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| Emissivity Correction and Uncertainty Analysis of Alloy Infrared Temperature Measurement |
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Abstract The low emissivity of metals and poor consistency between samples are the main sources of error in infrared temperature measurement. It is necessary to accurately measure the emissivity and experimentally evaluate its consistency for specific applications to ensure that the uncertainty of temperature measurement after emissivity correction meets the application requirements. 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. Propose 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°C at two different wavelengths was evaluated. The results showed that after natural oxidation for 18 hours at 900°C isothermal environment, the relative standard deviation of emissivity could be less than 0.01. 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 in this paper can provide reference for other applications that require accurate infrared temperature measurement of metals.
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Received: 08 December 2023
Published: 19 March 2025
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WEN Zhiqiang, YUN Enxue, SUN Siyu, YANG Tenghui, WANG Bisong, WANG Leigang, LUO Xin, XU Jin, SUN Bingfeng, LI Wenbing, HAO Qiang. A Power Stabilized Low Noise Frequency Synthesizer for CPT Atomic Clocks[J]. Acta Metrologica Sinica, 2025, 46(2): 267-273. |
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2025, Vol. 46 
