距离对红外热像仪测温精度的影响及校正方法研究

分析了距离对红外热像仪测温精度的影响,建立实验系统并对测量的实验结果进行了分析.实验结果表明目标与红外热像仪之间的距离对测温精度有一定的关系,最后通过matlab对实验数据进行拟合,从而为实现校正提供了依据.     

基于红外技术的复合烧结多孔砌块墙体热工性能研究

采用红外热像仪法对复合烧结多孔砌块墙体进行热工性能的测试。相关计算得出墙体的传热系数,并且将其热工参数值与由理论计算方法和热流计法得出的墙体热工参数值进行对比分析．结果表明,红外热像技术法测试得出墙体的传热系数值与采用热流计法检测墙体传热系数值基本相同,并且与理论计算值相差不大．验证了红外热像仪法应用于围护结构热工性能检测和能耗分析的可行性。从而为围护结构热工性能的检测提出便利快捷的方法,也为建筑围护结构热工性能的定量和定性的分析提供重要的参考价值．     

红外热成像无损检测系统建立与试验分析

介绍了红外热成像无损检测的原理,分析了主动式红外检测技术中激励光源光谱特性对试验效果的影响,利用CEDIPJADE红外热像仪与IR928红外热像仪采集红外图像序列,并以此为基础建立了红外热图像无损检测系统,开发了红外图像序列处理软件系统.试验结果表明,建立的红外无损检测系统及图像序列处理软件系统能达到国外同类技术水平.     

枪用激光指示器多参数检测系统校正方法

针对某型激光指示器多参数检测系统的校正,提出了一种基于自准直原理,同时辅助前置镜、高精度光电经纬仪和激光指示器等设备完成整套系统的校正方法,并对校正后的系统进行了精度标定实验,实验结果表明,校正后的检测系统测量精度可达0.1%,远高于该型产品的检测精度要求。     

车用红外热成象仪中光学系统性能的考虑

本文论述了在红外光学系统设计中, 应首先考虑红外热成象仪总体性能与红外光学系统性能参数的关系, 依据这种复杂约束关系, 选择合理的光学性能参数, 才能在确保仪器总体性能的前提下, 最大限度地减少光学设计的难度。     

高性能工业检测型红外热像仪

广州飒特公司推出的高性能工业检测型红外热像仪——SAT—HY6800,其性能、功能达到或接近国际先进水平,是我国民用红外热成像设备的一次重大突破,并在     

德胜坝泵站现场测试与分析

采用LMSSCADASIIL／Rst．Lab系统和对红外热像仪等先进设备对德胜坝泵站进行现场测试,对测试成果进行分析．表明德胜坝泵站机组装置效率低下,闸门无法正常关闭,机组设备运行状态差,建议对泵站机组设备进行更新改造．     

基于温差电效应回收发动机废气余热的研究

通过理论分析、数值模拟与实验方法对基于温差电效应的发动机废气余热回收系统进行了系统的研究。用所搭建的单片温差发电器件（TEG）实验平台,对选用的TEG性能进行了测试实验。设计了用于发动机废气余热回收的热电系统单元,并对其性能进行了测试实验研究。根据CFD软件计算的发动机排气管流动与传热特性结果,分析了该热电回收系统在某发动机整个排气管上应用的收益情况,结果表明：在发动机标定工况下,总输出功率提高2.9%,燃油消耗率降低2.8%。     

红外热像增强算法发展研究综述

红外热像技术因具有检测效率高、对被测目标无影响、检测结果形象直观等优点而得到广泛应用.但在红外热像仪硬件、被测对象表面状况及检测环境等因素的影响下,实际成像质量或许达不到理想水平,从而影响后期关键信息的识别和提取.红外热像增强算法可在一定程度上改善成像质量,削弱红外热像不利因素的影响.传统的红外热像增强算法主要分为两大...     

