基于距离修正的小目标中波红外光谱辐射测温方法

Temperature Measurement Method for Small Target Medium-Wave Infrared Spectral Radiation Based on Distance Correction

对高速运动的远距离空间目标而言,温度是表征其工作状态与性能的重要参数之一。准确获取目标的温度对判别其运动状态和预测其态势发展等具有重要的参考价值。目前常用的面目标或点目标的处理方法,在小目标的辐射特性测量中将不再适用,而光谱探测增加了目标在波长维度的可分辨信息,可以准确获取目标能量随波长的分布情况,为目标温度的反演提供了可能,极具应用潜力。无狭缝光谱仪可以降低对空间目标的跟踪和稳定精度的要求,具有结构简单、帧频高和响应速度快等特点,在天文观测和航天器观测等方面具有较高的应用价值。对目标红外辐射特性测量的光谱定标模型进行了分析,确定了红外探测器像元线性响应模型中的主要参数。为了减小成像距离对测温精度的影响,提出了一种基于距离修正的目标温度反演模型,提高了测温精度,符合实际工程实践应用中的精度需求,对红外辐射光谱测温具有一定的指导意义。

For long-distance space targets moving at high speeds,temperature is one of the important parameters to characterize their working state and performance.Accurately obtaining the temperature of the target has an important reference value for judging its motion state and predicting its situation development.At present,the commonly used processing method of surface target or point target is no longer applicable to the measurement of the radiation characteristics of small targets.At the same time,spectral detection increases the distinguishable information of the target in the wavelength dimension,which can accurately obtain the distribution of the target energy with wavelength,providing a possibility for the inversion of the target temperature,and has great application potential.The slitless spectrometer can reduce the requirements for tracking and stabilization accuracy of space targets,has the characteristics of simple structure,high frame rate and fast response speed,and has high application value in astronomical observation and spacecraft observation.In this paper,we analyzed the spectral calibration model of target infrared radiation characteristic measurement and determined the main parameters in the linear response model of infrared detector pixels.In order to reduce the influence of imaging distance on temperature measurement accuracy,we proposed a target temperature inversion model based on distance correction.The improved temperature measurement accuracy meets the accuracy requirements in practical engineering applications and greatly affects infrared radiation spectrum temperature measurement.Certain guiding significance.