计量学报2025，Vol.46Issue(3)：361-367,7.DOI:10.3969/j.issn.1000-1158.2025.03.08
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
摘要
Abstract
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 pre-oxidation 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Key words
infrared temperature measurement/emissivity testing/pre-oxidation/emissivity correction/emissivity consistency/uncertainty引用本文复制引用
袁泽滨,侯德鑫,翁晟皓,丁炯..合金红外测温发射率修正及不确定度分析[J].计量学报,2025,46(3):361-367,7.基金项目
国家自然科学基金(22127802) （22127802）
