二氧化碳气体高温红外辐射的测量与研究

Measurement and Study of High Temperature Infrared Radiation of CO_2

在高频等离子体风洞中建立了高温二氧化碳流场,通过测量和计算获得了温度和摩尔比数分布,同时进行了红外光谱测量实验。给出了测量实验装置、原理及方法,并在1500K^3000K范围内四个不同的温度环境下进行实验,获得了二氧化碳在不同温度下4.3 μm附近v_3振动带的红外光谱数据。发现随着温度的升高,光谱曲线的最高峰位置向长波方向移动。通过理论分析得到了高温下二氧化碳气体红外辐射实验测量中出现"红移"现象的理论原因,以及与天体物理中红移现象的区别。该理论可应用于高温气体温度测量。

A high temperature CO2 flow field was set up in a high frequency plasma wind tunnel.The profiles of temperature and mole fraction were obtained through measurement and calculation.At the same time,infrared spectrum measurement experiment was carried out.The equipment,principle and method used in the experiment were given.Experiment was made under four different temperature conditions between 1500 K and 3000 K.The infrared spectral data of v3 vibration band of CO2 near 4.3 μm at different temperatures were acquired.It was found that the peak position of the spectral curve moved in the direction of long wavelength as temperature increased.Through theoretical analysis,the reason about the ＂red shift＂ occurred in the measurement of infrared radiation of CO2 at high temperature and its difference from the red shift in astrophysics were obtained.This theory could be used in the measurement of high temperature gas.