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提出了一种新型强度调制型光纤传感器的理论模型。该模型使用单模光纤,讨论了光在准直透镜中的传播规律,利用光学透镜的准直作用,即矩阵光学原理和高斯耦合理论实现光强调制。强度型光纤传感器采用微电机系统MEMS结构的压力振动膜片拾取振动位移,通过分析施加在膜片上压力的变化及膜片尺寸得到影响双光纤位移传感器灵敏度的相关参数。仿真结果表明:合理的选择参数可以使传感器的灵敏度在不增加结构复杂性的前提下较传统方法有103量级的提高。
A new theoretical model of intensity-modulated optical fiber sensor is proposed. The model uses single-mode fiber to discuss the propagation of light in the collimating lens. The collimation of optical lens, that is, the principle of matrix optics and the Gaussian coupling theory, is used to realize the light intensity modulation. The intensity type optical fiber sensor adopts the vibrating diaphragm of the MEMS vibrating diaphragm to pick up the vibration displacement. By analyzing the change of the pressure exerted on the diaphragm and the size of the diaphragm, the parameters influencing the sensitivity of the dual optical fiber displacement sensor are obtained. The simulation results show that the reasonable choice of parameters can make the sensitivity of the sensor increase 103 orders of magnitude compared with the traditional method without increasing the complexity of the structure.