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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...
This paper presents a fully distributed fiber acoustic sensing (DAS) system. Combined with the phase-sensitive optical time domain reflectrometry (Φ-OTDR) technology and phase generated carrier (PGC) demodulation technology, the system can detect and acquire seismic wave signal in real time. The system has a 3.05dB flatness of frequency response from 5Hz to 1kHz, which with sampling interval of each...
In this paper we report the fiber optic ocean bottom seismograph (FOBS) system which is promising to be installed in the Ocean Bottom Observation Network (OBON). The FOBS system consists of an ocean bottom seismometer and a demodulator. The fiber laser sensors are used in the seismometer to detect the seismic signal. There are four sensors, three fiber laser accelerometers (FLA) and one fiber laser...
This paper presents a high performance distributed feedback fiber laser sensor array system. The system adopts PGC-based interferometric wavelength shift demodulation technique and wavelength division multiplexing technique. A strain resolution of 305 fε/√Hz (@ 1 kHz) and the multiplexing of eight channels have been achieved.
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...
We describe a distributed feedback fiber laser (DFB FL) sensor system with ultra-high resolution. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced...
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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