Abstract
A passive, interferometric wavelength demodulation technique has been
extended to measure the absolute wavelengths of a multiplexed array of fiber
Bragg grating sensors. The scheme retains its original strain resolution of
10
${\rm n}\varepsilon/\sqrt{\rm
Hz}$
. A proof-of-concept interrogation system was able to
determine the absolute wavelength of Bragg peaks to within 20 pm (17
$\mu\varepsilon$
).
Static and dynamic Bragg grating strains were accurately demodulated in both
absolute and relative wavelength measurement modes. This demonstration indicates
that interferometric techniques are able to provide absolute, static and dynamic
measurements of strain within a single platform.
© 2013 IEEE
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