Journal ArticleDOI
On-line writing identical and weak fiber Bragg grating arrays
TLDR
In this paper, the phase mask technique was used for on-line writing identical fiber Bragg grating (FBG) arrays using the phase masks technique and the results showed that the FBG arrays obtained in the optimal process (drawing speed of 12 ± 0.15 m/min and average tension of 38.2 g) have a central wavelength bandwidth of less than 0.1 nm and an average reflectivity of 0.26%.Abstract:
We investigate the on-line writing identical fiber Bragg grating (FBG) arrays using the phase mask technique. Given the limitation of laser power, the energy density uniformity and the horizontal width of the writing spot cannot be further optimized. The results show that the FBG arrays obtained in the optimal process (drawing speed of 12 ± 0.15 m/min and average tension of 38.2 g) have a central wavelength bandwidth of less than 0.1 nm and an average reflectivity of 0.26%. Thus, the phase mask method is a promising alternative for on-line writing identical FBG arrays.read more
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Journal ArticleDOI
Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings.
TL;DR: The results show that this system can well demodulate distributed acoustic signal with the pressure detection limit of 0.122Pa and achieve an acoustic phase sensitivity of around -158dB (re rad/μPa) with a relatively flat frequency response between 450Hz to 600Hz.
Journal ArticleDOI
A time- and wavelength-division multiplexing sensor network with ultra-weak fiber Bragg gratings
TL;DR: The low insertion loss and the high multiplexing capability of the proposed sensor network were investigated through both theoretical analysis and experimental study, which make it an excellent candidate for the large-scale sensing network.
Journal ArticleDOI
Improved Φ-OTDR Sensing System for High-Precision Dynamic Strain Measurement Based on Ultra-Weak Fiber Bragg Grating Array
TL;DR: In this article, an ultra-weak fiber Bragg grating array has been proposed to generate strong and controllable reflections while providing acceptable insertion loss in phase-sensitive optical time-domain reflectometry (Φ-OTDR).
Journal ArticleDOI
A Novel Interrogation System for Large Scale Sensing Network With Identical Ultra-Weak Fiber Bragg Gratings
Chenyuan Hu,Hongqiao Wen,Wei Bai +2 more
TL;DR: In this article, a novel interrogation system for large scale sensing network with identical ultra-weak fiber Bragg gratings (FBG) is proposed, theoretically analyzed and experimentally studied, based on time-division multiplexing (TDM) technique, two semiconductor optical amplifiers are introduced to the interrogation system to achieve fast and flexible demodulation.
Journal ArticleDOI
Novel polyimide coated fiber Bragg grating sensing network for relative humidity measurements.
TL;DR: A novel relative humidity (RH) sensing network based on ultra-weak fiber Bragg gratings (FBGs) is proposed and demonstrated and Experimental results show that the corresponding RH sensitivity varies from 1.134 to 1.832 pm/%RH when ambient environmental RH changes.