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在空间离子探测过程中,太阳紫外光也会进入探测器产生光污染信号。为了考察它对离子探测的影响,搭建了一套模拟太阳紫外光污染的地面测试系统,并对自主研制的空间低能离子探测器原理样机进行了紫外响应测试。实验结果表明:沿水平方向进入分析器的紫外光响应可以忽略,而以一定倾斜角进入分析器的紫外光响应计数率约为102～103s-1。根据测试结果,估算出探测器对太阳紫外光的抑制率约为10-8,分析了紫外光污染对探测空间低能离子如质子和α粒子的影响。对于质子,由于其通量大,紫外光的影响不大。而对于通量较小的α粒子,紫外光的影响较大,需要进一步采取有效措施进行抑制。此外,本测试系统可以推广到其它空间粒子探测器的太阳紫外光污染的地面模拟测试。
In the space ion detection process, the sun’s ultraviolet light will enter the detector to produce light pollution signals. In order to investigate its influence on ion detection, a set of ground testing system to simulate solar ultraviolet light pollution was set up. The UV response of the self-developed space low energy ion detector prototype was tested. The experimental results show that the UV response entering the analyzer along the horizontal direction is negligible, while the UV response count rate entering the analyzer at a certain tilt angle is about 102 ~ 103s-1. Based on the test results, we estimate that the detector has a UV-blocking rate of about 10-8. The effects of UV-light on the detection of low-energy ions such as protons and a-particles are analyzed. For protons, due to its large flux, UV has little effect. For the smaller flux of α particles, the greater the impact of ultraviolet light, the need for further effective measures to suppress. In addition, the test system can be extended to simulate ground-based solar pollution of other space particle detectors.