Abstract
An optical fiber vibration sensor based on a polarization
diversity scheme has been developed to study structural vibration properties
under external disturbance. The polarization diversity scheme has improved
signal-to-noise ratio (SNR) by over 13 dB with capability of detection frequency
of sub-hertz to tens of kilohertz. The minimum dynamic strain we have detected
is 3 nε, and
the SNR of the sensor is > 37
dB without any averaging. For the first time, Rayleigh backscattering has
been utilized to detect continuous and damped vibration generated by a piezo
fiber stretcher and vibrating cantilever with a frequency range of sub-hertz
to 16 kHz. We also use this sensor and polarization analyzer to characterize
the polarization state change and phase shift of the piezo fiber stretcher
in transmission and Rayleigh backscattering up to kilohertz frequency, both
results agrees quantitatively.
© 2008 IEEE
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