红外热像技术及其应用的研究进展

论述了红外热像技术及其在温度(场) 测试方面的特点,红外热像设备的研究发展历程 及国内外的最新进展。对红外热像技术在材料或构件的无损检测与评价,电力和石化设备的状态热诊断,构(建) 物的状态检测与节能评测,电子元器件、PCB 板及整机的自动测试,地震、岩爆等自然灾害防治等方面的国内外应用研究进展的情况进行了简要评述,并展望了红外热像技术的应用前景。     

涂层疲劳寿命预测中的红外热像技术应用现状

红外热像技术是一种重要的无损检测技术,与传统的无损检测技术相比优势明显。本文从热喷涂层接触疲劳失效形式出发,综述了传统无损检测技术在涂层疲劳寿命预测研究中的应用现状,以及红外热像技术在涂层服役状态、厚度、缺陷检测等领域的应用实例。同时,综述了融合红外热像技术的信息融合技术在复合材料疲劳极限确定、材料结构健康诊断、裂纹监测等领域中的应用现状。指出了这种技术存在的问题及面临的困难,并对信息融合技术在热喷涂层接触疲劳寿命预测中的应用与研究进行了展望。     

红外热像仪在陶瓷工业中的应用

介绍红外热像仪在陶瓷坯体烧成过程中温度场分布的动态测试，陶瓷坯体在烧成过程中变形与温度变动的关系，陶瓷坯体的红外热像无损检测，以及窑炉设备监控及故障诊断等方面的各种应用。     

加热炉炉墙衬里损伤的红外热像检测与评估

炉墙衬里的损伤程度往往决定了加热炉设备的寿命,因此,对这类设备衬里损伤实现在线与快速检测与评估是重要的工程问题.通过对某加热炉BA301炉墙进行红外热像检测与评估,表明红外热像检测技术应用于加热炉炉墙衬里性能评估及炉管保温评价等方面具有明显的的优越性,其应用将会越来越广泛.     

红外热成像技术在设备维护中的应用

红外热成像技术在工业检测中应用广泛。本文介绍了红外测温原理，讨论了电力设备的发热原理，过热损耗的危害，热像测温的影响因素等，并结合实际应用介绍红外热像设备预测性维护过程。     

我国红外热像检测技术的研究及发展展望

红外热像技术具有检测速度快、非接触、精度高、范围广、易于实现自动化和实时观测等优点,目前是非接触式检测领域的研究热点之一。为了更好地了解我国红外热像技术的研究情况,该文通过检索CNKI网中我国近十年来有关红外热像技术的研究文献,对该领域的研究成果及未来发展方向进行了总结和分析。目前我国红外热像技术的研究可分为基础研究、产品研发、应用研究等三个方面。其中红外热像的技术开发研究、红外图像分析处理、测温精度影响因素、红外热像仪新产品的开发以及其在军事、医疗、电力、农林业等领域的应用等方面的研究极具潜力,应用前景广泛。     

红外热像测温技术及其应用研究

阐述红外热像测温技术的工作原理和红外热像仪的基本组成,综述了红外热像仪测温技术的发展,从技术层面剖析了红外热像仪测温存在的问题,介绍了国内外在红外热像测温技术方面的研究热点,例举了利用红外热像仪进行温度场测量的应用实例,同时展望了未来的发展方向.针对红外测温领域中的理论、仪器及应用进行了较为详细的分析和总结.     

红外热像检测技术的发展和研究现状

红外热像检测具有非接触性、实时性、测温范围广、无测温热惯性、测量结果直观形象等优势,得到各工程领域的青睐,广泛应用于设备故障、材料缺陷等的在线检测诊断。本文回顾和总结了红外热像检测技术国内外的发展和研究现状,展望了其未来的发展趋势。     

红外热像技术在供暖散热器故障检测中的应用

供暖散热器在运行状态时会出现各种故障,需要寻求一种在线快速检测技术.通过建立供暖散热器传热模型,分析了红外热像仪检测散热器故障的可行性.在供暖散热器故障模式分类的基础上,选取典型供暖散热器故障红外热像图,采用热像特征、相间(或横向)互比和同相(或纵向)比较相组合的分析比较判别法对其红外热像特征进行分析,结合散热器的结构、运行状况和安装工艺等情况,开发了供暖散热器故障在线检测技术.     

红外热像仪测温技术发展综述

综述了红外热像仪测温技术的发展,从技术层面剖析了红外热像仪测温存在的问题,介绍了国内外在红外热像测温技术方面的研究热点,同时展望了未来的发展方向.针对红外测温领域中的理论、仪器、标定及应用四大方向进行了较为详细的分析和总结.     

混凝土结构物与植物叶片之红外热像侦测研究

红外热像仪准确量测温度的主要关键为物质的发射率.红外热像仪常用于战区侦测,但战区目标物常以植物绿化达到伪装效果.为此基于能量平衡法则,建立叶片发射率仿真模型,可用以估算叶片发射率.另外以红外热像仪分析±0.5℃微小温差环境中混凝土结构物与植物叶片之红外热影像,实验结果显示两种目标物红外热像平均温度与红外热像仪发射率参数设定值的回归直线相当接近,但两种目标物平均温度标准误差与红外热像仪发射率参数设定值的回归直线明显不同.混凝土与叶片具有不同的红外热像性质,此一发现将有助于提升红外热像仪对微小温差目标区的侦测能力.     

