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The microseismic (MS) monitoring in the coal mining provides a powerful method to identify the coal mine geological hazards as well as to prevent against the illegal mining. The challenge of MS monitoring is to extract characteristics of interest from the collected raw MS signals and locate the MS events using effective algorithms. In order to improve the localization accuracy of microseismic sources,...
A fiber Bragg grating (FBG) acoustic emission (AE) sensing model is established and the cosine-Gauss function is used to simulate the dynamic strain field along the FBG generated by AE waves. The theoretical simulations show that there is a regular relation between the characteristics of FBG reflection spectrum and the parameters of AE wave. In order to verify the simulation results, a FBG AE sensing...
This paper introduces a novel Brillouin signal detection method, including its basic principle and its advantages in a distributed fiber temperature and strain sensing system based on Brillouin scattering. The detection method relies on heterodyne detection which does not need an extra reference light, and has many special advantages compared with the interference detection method. Careful and detailed...
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