共查询到18条相似文献,搜索用时 109 毫秒
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基于拉曼散射的分布式光纤温度传感技术的研究 总被引:3,自引:0,他引:3
论述了基于拉曼散射的分布式光纤温度传感器的基本工作原理、结构、系统特点及信号处理方法。该结构及信号处理方法具有一定的空问分辨率,保证了系统的实用性。将分布式光纤传感器与传统的复用温度光纤传感器阵列进行了比较。通过使用分布式光纤温度传感器信号处理系统和信号处理软件相结合进行实验,得出结论。 相似文献
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光纤技术用于飞机电源分布式控制系统中,有效解决了控制系统的电磁兼容、电气隔离、抗干扰等问题,大大提高了电源系统性能与可靠性。本文详细阐述了机载电源数字控制系统中光纤多路传输网络体系结构,介绍了多路复用传输的总线通讯协议;给出了光纤总线智能接口的电路设计;并对光纤总线网络的可靠性技术进行了讨论 相似文献
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光纤分布式数据接口是美国国家标准研究所开发的100Mbps局域网标准,它使用定量-令牌访问方法通过总长200公里的光纤能连接500个站。 相似文献
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分布式分牌传递网络将进入高速实时的航空电子通信系统。本文针对两种典型的令牌传递网络,即美国自动化工程学会(SAE)的线性令牌传递总线(LTPB)与美国国家标准协会(ANSI)的分布式光纤数据接口(FDDI)令牌环进行了各个方面的比较研究,最后给出了比较分析结论。 相似文献
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基于喇曼散射的分布式光纤测温系统光接收机灵敏度的分析 总被引:2,自引:0,他引:2
在分布式光纤测温系统中,携有温度信息的喇曼散射光是极其微弱的,只有 n W量级,而温度变化引起的喇曼散射光的变化更加微弱。在对光接收机噪声分析的基础上,给出了该类应用条件下光接收机信噪比。指出了低信噪比下,AD的量化误差将随累加次数的增加而减小,同时 AD的有效位数将增加,给出了低信噪比下 AD有效位数的分析方法,并通过 MATLAB进行了验证,在此基础上,分析了光接收机的灵敏度,由此可以直接计算分布式光纤测温系统的测温精度。 相似文献
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An overview of military avionics data buses and their applications, with the emphasis on optical fiber networking techniques. The evolution of military avionics data buses is discussed. The development trend actually reflects an increasing demand on such data buses, which requires the change from low-speed to high-speed transmissions, from single-rate to dual-rate operations, and from centralized control to distributed control. Recent progress in military avionics networks is described. 相似文献
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基于实时网络建立的半实物仿真系统能满足强实时性及高精度的要求,随着仿真应用技术的发展,需要参与半实物仿真的实物越来越多,由于共享内存光纤网络产品的飞速发展,如何用最新的实时网产品来扩展原有的实时网络系统是一个必须解决的关键问题。本文阐述了如何扩展的研究结果和实现方法。 相似文献
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《中国航空学报》2021,34(5):93-102
SiBCN and BN/SiBCN light-leakage-proof coatings were prepared on silica optical fibers for sensing applications at high temperatures. Scanning electron microscopy was used to characterize the surface morphology and microstructure of the coated fiber. Mechanical and optical properties of the coated fiber were characterized by Raman, optical and tensile tests. Compared with the original fiber, the tensile strength of SiBCN and BN/SiBCN coated fiber show an increase of about 60% and 90% at room temperature, respectively. In addition, the tensile strength of BN/SiBCN coated silica optical fiber was increased by about 42% at 700 °C. It has been found that the improvement of the strength of BN/SiBCN coated silica optical fiber is related to the healing of defects and residual compressive stress in fibers. From the light transmittance performance of the coated fiber, it was found that BN/SiBCN double coating could be an ideal total reflection solution to protect silica optical fiber from light leakage during high temperature sensing operation. 相似文献
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One of the stringent requirements on the receivers of distributed industrial fiber optic systems is fast and accurate adaptive thresholding and a wide dynamic range. This is due to the existence of variable link lengths and geometry, especially in multipleaccess situations, coupled with unipolar optical signaling. This paper analyzes the application of a simple spread-spectrum system in such fiber-optic data links. It proposes a detector model that yields a tractable expression for the probability of error. The optimum threshold and the probability of error are then related to the received optical power, bit rate, and spectrum-spreading factor. A procedure is indicated by which, based on the minimum expected received power, a spreading facor and a threshold are chosen to insure a given maximum error rate at all the receivers. 相似文献
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面向21世纪航空动力控制展望 总被引:46,自引:20,他引:26
本文展望了跨入21世纪之际航空动力装置控制系统的发展方向,在技术上将向数字、综合、分布、光纤、多变量、容错及智能控制等方向发展,其达到的效益是提高性能(推力或功率)、提高可靠性、减轻重量、降低耗油率。 相似文献
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针对基于应变测量的载荷分布反演,首先对比分析现有几种影响系数法,并讨论影响载荷反演精度的几个关键问题。为解决单位载荷工况选取的难题,提出一种基于施密特正交化的最大垂直距离逐步筛选基工况法,从设计载荷工况库中筛选载荷基工况和应变基工况,建立一套完整的工程可行的载荷分布反演流程。为解决反向矩阵病态化的难题,引入Tikhonov正则化方法。以某型飞机机翼疲劳试验作动筒载荷和光纤传感器数据为算例,假设3种应变测量误差情况(无误差、5%随机误差、10%随机误差),验证了提出的载荷分布反演方法具有很高的预测精度和鲁棒性,可为新一代航空航天器的结构健康监控提供一条可靠的载荷识别途径。 相似文献