脉冲相位法用于复合材料层析检测的研究

为了提高脉冲热像无损检测技术对复合材料缺陷的检测能力，研究了脉冲相位法用于复合材料层析检测的可能性。介绍了利用脉冲相位法对脉冲热像图进行数据处理的原理，进行了CFRP层板的脉冲相位法检测实验，并从传热学角度对实验结果进行了分析。实验证明脉冲相位法用于复合材料的层析检测是可行的。     

An Analysis of Minimally Perturbing Temperature Probe and Thermographic Measurements in Microwave Diathermy

Temperature measurements in fat-muscle phantoms using thermography and a minimally perturbing temperature probe were investigated. Two microwave applicators (915- and 2450-MHz) were used to induce the heating in the phantom. Discrepancies between data taken with the thermographic camera versus the probe were measured. These discrepancies were shown to be primarily caused by a 40-s time delay in performing temperature measurements with the thermographic camera, which resulted in additional thermal diffusion in the phantom.     

Detection of foreign bodies in food by thermal image processing

This paper deals with the problem of detection of foreign bodies in food. A new method for inspecting food samples is presented, using thermographic images to detect foreign bodies that are not detectable using conventional methods. At first, the basic background of thermography is given. Then, experiments to obtain well-contrasted thermographic images of different food and foreign bodies are discussed. The main part of the present paper introduces specific image processing methods that show a good recognition power of foreign bodies within food. Results achieved with a small set of test images are presented. The results are promising and the methods work even on some poorly contrasted images. To compare the different image processing and recognition methods, a quality index is defined. On the test images the success of the presented methods is shown and the difference in recognition results can be measured using the introduced quality index.     

Integrated micro-Raman/infrared thermography probe for monitoring of self-heating in AlGaN/GaN transistor structures

Self-heating in AlGaN/GaN device structures was probed using integrated micro-Raman/Infrared (IR) thermography. IR imaging provided large-area-overview temperature maps of powered devices. Micro-Raman spectroscopy was used to obtain high-spatial-resolution temperature profiles over the active area of the devices. Depth scans were performed to obtain temperature in the heat-sinking SiC substrate. Limitations in temperature and spatial resolution, and relative advantages of both techniques are discussed. Results are compared to three-dimensional finite-difference simulations.     

医用红外热像仪在乳腺疾病普查中的应用研究

对医用红外热像仪在医学上应用的物理基础、乳腺疾病普查中热图的拍摄方法、乳腺热图的分类、以及分析乳腺热图与临床诊断关系的一般原则方面进行了讨论     

激光熔丝增材制造温度场的红外热像监测

为实现对增材制造成形件的精确控形控性，必须要对其热过程有一定科学认识。以真空环境下激光熔丝增材制造单道成形为例，利用红外热像技术对其热过程进行监测。比较分析送丝速度对温度场、热循环、冷却速率的影响规律，利用红外热分析对其成形熔敷道宽度及缺陷开展研究。结果表明:借助红外热像可实现对熔敷道温度场变化的监测，沿熔敷道长度成形方向，监测点对应最高温度和冷却速率分别呈现升高和降低趋势。随着送丝速度的增加，熔敷道长度1/4、2/4、3/4处监测点对应的冷却速率随之减小。此外，基于红外热分析可实现对熔敷道宽度预测以及对缺陷位置的定位。     

热成像技术在冷壁加氢反应器热故障识别中的应用

本文通过红外热像的测试，结合设备结构特点，对冷壁加氢反应器的裂纹、减薄及剥落等故障的热特性进行了分析与识别，获得的热像特性可供同类设备参考。     

Visualization of dynamic subcutaneous vasomotor response bycomputer-assisted thermography

Infrared thermography is a noninvasive and nonionizing imaging modality which detects thermally significant subcutaneous blood vessels as linear heat patterns projected onto the skin surface. In clinical thermography, pseudo-colors are typically used to represent isothermal regions. However, pseudo-colors destroy the connectivity of vascular patterns since the intravenous temperature of a subcutaneous blood vessel varies along its length. This representation also confounds estimates of vessel boundary location since boundary information is rendered by temperature gradients, and not by isotherms. This paper describes two computer-assisted methodologies for the visualization of peripheral subcutaneous vasomotor events. The first approach, which utilizes a three-stage segmentation strategy based on edge detection, can visualize temperature differences of approximately 3.5 degrees C between the subcutaneous vessel boundaries and surrounding tissue. The second approach requires user interaction with an adaptive filtering algorithm that selectively enhances vascular patterns in the thermogram while decreasing background noise artifacts. The user interactively selects decision thresholds used by the algorithm to develop symbolic, axiomatic models of homogeneous and bimodal local contrast regions. The result of this trained filter is then employed in a technique called digital subtraction thermographic venography for the extraction of subcutaneous venous patterns. This second approach shows less ambiguity and higher sensitivity than the edge detection approach in resolving subtle temperature differences of approximately 1.2 degrees C between the vessel and surrounding tissue. Computer-processed frames from both of these approaches are used for the dynamic visualization of normal and pathological vasomotor responses to thermal challenges, thereby providing diagnostic visual cues which are unavailable in the original thermograms.