Multi-Wavelength Ultra-Weak Fiber Bragg Grating Arrays for Long-Distance Quasi-Distributed Sensing

Fiber Bragg grating (FBG) array,consisting of a number of sensing units in a single optical fiber,can be practically applied in quasi-distributed sensing networ...     

遥感图像大气校正方法综述

对目前常用的大气校正方法作了较详细的介绍，包括辐射传输模型法、黑暗像元法、不变目标法、直方图匹配法等8种方法。分析了各种方法的优缺点，以及它们各自的适用范围，并对各种方法在国内外应用的情况作了概括。     

遥感图像分类方法综述

从遥感图像分类方法的基本原理入手,介绍了传统遥感图像的分类一些方法,以及它们近年来的发展,此外还对遥感图像分类研究的新方向作了一些介绍,并对发展趋势作了展望。     

指针与数组的关系综述

从数组元素和地址的表示入手,介绍了列地址、行地址的概念,介绍了数组元素的多种表示方法,对数组和指针的关系予以了探讨。     

土壤定量遥感技术研究进展

分述了目前VIS/NIR地面光谱、多光谱和高光谱数据及分析技术在土壤定量遥感研究中的应用情况和进展,指出多源遥感数据的应用是该领域的主要趋势,并简要分析了目前研究中存在的问题。     

一种新型FBG微力传感器

设计并制备了一种新型微力传感器。将光纤Bragg光栅(FBG)用聚氨酯封装成柱状,将其一端固定在外壳底板上,另一端和杠杆的一端固定,通过杠杆原理起到对微力的增敏作用。当作用力在0~1.666 N变化时,该传感器的灵敏度为0.952 nm/N,是裸光纤拉力灵敏度的3.81倍。通过改变杠杆比例可以使该结构满足不同的测量范围和灵敏度。     

Visible Light-Illuminated Gold Nanohole Arrays With Tunable On-Chip Plasmonic Sensing Properties

Since the discovery of the extraordinary optical transmission phenomenon,nanohole arrays have attracted much attention and been widely applied in sensing.However,their typical fabrication process,utilizing photolithographic top-down manufacturing technologies,has intrinsic drawbacks including the high costs,time consumption,small footprint,and low throughput.This study presented a low-cost,high-throughput,and scalable method for fabricating centimeter-scale(1×2 cm2)nanohole arrays using the improved nanosphere lithography.The large-scale close-packed polystyrene monolayers obtained by the hemispherical-depression-assisted self-assembly method were employed as colloidal masks for the nanosphere lithography,and the nanohole diameter was tuned from 233 nm to 346nm with a fixed period of 420nm via plasma etching.The optical properties and sensing performance of the nanohole arrays were investigated,and two transmission dips were observed due to the resonant coupling of plasmonic modes.Both dips were found to be sensitive to the surrounding environment,and the maximum bulk refractive index sensitivity was up to 162.1nm/RIU with a 233 nm hole diameter.This study offered a promising approach for fabricating large-scale highly ordered nanohole arrays with various periods and nanohole diameters that could be used for the development of low-cost and high-throughput on-chip plasmonic sensors.     

光纤光栅金属基片式封装结构及其温度传感特性研究

本文提出了一种光纤光栅金属基片式环氧树脂封装结构,分析了该结构封装光纤光栅的温度传感特性,并进行了实验研究,得出了温度传感灵敏度系数.研究表明该封装结构非常适合制作分布式光纤光栅温度传感器.     

遥感尺度选择问题研究进展

尺度效应是遥感应用分析中的一个重要因素,直接影响遥感分析的效果.遥感尺度选择问题已经引起国际遥感界的高度重视.本文首先明确了遥感尺度选择问题的范畴;然后分析了当前遥感尺度选择的方法,并对已有的方法进行了评价;最后就遥感尺度选择的研究方向给出了一些建议.     

