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为便于霍尔推力器羽流在轨诊断测量,文章提出了一种基于光谱诊断衍生出来的图像诊断方法。首先对推力器羽流进行光学图像采集,然后提取出能够反映羽流不同谱段光强信息的红绿蓝三通道数据;同时结合相机成像原理分析,得到不同通道的像素点灰度值与羽流光谱强度的对应关系;并且基于光谱碰撞辐射模型,建立了羽流图像计算模型。研究结果表明,利用图像诊断方法计算得到的羽流区电子温度和离子密度分布规律均与探针试验结果相吻合,计算的相对不确定度分别约为20%和15%,说明了该诊断方法精度适中,具有较高的可靠性,适用于在轨诊断霍尔推力器羽流等离子体参数。
In order to facilitate the Hall thruster plume in-orbit diagnostic measurement, the article presents a method based on spectral diagnosis derived from the image diagnosis. Firstly, the optical image of the thruster plume is collected, then the red, green and blue data of three channels which can reflect the light intensity information of different plume sections are extracted. At the same time, the pixel gray value and plume spectrum of different channels are obtained by analyzing the camera imaging principle. Intensity correspondence; and based on spectral collision radiation model, established a plume image computing model. The results show that the distribution of electron temperature and ion density in plume area calculated by image diagnostic method are consistent with the experimental results of the probe, and the relative uncertainties calculated are about 20% and 15%, respectively, indicating that the diagnostic method Accurate accuracy, with high reliability, suitable for in-orbit diagnosis Hall thruster plume plasma parameters.