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Article overview
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Modulated Pulses Based High Spatial Resolution Distributed Fiber System for Multi-Parameter Sensing | Jingdong Zhang
; Tao Zhu
; Huan Zhou
; Yang Li
; Min Liu
; Wei Huang
; | Date: |
1 Sep 2016 | Abstract: | We demonstrate a hybrid distributed fiber sensing system for multi-parameter
detection. The integration of phase-sensitive optical time domain reflectometry
({Phi}-OTDR) and Brillouin optical time domain reflectometry (B-OTDR) enables
measurement of vibration, temperature and strain. Exploiting the fast changing
property of vibration and the static property of temperature and strain, the
laser pulse width and intensity are modulated and then injected into the
single-mode sensing fiber proportionally, so that the three concerned
parameters can be extracted simultaneously by only one photo-detector and data
acquisition channel. Combining with advanced data processing methods, the
modulation of laser pulse brings additional advantages because of trade and
balance between the backscattering light power and nonlinear effect noise,
which enhances the signal-to-noise ratio, and enables sub-meter level spatial
resolution together with long sensing distance. The proposed method realizes up
to 4.8 kHz vibration sensing with 3 m spatial resolution at 10 km standard
single-mode fiber. And measurements of the distributed temperature and stress
profile along the same fiber with 80 cm spatial resolution are also achieved
concurrently. | Source: | arXiv, 1609.0073 | Services: | Forum | Review | PDF | Favorites |
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