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建立了填充半透明液体光学腔光谱透射比的正问题计算模型,提出了一种基于填充液体光学腔的透射光谱反演其液态介质光学常数的IDTM模型,通过测量填充水光学腔的透射光谱并反演水的光学常数进行了模型验证.采用Bruke V70傅里叶红外光谱仪实验测量了填充RP-3航空煤油光学腔在波长2~15μm的透射光谱,基于新模型反演得到RP-3航空煤油光学常数,进而计算得到了其部分波段区域热辐射物性参数.研究结果表明:1)IDTM模型反演液体光学常数精度同MCDTM模型基本一致,且明显高于SODTM模型和SDTM模型.2)RP-3航空煤油在波长2~15μm范围透光性能较差,其中存在2.4μm、3.4μm、6.9μm、7.3μm和13.8μm等5个强吸收区域.3)RP-3航空煤油的光学常数和热辐射物性参数光谱选择性很强,在不同波段其值差距较大.
A positive model for calculating the spectral transmittance of a translucent liquid optical cavity was established. An IDTM model was proposed based on the transmissivity spectrum of a liquid-filled optical cavity, which was used to retrieve the optical constants of the liquid medium. The optical constants of inversion water were validated by the model.The transmission spectra of the RP-3 kerosene cavity were measured by using a Bruker V70 FT-IR spectrometer at a wavelength of 2 ~ 15μm. Based on the new model, RP-3 aviation kerosene Optical constants and some parameters of thermal radiation in some wavebands are calculated.The results show that: 1) The accuracy of liquid optical constants of IDTM model inversion is basically the same as that of MCDTM model and significantly higher than that of SODTM model and SDTM model.2) RP- 3 Aviation kerosene has poor light transmission performance in the wavelength range of 2 ~ 15μm, among which there are 5 strong absorption areas of 2.4μm, 3.4μm, 6.9μm, 7.3μm and 13.8μm.3) The optical constants and heat of RP-3 aviation kerosene The spectral parameters of the radiation properties are very strong, and the values of the radiation parameters are quite different in different wavelength bands.