汽车行驶跑偏测试系统中标定架的设计

为保证汽车行驶跑偏测试系统的测试精度,运用理论与实验相结合的方法设计标定架以校正CCD图像传感器的安装误差和统一多个传感器的物理坐标;通过研究标定算法与控制点关系,分析控制点分布对标定误差的影响,确定控制点的维数与分布;以尺寸链计算来合理分配标定架各构件公差,保证控制点位置精度,并研讨了再次标定控制点位置精度与首次标定一致性问题。试验证明,设计完成的标定架充分满足系统精度要求和使用要求。     

红外热像仪综合性能的客观评价及实现技术

为了改进红外热像仪综合性能指标的适用性并减小视觉感知引入的检测不一致性,研究了TOD检测方法及其机器视觉实现技术.针对MRTD方法在评价凝视阵列热像仪综合性能时的局限性,分析了TOD检测方法对凝视阵列热像仪动态场景检测、动态非均匀性校正等技术的适用性,通过在成像观测环节用人类视觉传递函数及心理认知模型取代人类视觉观测过程,用模糊函数抽取模拟热像仪信道模糊过程,用几何模板匹配取代视觉认知过程,实现了TOD指标检测过程的客观化.采用TOD检测方法可将热像仪综合性能指标的测量不确定度由±20%改善到8%,采用几何模板匹配过程实现机器判读时可进一步减小约1/2.采用TOD指标及机器视觉实现方法可有效提高凝视阵列热像仪综合性能指标的适用性和一致性.     

Calibratio performance evaluation of the spaceborne hyperspectral CHRIS imager

The CHRIS (Compact High Resolution Imaging Spectrometer) is a new imaging spectrometer, carried on board a new space platform called PROBA (Project for On Board Autonomy). The satellite was successfully launched in October 2001 by the European Space Agency (ESA). CHRIS operates over the visible/near infrared band (400-1050 nm). It has five work modes and can reach a maximum of 62 spectral bands. In this research, atmospheric correction based on hyperspectral images was performed on CHRIS images by using the popular radiance transfer code ACORN (Atmospheric Correction Now) and empirical algorithms. ACORN was also used to evaluate the calibration performance of CHRIS by the retrieved spectra of typical vegetation and soil. As a result, the maize reflectance spectrum corrected by ACORN could characterize vegetation reflectance in the range of 498-750 nm, but gave a fairly large deviation beyond 750 nm, showing the deficiency of spectral calibration beyond 750 nm. The ACORN-derived soil reflectance decreased beyond 800 nm, which was quite inconsistent with field-spectrum measurement and showed that the calibration accuracy couldn't meet the requirements of ACORN for spectral and radiometric calibration within a certain spectral range. In addition, the stripes on the retrieved water-vapor content map indicated that the radiance-calibration performance of CHRIS is not perfect. As the first spaceborne hyperspectral imager of ESA, the calibration performance of CHRIS needs to be improved.     

热探测法监测岩石应力变化的实验研究

为了探测岩石在受力过程中温度的变化特征，用接触式测温仪对花岗岩和大理岩试件进行了单轴加压条件下的测温试验，同时用红外热像仪作为辅助监测．结果表明：在加载与卸载过程中都有温度的变化，并有一定的可逆性，即，加载升温，卸载降温；岩石在破坏前存在温度奇变点，温度变化能够显示岩石破坏的前兆信息，80％抗压强度附近是岩石破坏的临界前兆点；红外热图也可以显示出破坏前的温度异常．热探测法对于矿山岩体应力变化监测是实用和有效的．     

Infrared measurement of temperature field in coal gas desorption

In order to reveal the temperature change in coal gas desorption process, the temperature variation in coal gas desorption process under different particle sizes is analyzed with infrared thermal imager. The infrared video signals obtained by the experiment are processed with SAT. Then the infrared radiation signals are processed by EMD with Hilbert–Huang and the infrared radiation noise is effectively removed. The research results show that the desorption process, with the change of the temperature, is an endothermic process. The coal absorbs heat when the gas is desorbed and the temperature drops. The coal body temperature drop range is obviously related to coal particle size. The smaller the particle size is, the bigger the temperature drop becomes. The temperature variation curves in the process of coal gas desorption under different particle sizes are fitted, and they comply with the exponential function. The research results lay the theoretical and experimental foundation for non-contact prediction on working face of coal and gas outburst with infrared thermal image technology.     

Study on thermal infrared emission directionality over crop canopies with TIR camera imagery

In order to investigate directionality of thermal infrared emission from crop canopies, a wide-angle thermal video camera (INFRAMETRICS) equipped with an 80?FOV lens was mounted on a small aircraft and used to acquire thermal imagery along several different flight traces. Accordingly, multi-angle directional brightness temperatures were acquired at different view angles for individual pixel. The flight experiment was carried out from January 1997 to October 1997 over a 5 kmx5 km flat agricultural area, located near Avignon, southeastern France.This paper presents results from analyses performed using these data including instrument calibration, radiometric correction, atmospheric correction, temperature temporal adjustment, geometric matching and registration of images. Results are presented for different thermal infrared emission patterns of different surface types including bare soil, wheat, maize and sunflower at different growth stages.     

