薄膜型光纤F-P腔传感器弧形腔效应的补偿

Compensation of Diaphragm-Based F-P Fiber Sensor Due to the Arc-End Effect

摘要:

讨论并仿真了薄膜型光纤F-P腔传感器弧形腔效应的补偿。当一个薄膜型光纤F-P腔传感器的形变位移足够显著时,将产生弧形腔效应而使其不再完全服从平行平面腔传播模式规律。此时必须对平行平面腔的传播模式进行修正以符合弧形腔的实际规律。利用基尔霍夫衍射方程对弧形腔模型进行了计算和仿真,确定了弧形腔的散射效应,并基于一种典型腔长解调方法,提出了弧形腔效应下,腔长解调值的补偿方案。

Abstract:

The compensation of the diaphragm-based F-P fiber sensor due to the arc-end effect is discussed and simulated in this paper. The arc-end effect happens when the displacement of a diaphragm-based F-P fiber sensor is significant enough, making it impropriate to treat the diaphragm as a plane. Thus, the propagation pattern of the parallel plane cavity must be modified to conform to the actual law of the arc-end fiber sensor. The model of the arc-end cavity is calculated and simulated by using Kirhoff’s diffraction formalism and the arc-end scattering effect is determined. Also, the compensation method of the cavity length is presented based on a typical demodulation method.