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Design and application of fiber Bragg grating (FBG) geophone for higher sensitivity and wider frequency range
Affiliation:1. Key Laboratory of Optical Fiber Sensing Technology of Shandong Province, Laser Institute, Shandong Academy of Science, Jinan 250014, China;2. China Yankuang Group, No. 298, Fushan South Road, Zoucheng 272102, China;3. Shandong Micro-Sensor Photonics Ltd, Jinan 250014, China;1. National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, China;2. School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China;3. Fuzhou University, Fuzhou 350108, China;4. School of Science, Wuhan University of Technology, Wuhan 430070, China;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China;2. State Key Laboratory of Operation and Control of Renewable Energy and Storage System, China Electric Power Research Institute, Beijing, 100192, China;3. State Grid Jiangxi Electric Power Research Institute, Nanchang, 330096, China;1. School of Physics, Northwest University, No.229, Taibai Road, Xi’an 710069, China;2. Ministry of Education Key Laboratory on Photoelectric Oil-gas Logging and Detecting, Xi’an Shiyou University, Xi’an 710065, China
Abstract:The fiber Bragg grating geophone sensor with higher sensitivity and wider frequency range was reported. The methods to increase the sensitivity of the FBG cantilever sensor were presented. The acceleration sensitivity of the optimized FBG geophone is 220 pm/g, and the resonant frequency can reach to 295 Hz. The experiments show that the FBG geophone system has the minimum detectable acceleration of 1 mm/s2. Some factual application examples of using this fiber Bragg grating geophone monitoring system for micro seismic monitoring in coal mine were presented.
Keywords:Fiber Bragg grating  FBG  Geophone  Acceleration sensor  Sensitivity
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