Publication: High-resolution absolute-distance measurements using multiple-tunable fiber Bragg gratings
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MICYT//TIC2003-00909
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We present and demonstrate a high-resolution absolute-distance measurement system based on multiple-wavelength interferometry. The information on a cavity length is obtained by sampling a fringe of its spectral response at different wavelengths. This is achieved by simultaneously tuning multiple fiber Bragg gratings. For a two wavelength system, an unambiguous measurement range of 262 tm was obtained with a resolution of 14.3 nm.
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