To achieve the monitor of rock burst in coal mine with fiber Bragg grating (FBG) sensing, the coupling mechanism between FBG and shock waves w<span style="font-family:;" "="">as</span...To achieve the monitor of rock burst in coal mine with fiber Bragg grating (FBG) sensing, the coupling mechanism between FBG and shock waves w<span style="font-family:;" "="">as</span><span style="font-family:;" "=""> theoretically analyzed. Based on Housner’s random shock model, the coupling mechanism between shock waves and FBG was theoretically analyzed. The result shows that the wave will change the period </span><span><span style="white-space:nowrap;">Ʌ</span></span><span style="font-family:;" "=""> and effective refractive index </span><i><span style="font-family:;" "="">n</span></i><span style="font-family:;" "=""> of FBG, and further affect the initial wavelength value. The amplitude, phase and frequency of shock wave are directly related to the wavelength drifts of FBG. The transmitting velocity of shock wave in rock is affected by lithologic characteristics. The Elastic modulus, density and Poisson’s ratio of rock influence the initial wavelength value of FBG. This study provided a theoretical basis and practical application guidance for coal or rock burst monitoring with FBG sensing.</span>展开更多
文摘To achieve the monitor of rock burst in coal mine with fiber Bragg grating (FBG) sensing, the coupling mechanism between FBG and shock waves w<span style="font-family:;" "="">as</span><span style="font-family:;" "=""> theoretically analyzed. Based on Housner’s random shock model, the coupling mechanism between shock waves and FBG was theoretically analyzed. The result shows that the wave will change the period </span><span><span style="white-space:nowrap;">Ʌ</span></span><span style="font-family:;" "=""> and effective refractive index </span><i><span style="font-family:;" "="">n</span></i><span style="font-family:;" "=""> of FBG, and further affect the initial wavelength value. The amplitude, phase and frequency of shock wave are directly related to the wavelength drifts of FBG. The transmitting velocity of shock wave in rock is affected by lithologic characteristics. The Elastic modulus, density and Poisson’s ratio of rock influence the initial wavelength value of FBG. This study provided a theoretical basis and practical application guidance for coal or rock burst monitoring with FBG sensing.</span>
