合金红外测温发射率修正及不确定度分析  

Emissivity Correction and Uncertainty Analysis of Alloy Infrared Temperature Measurement

作　　者：袁泽滨 侯德鑫[1] 翁晟皓 丁炯[1] YUAN Zebin;HOU Dexin;WENG Shenghao;DING Jiong(College of Metrology&Measurement Engineering,China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中国计量大学计量测试与仪器学院,浙江杭州310018

出　　处：《计量学报》2025年第3期361-367,共7页Acta Metrologica Sinica

基　　金：国家自然科学基金(22127802)。

摘　　要：金属发射率低且样品间一致性差是红外测温的主要误差来源,需针对应用场景准确测量发射率,并实验评估其一致性,以确保发射率修正后测温不确定性满足应用要求。针对碳氢燃料吸热性能研究中的GH3128合金管道红外测温,研究基于锥形腔样品的宽温度区间发射率测试方法,提出通过预氧化提高金属样品间发射率一致性并探索相关工艺参数。采用4个样品,实验6处测量区域和10种氧化时间,在2种不同波长下评估200~900℃温度区间发射率,结果表明在900℃均温环境下自然氧化18 h后,发射率相对标准差可达到0.01以下。对样品发射率一致性、参考腔发射率、样品温度均匀性等关键不确定度来源进行评估,最终合成标准不确定度为0.016,引起的测温不确定度小于0.8%,可满足应用需求。提出的预氧化处理、发射率测试方法和不确定度评估框架,可为其它需要对金属进行准确红外测温的应用提供参考。The low emissivity of metals and poor consistency between samples are the main sources of error in infrared temperature measurement.To ensure that the uncertainty of temperature measurement after emissivity correction meets the application requirements,it is necessary to accurately measure the emissivity and experimentally evaluate its consistency for specific applications.For the infrared temperature measurement of GH3128 alloy pipelines in the research of endothermic properties of hydrocarbon fuels,a wide temperature range emissivity test method based on conical cavity samples was designed.Proposed to improve the consistency of emissivity between metal samples through pre-oxidation and explore relevant process parameters.Four samples were used,and 6 measurement areas and 10 oxidation times were experimented.The emissivity in the temperature range of 200~900℃at two different wavelengths was evaluated.The results showed that after natural oxidation for 18 hours at 900℃isothermal environment,the relative standard deviation of emissivity could be less than 0.01.The key sources of uncertainty such as sample emissivity consistency,reference cavity emissivity,and sample temperature uniformity were evaluated.The final synthesized standard uncertainty was 0.016,resulting in a temperature measurement uncertainty of less than 0.8%,which could meet application requirements.The preoxidation treatment,emissivity test method,and uncertainty evaluation framework proposed can provide reference for other applications that require accurate infrared temperature measurement of metals.

关 键 词：红外测温 发射率测试 预氧化 发射率修正 发射率一致性 不确定度 

分 类 号：TB942[一般工业技术—计量学]