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;
2007-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
