Long Range Raman-Amplified Distributed Acoustic Sensor Based on Spontaneous Brillouin Scattering for Large Strain Sensing

A Brillouin distributed acoustic sensor (DAS) based on optical time-domain refractometry exhibiting a maximum detectible strain of 8.7 m [Formula: see text] and a low signal fading is developed. Strain waves with frequencies of up to 120 Hz are measured with an accuracy of 12 [Formula: see text] at...

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Detalles Bibliográficos
Autores principales: Bakhtiari Gorajoobi, Shahab, Masoudi, Ali, Brambilla, Gilberto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8915083/
https://www.ncbi.nlm.nih.gov/pubmed/35271194
http://dx.doi.org/10.3390/s22052047
Descripción
Sumario:A Brillouin distributed acoustic sensor (DAS) based on optical time-domain refractometry exhibiting a maximum detectible strain of 8.7 m [Formula: see text] and a low signal fading is developed. Strain waves with frequencies of up to 120 Hz are measured with an accuracy of 12 [Formula: see text] at a sampling rate of 1.2 kHz and a spatial resolution of 4 m over a sensing range of 8.5 km. The sensing range is further extended by using a modified inline Raman amplifier configuration. Using 80 ns Raman pump pulses, the signal-to-noise ratio is improved by 3.5 dB, while the accuracy of the measurement is enhanced by a factor of 2.5 to 62 [Formula: see text] at the far-end of a 20 km fiber.

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