Two innovative experimental techniques for measuring the high temperature near infrared optical spectra of glass melts are compared. The critical experimental features of both techniques, one based on transmission and the other based on emittance measurements, are reviewed. Typical results of both techniques, including high temperature spectra and values for the Rosseland mean absorption coefficient and thermal radiation conductivity versus temperature for similar glass melts, are compared. The study is focused on sulfate fined soda lime silicate glass melts colored with iron oxide and chromium oxide and on the effect of the glass redox state on the thermal radiation conductivity. It is shown that essentially different measuring principles provide consistent results for similar glass melt types, that is, colors. Using the high temperature spectra of a large variety of (colored) glasses, a new semi‐empirical model is developed for predicting the Rosseland radiation conductivity of arbitrary sulfate fined soda lime silicate glass melts, colored with iron oxide and chromium oxide. By separating the effects of (a) the temperature‐dependent redox state, (b) the high temperature changes in ligand field strengths and (c) the glass matrix, the model reliably predicts the Rosseland radiation conductivity, with a chemical analysis of the glass as input only.

中文翻译：

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玻璃熔体的高温光谱表征和热辐射传导模型

比较了两种用于测量玻璃熔体高温近红外光谱的创新实验技术。审查了两种技术的关键实验特征，一种基于透射，另一种基于发射率测量。比较了两种技术的典型结果，包括高温光谱以及类似玻璃熔体的Rosseland平均吸收系数和热导率与温度的关系值。该研究集中于用氧化铁和氧化铬着色的硫酸盐细钠钙硅酸盐玻璃熔体，以及玻璃氧化还原态对热辐射传导率的影响。结果表明，对于类似的玻璃熔体类型（即颜色），本质上不同的测量原理可提供一致的结果。利用多种（有色）玻璃的高温光谱，开发了一种新的半经验模型，用于预测用氧化铁和氧化铬着色的任意硫酸盐细化的钠钙硅酸盐玻璃熔体的Rosseland辐射电导率。通过分离（a）温度依赖的氧化还原状态，（b）配体场强的高温变化和（c）玻璃基质的影响，该模型通过玻璃的化学分析可靠地预测了Rosseland辐射传导率仅作为输入。