81 nm, reflectivity of 19.3 dB and 10-cm separation. The dispersive delay line induces differen...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/83359 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/83359 |
| Access Level: | acceso abierto |
| Palabra clave: | Optical fiber sensors OFDR Dispersive delay line Fiber Bragg gratings Sensor interrogation TEORIA DE LA SEÑAL Y COMUNICACIONES |
| Sumario: | [EN] Incoherent Optical Fourier-Domain Reflectometry incorporating a dispersive delay line is used for the interrogation of an array of three identical fiber Bragg gratings with a Bragg wavelength of 1552.81 nm, reflectivity of 19.3 dB and 10-cm separation. The dispersive delay line induces different delays in the wavelengths reflected by each grating, thus being sensitive to Bragg wavelength shifts. Compared with conventional incoherent Optical Fourier-Domain Reflectometry, dispersive effects decrease the spatial resolution, which in our experiments reached a value of 1.2 cm in fiber at a measurement bandwidth of 10 GHz. As a quasi-distributed temperature sensor, the array shows an accuracy of ±0.5ºC for temperatures up to 100ºC, and an estimated total measurement range of 540ºC. Tradeoffs between bandwidth, scan time, dispersion-dependent spatial resolution, and accuracy, are also analyzed. |
|---|