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.

Low-frequency strain sensor using a fiber Bragg laser

MACCIONI, ENRICO;BEVERINI, NICOLO';STEFANI, FABIO;
2007

Abstract

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.
Maccioni, Enrico; Beverini, Nicolo'; Morganti, M; Stefani, Fabio; Falciai, R; Trono, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/111102
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