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High resolution instrumentation system for fibre-Bragg grating aerospace sensors |
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| Authors: | A. Ezbiri S. E. Kanellopoulos V. A. Handerek |
| Affiliation: | Department of Electronic and Electrical Engineering, King's College London, Strand, London WC2R 2LS, UK |
| Abstract: | A passive technique for high-resolution detection of the wavelength of peak reflection from fibre Bragg grating (FBG) sensors is presented. The approach, based on a de-convolution of the FBG spectrum and the spectrometer resolution, essentially overcomes the low spectral resolution (≈0.1 nm) associated with commercial spectrometers employing CCD detection. The performance of two algorithms, the Centroid Detection algorithm (CDA) and the least squares method (LSQ), are compared. The LSQ algorithm offers resolution enhancement of at least two orders of magnitude and is shown to be independent of the FBG intensity and bandwidth over a broad range. |
| Keywords: | Optical communication Diffraction gratings Fiber optic sensors Light reflection Spectrum analysis Algorithms Least squares approximations Bandwidth Charge coupled devices Fiber Bragg gratings (FBG) sensors Centroid detection algorithm (CDA) |
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