We present a fiber laser strain sensor (FLSS) with noise-equivalent sensitivity equal to or better than 80 p epsilon(rms) (Hz)(-1/2) at very low frequencies, from 100 mHz to several hundreds of hertz. The strain affects the fiber laser emission wavelength, and an imbalanced Mach-Zender interferometer (MZI) converts wavelength variations into phase-amplitude variations. The sensor has been also tested in the time domain by applying sinusoidal strain bursts: the device also shows a good signal-to-noise ratio at the lowest burst frequencies.
Fiber laser strain sensor device
BEVERINI, NICOLO';MACCIONI, ENRICO;STEFANI, FABIO;
2007-01-01
Abstract
We present a fiber laser strain sensor (FLSS) with noise-equivalent sensitivity equal to or better than 80 p epsilon(rms) (Hz)(-1/2) at very low frequencies, from 100 mHz to several hundreds of hertz. The strain affects the fiber laser emission wavelength, and an imbalanced Mach-Zender interferometer (MZI) converts wavelength variations into phase-amplitude variations. The sensor has been also tested in the time domain by applying sinusoidal strain bursts: the device also shows a good signal-to-noise ratio at the lowest burst frequencies.File in questo prodotto:
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