基于光学图像分析的目标伪装效果评估对于提高现役主战装备在战场上的生存能力有重要的指导意义, 是****领域中研究的热点问题之一。为了给目标探测与识别、伪装方案设计等相关领域研究学者提供参考, 对传统光学伪装效果评估模型、神经网络评估模型、基于人眼视觉注意机制模型以及多属性决策模型进行了介绍, 阐述了目前国内外典型评估方法的基本思路及应用, 分析了不同模型的特点和不足以及光学伪装效果评估面临的问题。在此基础上, 指出模型训练样本的获取和模型参数的自适应性以及运动目标伪装评估的时效性是未来伪装效果评估的研究重点。

为了使降维结果更好地体现高光谱数据的空间结构信息,并进一步提高分类精度,提出了一种基于线性嵌入和张量流形的高光谱特征提取算法。不同于其他流形结构的表达方法,所提算法采用协同表示理论求解全局线性嵌入的权重矩阵,更有利于保持高维数据的全局信息,提高了流形结构表达的准确性。同时,建立了基于多特征描述的张量流形降维框架,得到的显式映射具有较强的可靠性和全局适应性。实验结果表明:与主成分分析、局部线性嵌入、拉普拉斯特征映射和线性保留投影等算法相比,所提算法表现出了更优越的分类性能。

Fiber grating is a kind of new type of fiber optic light source device which has been rapidly changing in the refractive index of the core in recent years. Especially, it can realize the high precision of the external parameters by means of the special structure design and the encapsulation technology [1, 2]. In this paper, a fiber grating vibration sensor which is suitable for vibration monitoring in key areas is designed based on the technical background of vibration monitoring system. The sensor uses a single beam structure and pastes the fiber Bragg grating (FBG) to measure the vibration wavelength on the surface. When the vibration is simply harmonic vibration, the Bragg reflection wavelength will change periodically, and the periodic variation of the wavelength curve can be measured by the fiber grating demodulator, then the correctness of the experimental results is verified. In this paper, through the analysis of the data measured by the demodulator, the MATLAB software is used to verify the data, and the different frequency domains, the modes, and the phase frequency curves are obtained. The measurement range is 0 Hz – 100 Hz, and the natural frequency is 90.6 Hz.

In view of the problems such as the lower automation level and the insufficient precision of the traditional fiber optic gyroscope (FOG) static north-finder, this paper focuses on the in-depth analysis of the FOG dynamic north-finder principle and algorithm. The simulation model of the FOG dynamic north found algorithm with the least square method by points is established using Simulink toolbox, and then the platform rotation speed and sampling frequency, which affect FOG dynamic north found precision obviously, are simulated and calculated, and the optimization analysis is carried out as a key consideration. The simulation results show that, when the platform rotation speed is between 4.5 °/s and 8.5 °/s and the sampling frequency is at about 50 Hz in the case of using the parameters of this paper, the FOG dynamic north finding system can reach the higher precision. And the conclusions can provide the reference and validation for the engineering and practical of FOG dynamic north-finder.

In view of problems existing in the detection of the traditional hydraulic system, such as the large volume of sensor and the low measurement accuracy, a new one-piece target type flow sensor is designed and researched based on fiber Bragg grating (FBG). A compact structure is designed, which is convenient to be dismantled, processed, and installed, based on the analysis of the principle of FBG and the structure of target type flow sensor. The force of target put in fluid flow is turned into the FBG wavelength drift, with a corresponding relationship. The problem on the cross sensitivities of the temperature and strain is solved effectively by using double FBG symmetrically pasted on the both surfaces of the cantilever. The impact on the fluid state is analyzed through simulation in the software FLUENT, and the results show that the impact was smaller than that of the traditional structure. The results of experiments in the hydraulic system show that there is a good linear relationship between the change in the dual FBG central wavelength and mass loading on the target sheet has a good linear relationship, and the sensitivity is twice that of a single FBG sensitivity.

针对光纤布拉格光栅(FBG)准分布式传感解调系统进行了专门的研究。结合准分布式传感解调信息混杂、动态范围大等特点，自行搭建了FBG 传感解调系统。以实验室现有的复合传感器为平台，基于LabVIEW 软件，开发出一种适用于光纤光栅准分布式传感解调的测试平台，使得承载有温度、压力、流量信息的波长变化智能区分，并通过相应计算将被测物理量实时显示。通过实验，对温度、压力、流量传感器分别进行了标定，得出相应的计算参数；通过综合实验，系统分辨出了不同物理量的波长值并直接显示被测量，实现了高精度可视化实时显示的目的，验证了系统设计的可行性与可靠性。

针对传统流量测量中存在的测量灵敏度不高、测量参数单一，传感器体积较大等不足，提出一种基于光纤布拉格光栅（FBG）的多功能复合流量传感器。传感器以FBG差压式流量测量为结构主体，同时有机集成了FBG温度和压力传感器，从而实现对被测流体的流量、压力和温度的同时测量。在介绍FBG传感原理的基础上，分析了毛细钢管封装FBG温度传感器和盲管式FBG压力传感器的工作机理。同时，在分析差压式FBG流量传感器工作原理的基础上，介绍了FBG多功能复合流量传感器的结构和实现原理。分别采用水浴装置、压力表校验仪和综合流量测试台对多功能复合传感器中的FBG温度、压力和流量传感器进行了传感特性实验。测试结果表明，FBG温度传感器的灵敏度为0.015 nm/℃，FBG压力传感器的灵敏度为0.028 nm/MPa，FBG流量传感器的分辨率为0.068 L/s。同时，传感器的温度测量功能可作为参考，从而克服FBG压力及流量测量中的温度交叉敏感效应。

在分析压差式FBG(光纤布拉格光栅)传感原理的基础上, 采用液压校验仪和Q8384光谱仪对其静态压力传感特性进行了实验研究, 并对实验结果进行了误差分析。实验结果表明, 在0~0.35 MPa的压力范围内, FBG的灵敏系数为3 pm/kPa, 布拉格波长随着压差的变化呈现出良好的线性关系和重复性, 且迟滞现象较小, 可以用于液压系统的流量测量。