Abstract
An interrogation scheme based on wavelength-to-time mapping to achieve
ultrafast, high-precision, and large dynamic range interrogation of fiber
Bragg grating (FBG) sensors is proposed and experimentally demonstrated. The
wavelength-to-time mapping, also called temporal self-imaging effect, is
realized in the optical domain, using a dispersive element that has a large
group velocity dispersion. For a practical dispersive element, higher order
dispersions exist, which makes the wavelength-to-time mapping nonlinear.
Thus, an interrogation system based on wavelength-to-time mapping without
considering the high-order dispersion would reduce the interrogation
accuracy. In this paper, for the first time to the best of our knowledge, a
mathematical model that incorporates higher order dispersion to achieve an
accurate wavelength-to-time mapping is developed, which is then verified by
a numerical simulation. An FBG-based strain sensor interrogated based on the
developed wavelength-to-time mapping scheme is experimentally investigated.
The system has a sampling speed of 48.6 MHz, a dynamic range as large as
20nm, and a sensing accuracy as high as 0.87 $\mu \varepsilon$ for a single-shot measurement.
© 2010 IEEE
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