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摘要: 为了实现对光学系统杂散光抑制能力的定量评价，开展了10−9量级高灵敏度点源透射比测试设备的研究和实验验证。采用脉冲光源、脉冲探测的新测量方法，在保证测试系统具有高灵敏度测量能力的同时，简化了微弱光电信号探测组件的复杂程度，建立了一套最大测试口径为600 mm、测试波长为527 nm的点源透射比测试设备，并利用该设备测试了一台250 mm口径空间光学相机的点源透射比。实验结果表明：60°入射角度时的点源透射比测试结果为1.68×10−9。证明该设备的测试误差在10−9或更低的量级，具备10−9量级高灵敏度点源透射比测试能力。本文研究可以为天文望远镜、星敏感器、空间目标监视载荷等多种类型的光学仪器提供杂光抑制性能评估。Abstract: In order to achieve the quantitative evaluation of the stray light attenuation in optical systems, we demonstrated a point source transmission test facility with 10−9-order sensitivity in this paper. We employed a pulsed source and measured the pulse to obtain the weak signal at the image plane, as well as to simplify the detection system. Using this scheme, we constructed a test facility with a maximum aperture of 600 mm and a test wavelength of 527 nm, and conducted the test with a 250 mm aperture optical system. Experimental results showed that the point transmission at a 60-degree incident angle is 1.68×10−9. The results prove that the test error of this facility is in the order of 10−9 or below, and the test facility has the ability to test 10−9-order point source transmissions. This technology can provide quantitative evaluation for various optical systems with strict stray light requirements, like astronomical telescopes, star sensors and spaced target monitor payloads.
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Key words:
- point source transmission /
- stray light test /
- weak signal detection
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表 1 PST测试能力极限理论计算结果
Table 1. Theoretical analysis results of the PST detection limit
入射角度θ PST测试能力极限 30° 6.2×10−11 40° 7.0×10−11 50° 8.3×10−11 60° 1.1×10−10 70° 1.6×10−10 
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表 2 入光口信号测量值
Table 2. Signal voltages at different positions of the input plane
编号 信号测量值/mV 1 1600 2 2060 3 2120 4 1450 5 1880 6 1800 平均值 1818
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表 3 距中心视场40°像面信号测量值
Table 3. Detected signal voltages at the image plane at the 40° off-axis angle
(mV) 水平位置1 水平位置2 水平位置3 水平位置4 水平位置5 垂直位置1 580 620 660 660 660 垂直位置2 550 590 630 630 650 垂直位置3 530 570 590 590 620 垂直位置4 490 530 530 530 600 平均值 590.5
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表 4 距中心视场50°像面信号测量值
Table 4. Detected signal voltages at the image plane at the 50° off-axis angle
(mV) 水平位置1 水平位置2 水平位置3 水平位置4 水平位置5 垂直位置1 310 330 350 380 370 垂直位置2 330 330 350 380 360 垂直位置3 310 330 350 370 360 垂直位置4 300 340 340 360 360 平均值 345.5
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表 5 距中心视场60°像面信号测量值
Table 5. Detected signal voltages at the image plane at the 60° off-axis angle
(mV) 水平位置1 水平位置2 水平位置3 水平位置4 水平位置5 垂直位置1 210 220 230 250 240 垂直位置2 210 210 230 240 240 垂直位置3 210 220 220 230 230 垂直位置4 190 200 210 230 220 平均值 222
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表 6 待测系统不同角度下的PST值
Table 6. PSTs at different incident angles of the test subject
测试角度 PST 40° 4.48×10−9 50° 2.62×10−9 60° 1.68×10−9
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