Most of the traditional infrared remote sensing systems are single-band imaging with wide spectral range, which cannot adapt to the variability of background and target characteristics in point target detection. The full-link model of point target detection by space-based infrared sensor is constructed, the target, background, atmosphere, sensor spectral response, space response, radiation response, noise characteristics and other factors are comprehensively considered. A band optimization method based on detection signal to noise ratio is proposed. With the cloud and sea background as the typical background, three narrow bands are selected in the short-wave, medium-wave and long-wave ranges, respectively.
Improved Grouping strategies for spectral subintervals of multi-scale multi-group full-spectrum k-distribution models have been done by considering the influences of both temperature and participating species mole ratio variations on correlated-k characteristics of the spectra of gas mixtures. Finally, evaluations are presented on the calculation of thermal images of supersonic hot jets exhausted from a Chevron ejecting nozzle under a 3–5-micron wave band.
For the ground combustion process of MTV grain, the flow field distribution of combustion products was simulated based on the set combustion boundary conditions. The combustion product is a two-phase flow of particles and gases, which is accompanied by the chemical reaction of C particles with oxygen to produce CO2 gas. Based on the results of the flow field, the infrared radiation spectra at different positions above the grain are calculated. The calculated results show that the radiation contribution of particles and gases in the flow field is close, and the radiation spectrum of the combustion product flow field is formed together. The radiation above the grain decays rapidly with the increase of distance.
Contains H2, CO and unburned components of high-temperature plume of rocket engine, then injected into the atmosphere, continue to carry out the oxidation reaction in the plume near field region with the volume in the plume of oxygen in the air, two times burning. The afterburning is an important cause of infrared radiation intensification of propellant plume, which increases the temperature of the flame and changes the components of the gas, thus enhancing the infrared radiation intensity of the flame. [1]. Two the combustion numerical using chemical reaction mechanism involving HO2 intermediate reaction, the study confirmed that HO2 is a key intermediate, plays a decisive role to trigger early response, on afterburning temperature and flow concentration distribution effect. A finite rate chemical reaction model is used to describe the two burning phenomenon in high temperature plume[2]. In this paper, a numerical simulation of the flame flow field and radiative transfer is carried out for the afterburning phenomenon. The effects of afterburning on the composition, temperature and infrared radiation of the plume are obtained by comparison.
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