为实现高精度识别功能,基于Mach-Zehnder光纤传感器建立光纤入侵行为识别系统。引入多元回归统计原理, 建立常用信号特征参量与设定因变量之间的多元回归方程。通过逐步引入校验方法,验证回归模型的显著性校验, 实现特征的优化选取。利用选取的有效特征,构造基于感知准则的入侵行为识别系统。实验证明基于多元统计原理的 入侵行为识别系统具有良好的识别准确率,且识别准确率达到83.33%。

在光纤布拉格光栅法布里珀罗干涉式（FBG FPI）传感器的实验研究和工业应用中，其灵敏度一直受到广泛关注。在考虑光源线宽的情况下，推导出了其灵敏度的理论表达式，讨论了光源相干长度、法布里珀罗（F-P）腔腔长及光栅反射率对灵敏度的影响，指出腔长与光源相干长度比值越小，灵敏度越高；在腔长与光源相干长度比值一定时，存在一个最佳反射率使灵敏度达到最大。最后通过不同腔长的灵敏度对比实验和不同反射率的灵敏度对比实验，验证了理论仿真结果的正确性。

基于对Sagnac干涉仪在外界瞬变信号影响下响应特性的理论分析，提出了一种基于光纤Sagnac干涉仪的非接触式测量技术.针对陷波波形的特性，提出了相应的解调技术.实验结果表明，基于Sagnac干涉仪的非接触式测量技术不仅能识别瞬变信号，同时能实现对信号源的良好定位，相对定位准确度达到1.5%.

The mode-spacing of the fiber Bragg grating Fabry-Perot (FBG F-P) cavity is calculated by using the effective cavity length which contains the effective length of the FBG. The expression of the effective length, defined by using the phase-time delay, is obtained and simplified as a function of the peak reflectivity at the Bragg wavelength, the band edges, and the first zero-reffectivity wavelength. The effective length is discussed from the energy penetration depth point of view. Three FBG F-P cavities are fabricated in order to validate the effective length approach. The experimental data fits well with the theoretical predictions. The limitation of this method is also pointed out and the improved approach is proposed.