Reserch on the test method of solar stray light suppression ability of heliospheric imager
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摘要:
为了对日球成像仪太阳杂光抑制能力进行定量化的评价，开展了日球成像仪太阳杂光抑制能力的测试方法研究和实验验证。提出了一种通过将前端光阑与相机分段测试进而实现在实验室条件下测试日球成像仪太阳杂光抑制能力的方法，避免了真空测试环境下空间受限带来的结构散射误差进而影响测试精度的问题。利用该方法在实验室条件下对一台日球成像仪太阳杂光抑制能力进行了测试，测试结果表明：日球成像仪整机的PST在WACH1相机处为1.4×10−8，在WACH2处为4.3×10−9。对测试结果进行了误差分析，其中随机误差为21.6%，系统误差导致WACH1处PST测试误差为1.1×10−8，在WACH2处为4.2×10−9，测试精度满足高杂光抑制比的日球成像仪测试要求，证明了该测试方法的可行性和准确性。本文的研究为日球成像仪太阳杂光抑制能力的测试提供了一种新的途径。
Abstract:In order to quantitatively assess the solar stray light suppression capability of the heliospheric imager, a testing approach and experimental validation of the solar stray light suppression capability of the heliospheric imager were investigated. In this paper, we propose a method to test the solar stray light suppression capability of the heliospheric imager under laboratory circumstances by conducting segmented tests of the front-end baffle and the camera. This approach circumvented the issue that the structural scattering caused by the test under vacuum conditions would be overly large and influence the accuracy of the test results. The proposed method was then employed to assess the effectiveness of a heliospheric imager in suppressing solar stray light under laboratory conditions. The experimental results indicated that the PST of the heliospheric imager was 1.4×10−8 at WACH1 and 4.3×10−9 at WACH2. The error analysis of the test results revealed that the random error was 21.6%, and the PST resulting from the sum of system errors was 1.1×10−8 at WACH1 and 4.2×10−9 at WACH2. The test accuracy met the requirements, demonstrating the feasibility and accuracy of the test method. The study presented in this paper offers a novel means to test the solar stray light suppression capability of heliospheric imager.
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Key words:
- Heliospheric imager /
- stray light test /
- error analysis
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图 1 本文所测试的日球层成像仪示意图，本文所测试的日球层成像仪示意图，其中蓝色箭头所指角度均为相机视场边缘或视场中心与太阳光线的夹角，WACH1全视场角为20°，WACH2全视场角为40°
Figure 1. Schematic diagram of the heliospheric imager tested in this paper. The angles indicated by the blue arrows in the figure are the angles between the edge of the camera's field of view or the center of the field of view and the sun's rays. The WACH1 full field of view is 20°, and the WACH2 full field of view is 40°
图 2 (a)前端光阑杂光测试系统的组成与工作原理及(b)测试装置实物图
Figure 2. (a) Composition and working principle of the front-end diaphragm stray light test system and (b) physical diagram of the test device
图 6 日球相机镜头WACH2杂光抑制能力测试结果
Figure 6. Test results of WACH2 stray light suppression capability of heliosphere camera lens
图 7 主要结构散射传播路径和空气粒子散射路径
Figure 7. Scattering propagation paths of the main structure and air particle
图 8 两表面替换前后的测试结果对比
Figure 8. Comparison of test results before and after replacement of two surfaces
图 9 测试范围1和范围2的示意图，由图可知在同一圆环范围内区域成旋转对称关系，其Mie散射数值应当相等
Figure 9. Diagram of test scope 1 and scope 2. It can be seen from the figure that the Mie scattering values should be equal in the regions with rotationally symmetry within the same ring.
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