Flame Temperature Remote Measurement from Infrared Emission Line Intensities of Rotation-Vibration Band of Molecules

A theoretical investigation and method of temperature remote sensing determination from the infrared emission line intensities in the fine structure of the rotation—vibration band of the molecules are performed. We have applied the method to some flames that thier combustions are unstationary, short time and violent. The temperature obtained by this method is good agreement with modified sodium line reversal method data. Our results show that the IR emission remote sensing method is a very sensitive, rapid and accurate measured temperature technique.     

Remote Fourier Transform Infrared Emission Spectroscopy in the Studies of the Solid Propellant Combustions

In this paper infrared emission spectra of the solid propellant combustion using remote Fourier transform spectroscopy have been studied. Both the infrared spectral radiance distributions and gas quantitative method for solid propellant combustions by remote Fourier transform infrared emission spectroscopy have been presented. In the method we utilize estimating temperature measuring models, which are modified by Junde Wang, based on emission fundamental band measurements of HCl or HF. Through measuring the temperature both the infrared spectral radiance distributions of the solid propellant combustions and their emisivities can be obtained. A remote measured gas concentration model based on combustion temperature, spectral radiance and emissivity has been developed. Field single-ended measurements at long distances for solid propellant plumes at temperature 1700—3500K can be extended to measuring fluctuations of instantaneous temperature and combustion reaction products.     

Study on Infrared Spectral Radiance by Remote Fourier Transform Infrared Spectroscopy

Abstract

Infrared emission spectra emitted by high luminosity infrared pyrotechnics have been observed remotely using the Fourier transform infrared spectroscopy. The primary purpose of the study is to determine infrared spectral radiance distribution, their time—resolved spectra and integrated emission energy. The spectra have been recorded between 4000 – 800cm^?1 region with spectral resolution of 4cm^?1. The study is very important for many applications.     

The Influence of the Temperature of Blackbody for Calibrating FTIR System on the Instrument Response Function∗

The instrument response function of Fourier transform infrared spectrometer is a very important parameter in infrared emission Spectroscopy to obtain infrared spectral radiance distribution of the desired sample, the concentrations of the components of combustion products in the flame etc. This paper gives the effect of the temperature of the standard blackbody for calibrating Fourier transform infrared spectrometer on the instrument response function. The result illustrates that the values of the instrument response functions decrease as the blackbody temperature increased, and tends to a limit. The paper points out that the condition must be observed for using instrument response function correctly.

     

Measurement of Rotational Temperature by Simulated Molecular Spectra

The measurement of temperature of heavy particles in a thermal plasma is based on the comparison of experimental rotational spectrum obtained by optical emission Spectroscopy and synthetic spectra calculated for different temperatures. The calculation principle of the synthetic spectra is detailed as well as the temperature accuracy obtained. This method is used to measure the temperature of an Ar-CO₂ mixture plasma produced in a wall stabilized arc with molecular spectra of C₂ (Swan system) and CN (violet system).     

基于分子转-振光谱精细结构的火焰温度遥测方法

燃烧火焰温度是固体推进剂等重要参数,本文研究了基于分子转-振光谱精细结构的火焰温度遥测方法.根据分子转-振光谱线的展宽机制,研究了分子谱线线型.结合朗伯-比耳吸收定律,去除谱线中心受大气低温气体吸收影响较大的数据点后,利用谱线两翼的数据点进行谱线线型拟合,利用分子转-振光谱精细结构温度遥测方法将经拟合修正后数据反演火焰...