Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 68, Issue 8, Pages 2964-2970Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2018.2871279
Keywords
Dynamic modal analysis; fiber Bragg gratings (FBGs); optical fiber sensors; spectrum analysis; vibration measurement
Funding
- FRGS [FP033-2017A]
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In this paper, we proposed a spectral interrogation scheme for the detection of small wavelength shift of fiber Bragg grating (FBG) accelerometer in a vibration test. Our findings indicate that the adopted upsampling procedure in the algorithm can effectively reconstruct small signals (wavelength shift < pixel resolution of diffraction grating-based interrogator) from low-resolution spectra that cannot be achieved by using other interrogation schemes. The reconstructed signals have good SNR and excellent coherence with the reference signal from a standard integrated electronic piezoelectric accelerometer in both time and frequency domains, as if they are extracted from the high-resolution spectra. The proposed method has opened a new possibility of employing low-cost FBG interrogation for accurate measurement and dynamic modal analysis in various industrial applications.
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