区域土壤盐渍化遥感监测研究综述

对国内外遥感监测土壤盐渍化发展情况作了介绍,对土壤盐渍化及其动态变化遥感监测方法进行了总结,数字图像处理将成为区域土壤盐渍化遥感监测研究的主要手段,土壤盐渍化是一个世界性的问题,应将遥感琢遥感图像处理的最新成果充分运用到盐渍土监测研究中,为盐渍土治理与农业可持续发展提供信息保障。     

无人机遥感发展与应用概况

在阐述无人机发展历程基础上,论述了无人机在遥感领域的应用理论发展以及在气象监测、资源调查、航拍测量和应对突发事件等方面的应用,归纳了目前无人机遥感研究存在的问题,展望了今后无人机遥感研究的热点和重点。     

区域干旱遥感监测模型研究进展

简要介绍应用遥感手段进行区域干旱监测的科学意义和应用价值,按照波段划分,将区域干旱遥感监测模型和方法归纳为热红外、可见光-近红外-热红外和微波三个部分,分析了目前的模型与方法中存在的问题和难点,应用遥感数据源反演地表参数带来误差及地面实验验证模型等需要解决的问题,最后对未来的工作和研究重点提出建议。     

RSID:一种面向遥感应用的数据库系统

遥感解译系统中，需要访问图像等非格式化数据并对大量不同来源数据进行融合处理。有必要建立面向遥感应用的数据库，对各类数据进行高效管理并方便用户的访问，为遥感解译提供数据支持。研究了面向遥感应用的数据库的体系结构，建立了“支持遥感图像解译的数据库系统”RSID，并针对kNN图像检索模型的局限性，引入了相邻图模型。     

机器人用传感器材料的进展

机器人用传感器材料分为半导体材料、陶瓷材料、有机材料和金属材料。本文简要介绍了几类传感器材料的特点、应用情况和发展前景。     

A Fuzzy Classifier for Tactile Sensing

In this paper we propose a fuzzy rule-based algorithm for solvingclassification problems related to tactile sensing. A tactile sensing systemis a robotic device which gives an image of contacting objects. While thefine form recognition problem has been widely discussed and severaltechniques have been proposed for its solution (Bayesian approach or Neuralalgorithms), less attention has been paid to the problem of deciding whetherthe object belongs to a particular class or set of objects that share acommon feature, also known as tactile primitive. As input data we considerthe sum of the normal stresses at the sensing sites. Three levels ofclassification, hierarchically connected, are analyzed and, for each level,different basis variables with their membership functions are proposed andcalibrated using a training procedure. The output is an answer regarding thefeatures of the object at each level and is related to the truth values ofthe fuzzy classes. The numerical experiences show that, at least for dataaffected by low noise level, the algorithm has a very high percentage ofcorrect answers.     

FBG温度传感的多路解调方法

提出了一种基于匹配光纤布拉格光栅的光栅温度传感新型多路解调方案,利用微机控制步进电机对多路匹配光栅施加压力和拉力从而与测量光栅匹配,达到对温度传感信号的解调。并对实验数据进行处理,建立了系统的响应特性模型。实验结果证明,该解调方法测量简单,重复性好,准确度较高。     

基于以太网的光纤传感信息远程监控系统设计

由光纤布喇格光栅(FHG)构成的光纤传感网络,在许多领域具有广泛的应用前景,日益成为国内外研究的热点.针对光纤传感信息集中处理、实时监测、远程控制等要求,提出一种基于以太网的光纤传感信息远程监控系统的设计.系统硬件设计部分采用基于DSP的F-P腔解调技术,软件设计主要采用VC++平台下的网络编程和数据库编程技术.     

Review of Femtosecond-Laser-Inscribed Fiber Bragg Gratings:Fabrication Technologies and Sensing Applications

Fiber Bragg grating(FBG)is the most widely used optical fiber sensor due to its compact size,high sensitivity,and easiness for multiplexing.Conventional FBGs fa...