A directional spectral emissivity measurement device with built-in calibration radiation source

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-10-01 DOI:10.1016/j.ijthermalsci.2024.109454

Yang Wang , Jingmin Dai , Yufeng Zhang

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引用次数: 0

Abstract

Infrared emissivity is a fundamental parameter that characterizes the thermal radiation of materials, and has a large number of measured needs in the fields of aerospace, nuclear power generation, solar energy utilization, and building energy conservation. Based on the principle of Fourier transform spectrometer, a high-temperature directional spectral emissivity measurement device was constructed using an interferometer module, liquid nitrogen cooled HgCdTe (MCT-LN) detector, and infrared focal plane array (IRFPA) detector. The device was designed with a built-in calibration radiation source, which can timely correct the stored calibrated black body data at multiple temperature points based on the changes in detector spectral responsiveness, breaking away from the dependence of traditional measurement devices based on energy comparison method on the bulky and cumbersome black body, and providing technical exploration and application possibility for the field application of high-temperature emissivity measurement devices. In addition, the focal plane detection that can achieve synchronous thermal imaging function is applied in the device, which is beneficial for the optical path alignment and heating state discrimination of the target to be measured. In the experiment, the emissivity values of GH5188 superalloy from 473 K to 1473 K after heat treatment were proportional to the temperature change, and the total hemispherical emissivity values increased by 0.204. The total directional emissivity of 0–60° changed slightly, but decreased sharply at 60°. The measured data were compared with data from published literatures, at the same temperature, the maximum deviation in spectral emissivity values for SiC material 316 L stainless steel material is 0.044 and 0.022 and the comparison results showed satisfactory consistency. Through uncertainty analysis, the results indicate that the combined uncertainty of the measuring device was less than 2.6 %.

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内置校准辐射源的定向光谱发射率测量装置

红外发射率是表征材料热辐射的基本参数，在航空航天、核能发电、太阳能利用、建筑节能等领域有着大量的测量需求。根据傅立叶变换光谱仪的原理，利用干涉仪模块、液氮冷却碲化镉汞（MCT-LN）探测器和红外焦平面阵列（IRFPA）探测器，构建了高温定向光谱发射率测量装置。该装置设计了内置校准辐射源，可根据探测器光谱响应度的变化，对存储的多温度点校准黑体数据进行及时修正，摆脱了传统测量装置基于能量比较法对笨重黑体的依赖，为高温发射率测量装置的现场应用提供了技术探索和应用可能。此外，该装置还应用了可实现同步热成像功能的焦平面探测，有利于光路对准和待测目标的加热状态判别。在实验中，热处理后的 GH5188 超合金从 473 K 到 1473 K 的发射率值与温度变化成正比，总半球发射率值增加了 0.204。0-60° 的总方向发射率变化不大，但在 60° 时急剧下降。将测量数据与已发表的文献数据进行比较，在相同温度下，SiC 材料 316 L 不锈钢材料的光谱发射率值的最大偏差为 0.044 和 0.022，比较结果显示出令人满意的一致性。通过不确定度分析，结果表明测量装置的综合不确定度小于 2.6%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.