一维法拉第探针阵列束流发散角测量试验研究

Experiment of Beam Divergence Angle Measurement for Electric Propulsion by 1-Dimension Faraday Probe Array

研制了用于空间电推进束流发散角测量的一维法拉第探针阵列(FPA),在LIPS-200离子推力器上进行了固定截面和多截面的束流发散角测量试验。试验结果表明:固定截面下一维FPA测量的束流发散角为26.74°±0.04°(置信度P=95.45%),该测量结果与米字型FPA测量的结果(27.07°±0.18°,P=95.45%)的相对误差为1.2%,其合成标准不确定度仅为米字型FPA测量合成不确定度的22.2%。多截面下一维FPA测量的束流发散角为26.54°±0.56°(P=95.45%),该测量结果与固定截面下的测量结果的相对误差只有0.8%,表明多截面下一维FPA测量束流发散角技术是可信的。与传统的米字型FPA相比,一维FPA具有体积小、质量轻、空间分辨率高和动态扫描范围大等特点,同时还可以与推力测量设备集成,降低试验成本。

1-dimension Faraday Probe Array(FPA)applied to beam divergence angle measurement for electric propulsion was developed,and the experiments of beam divergence angle measurement under fixed cross-section and multi cross-section were performed on LIPS-200 electric propulsion.The test results have shown that the beam divergence angle measured with 1-dimension FPA under fixed cross-section is 26.74°±0.04°(P=95.45%),and the error of this result relative to the result of 27.07°±0.18°(P=95.45%)measured with star-shaped FPA is 1.2%,and the combined standard uncertainty is only 22.2%of that measured with star-shaped FPA.Under multi cross-section,the beam divergence angle measured with 1-dimension FPA is 26.54°±0.56°(P=95.45%),the error of this result relative to the result measured under fixed cross-section is 0.8%,which indicate that the beam divergence angle measuring technique with multi cross-section by 1-dimension FPA is credible.Comparing with star-shaped FPA,1-dimension FPA has advantages of small size,light weight,high spatial resolution and large dynamic scanning range,but also can reduce the experimental cost by integrated with the thrust-measuring equipment..