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A static-strain FBG-FPs sensor with high resolution based on empirical mode decomposition (EMD) and wavelet algorithm is proposed. The FBG-FPs are interrogated by a narrow-linewidth fiber laser which is driven by an optical single sideband (SSB-SC) modulator. Adaptive basis functions which are denoised by wavelet algorithm can be extracted from two FBG-FPs' reflection spectra by EMD. Adaptive basis...
Static-strain can be detected by measuring a cross-correlation of two FBG-based Fabry–Pérot interferometers (FBG-FPs). This letter addresses applying the wavelet transform to cross-correlation processing in noise-contaminated FBG-FP reflection spectrums for crust deformation measurement. Since the wavelet transform has a unique feature of varying time-frequency resolution, cross-correlation processing...
This paper presents the fundamental technique of PGC (phase generated carrier) and its realization on Compact RIO (Compact Reconfigurable Input and Output) which adopts real-time and FPGA (Field Programmable Grate Array) techniques. Improvement of the PGC technique is also introduced by using peak-to-peak value detection method to reduce the influence of variation of the light intensity. A four-element...
A novel fiber Bragg grating (FBG) sensor array system based on digital phase generated carrier (PGC) demodulation and reference compensation method is proposed and set up. Experimental results confirm that the digital PGC demodulation can be used for wavelength-division-multiplexed FBG sensor array and the reference compensation method can reduce the environmental interference by approximately 40...
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