太赫兹科学与电子信息学报2026，Vol.24Issue(5)：611-623,13.DOI:10.11805/TKYDA2025353
瑞利-琼斯近似在太赫兹波段的适用性探讨
Discussion on the applicability of Rayleigh-Jeans approximation at the terahertz band
摘要
Abstract
Addressing the error issues associated with the Rayleigh-Jeans approximation when applied in the millimeter-wave high-frequency band and terahertz band,this paper theoretically analyzes the propagation of approximation errors and derives a second-order linear approximation formula.The calculation results indicate that the second-order approximation exhibits smaller approximation deviations in the millimeter-wave and terahertz bands,with errors less than 1%in frequency bands below 2 THz,representing an accuracy improvement of 1 to 2 orders of magnitude compared to the Rayleigh-Jeans approximation.Analysis of multiple typical scenarios reveals that,from the perspective of bright temperature observation,the two approximation results are equivalent,but there are fundamental differences in the proportion of energy contribution,particularly under conditions of low emissivity(<0.3)and low temperature(<100 K),where the Rayleigh-Jeans approximation error is significant.The research results can provide reference for studies on terahertz radiation calculation models,radiometer calibration,and target and environmental radiation characteristics.关键词
太赫兹/瑞利琼斯近似/辐射测量/二阶近似Key words
terahertz/Rayleigh-Jeans approximation/radiation measurement/second-order approximation分类
数理科学引用本文复制引用
苏金龙,李升然,李进春..瑞利-琼斯近似在太赫兹波段的适用性探讨[J].太赫兹科学与电子信息学报,2026,24(5):611-623,13.基金项目
国家自然科学基金资助项目(62571207) （62571207）