Study on thermal infrared emission directionality over crop canopies with TIR camera imagery

In order to investigate directionality of thermal infrared emission from crop canopies, a wide-angle thermal video camera (INFRAMETRICS) equipped with an 80° FOV lens was mounted on a small aircraft and used to acquire thermal imagery along several different flight traces. Accordingly, multi-angle directional brightness temperatures were acquired at different view angles for individual pixel. The flight experiment was carried out from January 1997 to October 1997 over a 5 km×5 km flat agricultural area, located near Avignon, southeastern France.This paper presents results from analyses performed using these data including instrument calibration, radiometric correction, atmospheric correction, temperature temporal adjustment, geometric matching and registration of images. Results are presented for different thermal infrared emission patterns of different surface types including bare soil, wheat, maize and sunflower at different growth stages.     

一种基于定标变积分时间的均匀校正算法

在靶场光学测量领域，地基红外辐射特性测量系统不仅承担对目标辐射特性测量工作，而且还要实现目标跟踪成像和实况记录。然而，现有红外焦平面在制造工艺上的缺陷，以及红外辐射测量系统的光学系统自身热辐射的不均匀性，致使图像存在严重的非均匀性。基于传统的非均匀性校正方法在红外辐射特性测量系统应用的局限性，提出一种基于定标变积分时间的均匀校正算法。为证实校正效果，基于600 mm的中波红外辐射测量系统进行验证。实验结果表明， 2.5 ms和3.0 ms下的原始图像非均匀度从3.69%降低至0.22%，证实所提算法具有良好的校正效果，有工程应用意义。     

天幕靶灵敏度标定方法研究

天幕靶探测灵敏度是天幕靶重要的性能指标,目前使用的天幕靶灵敏度标定方法和表征参数不能准确的表征天幕靶的灵敏度.分析了天幕靶的工作原理和灵敏度机理,给出了光学镜头参数、被测弹丸长度与灵敏度之间的关系公式,提出了一种用小口径弹丸标定灵敏度的方法,推导了倍弹径数标定修正公式.通过气枪弹试验验证,研究的标定方法可行,给出的倍弹径数对实际使用具有明确的指导意义.     

干涉型成像光谱仪在轨辐射定标技术应用

为提高干涉型成像光谱仪空间目标测量精度,降低传感器中各个探测元响应度差异,提升成像光谱仪在轨辐亮度测量准确性。提出了一种基于定标场反射率测量参数结合计算程序仿真与成像仪在轨测量数据比对的空间定标方法。首先在介绍高光谱定标概念的基础上,提出了不同光谱响应函数、不同场地条件下的高精度入瞳亮度计算方法;其次对干涉型成像光谱仪进行在轨相对辐射修正,校正传感器中各探测元相应度差异,利用反射率基法开展了在轨绝对辐射定标试验,针对可见光、近红外波段建立在轨辐射定标计算模型。解决了包括多种反射率场地、高精度测试区域指示的试验方案优化设计问题,实现了星载高分辨率干涉型成像光谱仪的在轨高精度定标。研究结果表明,采用该定标技术使成像光谱仪的在轨测量精度达到5%。此外,定标场地环境条件对模型计算精度有一定影响,大面积均匀场适合采用反射率基法,小面积均匀场则引入邻近像元效应进行计算,通过布设人工指示目标,可提高反射率测量数据的准确性。所采用的定标技术已获得工程应用。     

pc-LED双热源热模型实验研究

荧光粉转换型白光LED（pc-LED）的热模型是LED散热设计的基础。常用的单热源单通道热模型不能表达pc-LED的实际散热过程,已有的双热源双通道热模型的参数测量需要T3ster和红外热像仪,并忽视了环氧胶在蓝光LED照射下的发热现象。为此,文章提出一种采用PT100芯片直接测pc-LED芯片结温和微型热电偶直接测荧光粉温度的方法,并依据实验结果改进了双热源双通道热模型,计算出各热阻值和热流值,揭示了pc-LED的散热规律。实验还发现纯环氧胶在蓝光LED辐照下有发热的现象。