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近年来,对地声信号的探测技术在石油天然气勘探、地面和近海岸安全警界、海洋远距离目标探测和地下管道监测等领域得到飞速发展。为实现对低频地声信号的高品质探测,设计了一种双光栅对称推挽式结构的光纤布拉格光栅地听器,进行了结构理论、仿真分析、优化设计和三维结构扩展的研究。结果表明,该结构地听器具有较高的灵敏度,可达765.6pm/g;在1～120Hz之间,灵敏度动态响应特性良好;具有温度自补偿功能和较好的方向性;能够方便的扩展到三维结构;具有较好的对低频地声信号探测性能力。
In recent years, the sound signal detection technology has gained rapid development in such fields as oil and gas exploration, ground and coastal police, ocean long-range target detection and underground pipeline monitoring. In order to realize the high-quality detection of low-frequency acoustic signals, a double-grating symmetrical push-pull fiber Bragg grating is designed to study the structure theory, simulation analysis, optimization design and 3D structure expansion. The results show that the structure of the listener has a high sensitivity, up to 765.6pm / g; between 1 ~ 120Hz, the sensitivity of the dynamic response is good; with temperature self-compensation and good direction; can be easily extended To three-dimensional structure; with good low frequency sound signal detection capability.