We have developed a Fiber Laser Strain Sensor (FLSS) which shows noise-equivalent sensitivity equal to or better than 150p epsilon(r.m.s)./(Hz)(1/2) at very low frequencies, from 50 mHz to several tens of Hz. The strain acts on the fiber laser emission wavelength, and an imbalanced Mach-Zender Interferometer (MZI) converts wavelength variations into phase-amplitude variations. In the time domain the device shows a good signal-to-noise ratio also at the lowest tested frequency of 50 mHz, with a resolution better than 1 n epsilon(r.m.s). The device can find application in many fields, primarily in geological prospecting and in monitoring of civil structures.
|Autori:||Maccioni E; Beverini N; Morganti M; Stefani F; Falciai R; Trono C|
|Titolo:||Low-frequency strain sensor using a fiber Bragg laser|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1393/ncb/i2007-10413-8|
|Appare nelle tipologie:||1.1 Articolo in rivista|